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Enter a principal, annual rate and time to find the simple interest earned and the final balance.

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Enter your foot length to estimate US, UK and EU shoe sizes for men and women.

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Convert any number to scientific and engineering notation, and see its order of magnitude.

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Evaluate expressions with trig functions, logarithms, powers, roots and constants — in degrees or radians.

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Find how long it takes to reach a savings goal with regular monthly deposits and interest.

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Work out how much sand you need in cubic yards, cubic feet and tons — for paver bases, sandboxes and leveling.

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Find how many responses you need for a given confidence level and margin of error.

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Enter an amount and a tax rate to get the tax and the total price including tax.

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Convert pay between hourly, daily, weekly, monthly and annual, based on your hours and weeks worked.

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Round any number to a set number of decimals, or to the nearest 10 or 100 — with round-up and round-down too.

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