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Scientific Calculator
A free online scientific calculator: type or tap expressions with powers, roots, logarithms, trigonometry in degrees or radians, factorials, π, and e, with the answer shown as you type and a history of results.
Scientific Calculator: The calculator reads the expression with its own parser, never by running it as code, and follows the usual order of operations: powers before multiplication and division, then addition and subtraction, with brackets first. Results show 12 significant digits, which hides the tiny rounding errors of binary arithmetic, so 0.1 + 0.2 shows as 0.3. Runs 100% locally in your browser with zero server file uploads.
- Category
- School & study tools
- Runs
- In your browser
- Cost
- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
Type or tap. Multiplication can be implied, as in 2π or 3(4+1); ^ is a power, ! a factorial, and % divides by 100. Enter calculates; Escape clears.
Order of operations
Expressions are read the way mathematics is written: brackets first, then powers and roots, then multiplication and division from left to right, then addition and subtraction. Powers stack from the right, so 2^3^2 is 2^9 = 512. Multiplication can be left out between a number and a bracket or a constant, so 2π and 3(4 + 1) work as written.
The answer updates as you type, and an expression that cannot be read says why, such as a missing bracket or a division by zero, instead of showing a wrong number.
Why 0.1 + 0.2 shows 0.3
Computers store numbers in binary, where 0.1 has no exact form, so sums like 0.1 + 0.2 come out a hair off, as 0.30000000000000004. The calculator shows 12 significant digits, which removes that noise while keeping more precision than any school or engineering task needs. Trigonometric results that should be whole, such as sin 180° = 0, are cleaned the same way.
For exact work with fractions, use the fraction calculator; for summarising data, the statistics calculator.
How to use it
- Type an expression, or tap the keys.
- Switch between degrees and radians for trigonometry.
- Press = or Enter to keep the result; use Ans in the next calculation, and pick earlier lines from the history.
Privacy & limitations
Everything is calculated in your browser. The history and the angle setting are kept in this browser only.
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Frequently asked questions
Why does −2² give −4?
Powers are worked out before the minus sign, as in written mathematics and most scientific calculators, so −2² means −(2²). To square −2, write (−2)², which gives 4.
Degrees or radians?
Use degrees for angles measured in degrees, as in geometry and navigation; sin 30 = 0.5. Use radians for angles in terms of π, as in calculus and physics; sin(π/6) = 0.5. The DEG and RAD buttons switch between them.
What does the % key do?
It divides by 100, so 15% is 0.15 and 200 × 15% is 30. For percentage changes and percentages of a total, the percentage calculator explains each step.
What is the difference between log and ln?
log is the logarithm to base 10, so log(1000) = 3; ln is the natural logarithm, to base e. log2 gives the logarithm to base 2.
Free tool · runs in your browser · no account required