Math, demystified.Without the ads.

Every calculator you actually need, none of the ones you don't, and enough personality to make math slightly less terrifying.

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Because adulting is expensive and spreadsheets are terrifying

We're not doctors. But we did stay up late reading Wikipedia.

No, you can't use a calculator on the test. Good thing this isn't a test.

For when the rest of the world refuses to use metric. Or vice versa.

Calculators with no productivity value whatsoever. You're welcome.

Everything that comes after you say yes to the house.

Monthly payment, total interest, and a full amortization table.

Find out exactly what you're signing up for — for the next 30 years.

Body Mass Index in metric or imperial, with category indicator.

A number, not a verdict. Context is everything.

Watch your money grow exponentially with a visual chart.

The eighth wonder of the world, visualized.

Your Total Daily Energy Expenditure based on your stats and activity.

Your body burns calories just by existing. You are, right now, doing great.

Three modes: percent of, percent change, and what percent.

What is 15% of the bill? (Asking for a friend at a restaurant.)

Project your retirement savings with growth charts.

Future you will either thank or blame present you. Choose wisely.

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Yes, this is a calculator site. No, we are not embarrassed about it.