UtilityBaseCalculators
Calculators here answer the questions you actually type into a search bar: what is 15% of a number, what did a price change by, and what height matches a 16:9 width. Each calculator shows its result instantly as you type and explains what it computed.
Mortgage Calculator
Monthly payment with taxes, insurance, PMI, and a full amortization schedule.
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Scientific Calculator
Full scientific calculator, trig, logs, powers, factorials, with keyboard input.
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Paycheck Calculator
2026 take-home pay: real IRS brackets, FICA, and your state, computed on your device.
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Currency Converter
Convert 31 currencies at official ECB rates, with a 30-day trend line.
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Fahrenheit to Celsius
Convert °F to °C and back instantly, with the formula and a common-temperatures table.
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Unit Converter
Convert length, weight, temperature, volume, speed, and data units instantly.
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Ovulation Calculator
Fertile window and ovulation estimate on a 3-month calendar, computed on your device.
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Final Grade Calculator
Find out exactly what you need on the final exam to hit your target grade.
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Loan Calculator
Monthly payment, total interest, and payoff schedule, with extra-payment math.
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Calorie Calculator (TDEE)
Daily calorie needs from the Mifflin-St Jeor equation, with macro targets.
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BMR Calculator
Your basal metabolic rate by Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle.
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Date Calculator
Add or subtract days, weeks, months, or years, with a business-days mode.
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Age Calculator
Calculate exact age in years, months, and days, plus your next birthday.
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Compound Interest Calculator
Watch savings grow: starting amount, monthly contributions, and time, visualized.
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Due Date Calculator
Estimated due date from LMP, conception, or IVF transfer, with trimester dates.
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Car Loan Calculator
Monthly car payment with sales tax, trade-in, fees, and total interest.
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Hours Calculator
Hours between two times, with break deduction, overnight shifts, and decimal hours.
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TDEE Calculator
Your total daily calorie burn, plus maintain, cut, and lean-bulk targets.
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Percentage Calculator
What is X% of Y, percentage change, and 'X is what % of Y', solved live.
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BMI Calculator
Calculate your BMI in metric or imperial, with the healthy range for your height.
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Grade Calculator
Weighted grade from syllabus categories, homework, quizzes, exams, with letter grade.
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Macro Calculator
Daily protein, carbs, and fat targets from the Mifflin-St Jeor equation and your goal.
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GPA Calculator
Calculate your GPA on the 4.0 scale from letter grades and credits.
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Graphing Calculator
Plot up to four functions with pan, zoom, and clean asymptotes, no eval, no app.
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Salary to Hourly Converter
Convert salary to hourly and back, with weekly, biweekly, and monthly views.
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Discount Calculator
Sale prices, percent off, stacked discounts, and reverse 'what % is this?' math.
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CM to Feet Converter
Convert centimeters to feet and inches (and back), ideal for height.
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Interactive Periodic Table
A clickable periodic table of all 118 elements, search, filter by category, and see details.
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Date Duration Calculator
Count days until a date, or the exact time between any two dates.
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Fraction Calculator
Add, subtract, multiply, and divide fractions, with the steps written out.
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Square Footage Calculator
Area of rooms and spaces, rectangles, circles, triangles, L-shapes, with cost estimates.
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Period Calculator
Your next six periods predicted, plus honest 'am I late?' math. Nothing stored.
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Standard Deviation Calculator
Sample or population SD with every step shown, mean, deviations, variance, root.
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Concrete Calculator
Cubic yards and bag counts for slabs, footings, and columns, with waste margin.
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Calorie Deficit Calculator
Daily calorie target, weekly pace, and goal date, with honest safety floors.
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Derivative Calculator
Symbolic derivatives up to third order, simplified, with evaluation at a point.
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Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly, with a common-values reference table.
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Sleep Cycle Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles.
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Tip Calculator
Calculate the tip and split the bill, with clean per-person rounding.
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eDPI & Sensitivity Converter
Calculate eDPI and cm/360, and convert mouse sens between CS2, Valorant & more.
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Body Fat Calculator
US Navy circumference method, body fat % from tape measurements.
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Cooking Converter
Cups to grams and back, per ingredient, flour, sugar, butter, and 25 more.
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Days Until Calculator
Live countdown to any date, days, hours, minutes, seconds, and weekends left.
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Time Calculator
Add and subtract hours and minutes, or shift a clock time, with decimal hours.
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Percentage Increase Calculator
The percent change between two numbers, with the formula shown, traps explained.
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Crypto Converter
Live prices for BTC, ETH, and 6 more, converted to 6 fiat currencies.
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Cubic Yard Calculator
Mulch, soil, gravel, or concrete volume, with weight and bag equivalents.
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Time Card Calculator
Weekly timesheet: clock in/out per day, breaks, overtime, and gross pay.
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Ideal Weight Calculator
Devine, Robinson, Miller, and Hamwi estimates on the healthy BMI range for your height.
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Moon Phase Calculator
Tonight's moon or any date's, rendered phase, illumination, next full and new.
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Matrix Calculator
Add, multiply, invert, transpose, and take determinants, up to 4×4.
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Bra Size Calculator
Band and cup from two measurements, modern method, with sister sizes.
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Cups to mL Converter
Convert cups to milliliters and back, for recipes, using the US cup.
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Shoe Size Converter
Convert between US Men's, Women's, UK, EU, and CM sizes, with GS equivalents.
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One Rep Max Calculator
Estimate your 1RM from any hard set, with a full training percentage table.
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Statistics Calculator
Paste numbers, get every descriptive stat plus a histogram, homework-complete.
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Sensitivity Converter
Convert mouse sensitivity between CS2, Valorant, Apex, Overwatch, and more.
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Inflation Calculator
What a dollar amount from any year since 1913 is worth in any other year.
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Tile Calculator
How many tiles and boxes you need, with the waste factor done right.
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Fuel Cost Calculator
What a trip costs in gas, MPG or L/100km, round trip, and per-person splits.
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ROI Calculator
Return on investment, total, profit, multiple, and the annualized rate that matters.
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Probability Calculator
Single events, two independent events, and exact nCr/nPr counting.
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Sunrise & Sunset Calculator
Sunrise, sunset, dawn, dusk, and day length for any place and date.
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Distance Calculator
Straight-line distance between any two places, miles, km, and flight time.
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Calories Burned Calculator
Estimate calories burned for any activity from your weight, duration, and intensity using MET values.
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eBay Fee Calculator
Calculate eBay final value fees and your true net profit, with the fee breakdown line by line.
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Geometry Calculator
Find area, perimeter, surface area, and volume for circles, triangles, cylinders, spheres, and more.
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Reseller Fee Calculator
eBay, StockX, GOAT & Mercari fees → real profit, margin, and ROI per flip.
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Running Pace Calculator
Pace per mile/km, speed, and race finish times from any distance and time.
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Mulch Calculator
Cubic yards and bags of mulch for any bed, at the right depth.
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Quadratic Formula Calculator
Solve ax² + bx + c = 0 with the full step-by-step work shown, free, no paywall.
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Margin Calculator
Profit margin vs markup done right, and the price for any target margin.
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Slope Calculator
Slope, equation, distance, and midpoint from two points, with the line graphed.
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Pythagorean Theorem Calculator
Solve any right triangle from two values, get the missing side, both angles, area, and a labeled diagram.
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Pounds to Kilograms Converter
Convert pounds (lb) to kilograms (kg) instantly, both ways, with a quick reference table.
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Inches to Centimeters Converter
Convert inches to centimeters instantly, both ways, with a quick reference table.
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Budget Calculator (50/30/20)
Split your take-home pay into needs, wants, and savings, with adjustable ratios.
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Sales Tax Calculator
Add sales tax to a price or back it out of a total, with state base rates.
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Gravel Calculator
Gravel in cubic yards and tons for paths, pads, and driveways.
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VAT Calculator
Add VAT to net prices or extract it from gross, with country rate presets.
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Overtime Calculator
Time-and-a-half math for your week, gross pay, OT premium, effective rate.
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Zodiac Sign Calculator
Western sign and Chinese animal from a birth date, cusps handled honestly.
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EZ Grader
Grade a test by the number wrong, get the percentage, letter grade, and a full grade chart.
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Miles to Kilometers Converter
Convert miles to kilometers instantly, both ways, with running and driving references.
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Paint Calculator
How many gallons a room needs, walls, coats, doors and windows accounted for.
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Military Time Converter
Convert between 24-hour and 12-hour time, live, with the full chart.
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BTU Calculator
What size air conditioner a room needs, in BTU and tons, honestly sized.
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Ratio Calculator
Solve a:b = c:x by cross-multiplying, or simplify any ratio, work shown.
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Stair Calculator
Riser count, riser height, run, and stringer length from total rise, code-checked.
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Heat Index Calculator
What the heat feels like, the NWS equation with official danger levels.
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Fraction to Decimal Converter
Convert any fraction to a decimal with step-by-step long division and automatic repeating-decimal detection.
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Poshmark Fee Calculator
See Poshmark's flat or 20% fee and your exact payout and profit on a sale.
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Mercari Fee Calculator
Calculate Mercari's 10% selling fee and your net payout and profit on a sale.
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StockX Fee Calculator
Calculate StockX seller fees by level plus payment processing, and your true payout.
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Feet to Meters Converter
Convert feet to meters instantly, both ways, for height and distances.
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Meters to Feet Converter
Convert meters to feet instantly, both ways, for height and distances.
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Tablespoons to Cups Converter
Convert tablespoons to cups and back, 16 tbsp make a cup.
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mL to Oz Converter
Convert milliliters to US fluid ounces and back, with a reference table.
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Oz to mL Converter
Convert US fluid ounces to milliliters and back, with a reference table.
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Debt Payoff Calculator
Snowball vs avalanche, simulated month by month, payoff time and interest for each.
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Roof Pitch Calculator
Rise-over-12 to angle, slope, and rafter multiplier, with a live triangle.
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Life Expectancy Calculator
US actuarial averages by age and sex, framed honestly, weekends included.
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Ounces to Grams Converter
Convert ounces (oz) to grams (g) instantly, both ways, for cooking and postage.
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Simple Interest Calculator
Calculate simple interest with I = P × r × t, and see the interest and final balance.
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Rent Affordability Calculator
Find how much rent you can afford from your income and debts, using the 30% and 28/36 rules.
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MPH to KM/H Converter
Convert miles per hour to kilometers per hour and back.
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Water Intake Calculator
A daily hydration target from body weight, exercise, and climate.
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Height Calculator
Predict a child's adult height from parents' heights, the pediatrician's formula.
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APY Calculator
Turn an APR and compounding schedule into the yield you actually earn.
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Depop Fee Calculator
Work out Depop's payment processing fee and your net payout, US sellers pay no selling fee.
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Liters to Gallons Converter
Convert liters to US gallons instantly, both ways, for fuel and recipes.
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Grams to Pounds Converter
Convert grams to pounds and back instantly, with a quick-reference table.
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Inches to Feet Converter
Convert inches to feet (decimal) and back, 12 inches per foot.
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Wind Chill Calculator
Feels-like cold from temperature and wind, with official frostbite times.
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Life Path Number Calculator
Find your numerology life path number from your birth date, with the reduction shown step by step.
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Speed, Distance & Time Calculator
Enter any two of speed, distance, and time to solve for the third, with unit options.
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Cap Rate Calculator
Compute capitalization rate from NOI and price, with an expense builder and solve-for-value.
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Pounds to Grams Converter
Convert pounds to grams and back instantly, with a quick-reference table.
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Kg to Stone Converter
Convert kilograms to stone and back, the UK body-weight unit.
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GCF & LCM Calculator
GCF, LCM, and prime factorization, plus a prime-or-composite check for a single number.
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Board Foot Calculator
Hardwood volume in board feet from quarters, width, and length, with cost.
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Molar Mass Calculator
Enter a chemical formula and get its molar mass with a per-element mass breakdown.
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Electricity Cost Calculator
Estimate what a device costs to run from its wattage, hours, and your kWh rate.
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CAGR Calculator
Compute the compound annual growth rate from a start value, end value, and years.
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Cash-on-Cash Return Calculator
Find the annual return on the actual cash you invested in a rental property.
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Kg to Grams Converter
Convert kilograms to grams and back, 1 kg = 1000 g.
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Meters to Yards Converter
Convert meters to yards and back, 1 m ≈ 1.0936 yd.
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Stone to Pounds Converter
Convert stone to pounds and back, 1 stone = 14 pounds.
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Sig Fig Calculator
Count significant figures with every digit explained, and round to any precision.
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Unit Price Calculator
Compare products by price per unit to find the better buy, even across pack sizes.
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Break-Even Calculator
Find the units and revenue you need to break even from fixed costs, price, and variable cost.
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Resistor Color Code Calculator
Decode 4- and 5-band resistor colors to ohms, with a live visual of the bands.
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CM to Inches Converter
Convert centimeters to inches and back. Edit either box, both update.
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KG to LBS Converter
Convert kilograms to pounds and back. Edit either box, both update.
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Betting Odds Converter
Convert between American, decimal, and fractional odds, with implied probability and payout.
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Rental Yield Calculator
Calculate gross and net rental yield from property value, rent, and expenses.
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Dog Age Calculator
Convert your dog's or cat's age to human years, size-adjusted, not the old times-7 myth.
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MM to Inches Converter
Convert millimeters to inches and back. Edit either box, both update.
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KM to Miles Converter
Convert kilometers to miles and back. Edit either box, both update.
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Scale Factor Calculator
Find the scale factor between two sizes, as a decimal, ratio, and percentage.
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Weeks Between Dates Calculator
Count the exact weeks and days between two calendar dates.
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Percentage of a Percentage Calculator
Find a percentage of a percentage, like what is 15% of 20%, with the formula shown.
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Recipe Scaler
Scale a whole recipe up or down by servings, with clean fractions, not ugly decimals.
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Aspect Ratio Calculator
Solve missing dimensions for 16:9, 4:3, and any custom aspect ratio.
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YouTube Money Calculator
Estimate YouTube ad earnings from your monthly views and RPM.
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Gallons to Liters Converter
Convert US gallons to liters and back. Edit either box, both update.
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Grams to Ounces Converter
Convert grams to ounces and back. Edit either box, both update.
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Rounding Calculator
Round a number to the nearest whole, tenth, hundredth, ten, or significant figures.
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Shopify Profit Calculator
Real net profit per order after product, shipping, fees, ads, discounts, and refunds.
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Bill Splitter
Split a bill with tip evenly between any number of people.
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Sales Commission Calculator
Calculate commission earned from sales volume, rate, bonus, and base pay.
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Chronological Age Calculator
Find exact chronological age in years, months, and days, or live down to the second, for reports and assessments.
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Dropshipping Profit Calculator
Net profit per order from supplier cost, shipping, ad spend, fees, and refunds.
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Mbps to MB/s Converter
Convert megabits to megabytes per second, and every other speed unit, instantly.
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PPI Calculator
Find a screen's pixel density (PPI) from its resolution and diagonal size.
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Business Days Calculator
Count the working days between two dates, excluding weekends and holidays.
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Markup to Margin Converter
Convert a markup percentage to gross margin and back, instantly.
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Download Time Calculator
How long a file takes to download at your speed, any size, any unit.
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Break-Even ROAS Calculator
The minimum return on ad spend where a sale stops losing money.
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Game Download Time Calculator
How long a game download takes. Pick a size preset or enter your own.
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Data Usage Calculator
Estimate your monthly internet data from streaming, calls, gaming, and browsing.
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FOV Calculator
Convert horizontal and vertical field of view for any aspect ratio.
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Maximum CPA Calculator
The highest cost per acquisition a product can afford before losing money.
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Upload Time Calculator
How long a file takes to upload at your (usually slower) upload speed.
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Streaming Upload Speed Calculator
The upload speed you need to live stream at a given bitrate, with headroom.
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Discount Profit Calculator
See how a 10%, 20%, or 30% discount really changes profit per order.
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ETS Countdown Calculator
Days until your ETS, separation, or DEROS, with a plain-language breakdown.
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Military Leave Accrual Calculator
Project your leave balance at 2.5 days a month and spot use-or-lose risk.
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Ruck March Pace Calculator
Find your ruck pace per mile and project it to the 12-mile standard.
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Terminal Leave Calculator
Find your last working day: project your leave balance and count it back from your ETS.
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PCS Travel Days Calculator
Authorized travel days for a PCS move: one day per 350 miles.
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Monitor Frame Time Calculator
Convert FPS to frame time in milliseconds and back, with a refresh-rate table.
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Time in Service & Time in Grade Calculator
Work out your TIS and TIG from your PEBD and Date of Rank, plus your next pay gate.
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Military Map Scale Distance Calculator
Convert a distance measured on a map to real ground distance at any scale.
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Reserve Retirement Points Calculator
Add up Reserve/Guard points, check good years, and find your retired-pay multiplier.
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Frequently asked questions
Do the calculators round results?
Results are shown with sensible precision (usually two decimal places) but computed at full floating-point precision so intermediate values are not rounded.