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Free Calculators

I’ve brought my math, science and finance calculators together so you can find the right tool quickly.

Choose a subject or search for the quantity you’re trying to calculate.

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Tools with explanations

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Browse by subject, or search by a formula, quantity or tool name.

49 calculators

Algebra & Functions12

Calculus & Series13

Statistics & Data5

Physics & Chemistry12

Finance2

Conversions3

Study & Everyday2

Check the Method

I recommend checking the inputs and assumptions before relying on a result.

Choose the Right Tool

Match the calculator to your equation, model or unit conversion. Similar names can describe different problems.

Check Your Inputs

Confirm the units, signs, bounds and variable names. Use a worked example to check that you’ve entered them correctly.

Read the Limits

Check supported expressions, rounding and model assumptions. A projection or numerical estimate depends on the inputs you choose.

Common Questions

A few things to know before you start calculating.

Do I Need to Sign Up?

No. You can open and use the calculators without creating an account.

How Should I Check a Result?

Check the units and assumptions, then compare a worked example or calculate a simple case by hand. For a consequential decision, verify the result with a suitable reference or professional tool.

Can I Use the Calculators on My Phone?

Yes. Open the calculator from this directory, then enter your values in its form. Some graphs and tables may be easier to inspect on a larger screen.

Are the Formulas Explained?

Most calculator pages include formulas, input definitions, worked examples or an explanation of the result. Check the individual page for its method and supported cases.

Need Another Calculator?

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