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.
Final Grade Calculator
Find out exactly what you need on the final exam to hit your target grade.
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Age Calculator
Calculate exact age in years, months, and days — plus your next birthday.
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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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GPA Calculator
Calculate your GPA on the 4.0 scale from letter grades and credits.
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Date Duration Calculator
Count days until a date, or the exact time between any two dates.
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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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Shoe Size Converter
Convert between US Men's, Women's, UK, EU, and CM sizes — with GS equivalents.
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Aspect Ratio Calculator
Solve missing dimensions for 16:9, 4:3, and any custom aspect ratio.
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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.