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Free online calculator.

Calcr provides free online calculators with formulas, worked examples and clear results. Choose a calculator, enter your values and check its calculation rules. No account is needed.

sin, cos, tan, log (base 10), ln, sqrt, cbrt, abs, powers, pi, e, and %. Use parentheses for function arguments. Open games from the games directory or Code Mode.

Calculated on your device. No account needed.
Your calculations stay on your deviceFree, without an accountBuilt for touch and keyboard

A TOOL FOR THAT

Small tasks. Clear answers.

All calculators

Explore calculator collections

01 / THE COLLECTION

Math calculators

Work with expressions, percentages, fractions, ratios, averages and weighted grades using tools with clear formulas and examples.

02 / THE COLLECTION

Everyday calculators

Calculate calendar age, date differences, clock durations and discounted prices with explicit counting and rounding conventions.

03 / THE COLLECTION

Finance calculators

Free finance calculators for US 2026 paycheck withholding, fixed-rate mortgages and monthly compound interest, with assumptions and worked examples.

04 / THE COLLECTION

Health calculators

Free health calculators for adult BMI and maintenance calories. Review formulas, worked examples, applicable ages and limits before interpreting results.

THE OTHER SIDE OF CALCR

Your brain deserves a break, too.

A few familiar games, right here in your browser. No download. Just one more try.

Take a break
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BEHIND THE ANSWER

A little understanding goes a long way.

All guides ↗

How do I use Calcr?

  1. Enter an expression in the calculator above, or choose a tool for your task.
  2. Select the calculation mode and enter your values. For trigonometry, check DEG or RAD before calculating.
  3. Calculate, then check the result against the formula and examples on the tool page.

Choose a calculator by the answer you need

CalculatorExample inputResult
Percentage calculator15% × 8012
Fraction calculator2/3 + 5/1213/12
Ratio calculator18:243:4
Average calculator4, 8, 128

Frequently asked questions

Is Calcr free to use?

Yes. Public calculators and browser games are free, without a visitor account, subscription or payment card.

Where are my calculations processed?

Calculator inputs are processed in your browser. Scientific history belongs to the current session. Optional analytics is separate and requires consent.

How can I check a calculation?

Use the formulas, worked examples and limits on each tool page. Check units, rounding and date-counting conventions before relying on an answer.

Check the method behind the result

Our examples can be recomputed from the stated formulas. These references explain the underlying methods: