Calculators tools
Fast, accurate calculators for students: percentages, dates, units, scientific expressions and everyday math — free, private, and instant in your browser.
2 live tools
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Unit Converter
Convert 90+ units across length, mass, temperature, area, volume, time, speed, energy, power, pressure, frequency and electrical units. Instant, accurate, free.
CalculatorsOpen
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Scientific Calculator
A fast scientific calculator in your browser: trigonometry, logarithms, powers, constants and brackets — with full keyboard support and an expression history.
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Are the calculators accurate?
Yes — every formula is documented on the tool page and covered by automated unit tests, including edge cases.
Do the calculators work offline?
All calculations run in your browser, so they work even with no internet once the page is loaded.