Online calculator
A free calculator you can use right away. Switch between basic arithmetic and scientific functions for homework, work, or everyday math — all in your browser.
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Calculator
Degrees for sin/cos/tan · keyboard supported
How to use this calculator
Tap the keys or type on your keyboard. Immediate-execution math works like a pocket calculator — pick an operator after a number, enter the next value, then press equals.
- Basic mode covers clear, sign change, percent, and the four arithmetic operations.
- Scientific mode adds sin, cos, tan (degrees), ln, log, square root, square, xʸ, π, e, 1/x, and n!.
- Keyboard shortcuts work on this page — digits, operators, Enter for equals, Backspace, and C to clear.
How to use this calculator
Tap the keys or type on your keyboard. Immediate-execution math works like a pocket calculator — pick an operator after a number, enter the next value, then press equals.
- Basic mode covers clear, sign change, percent, and the four arithmetic operations.
- Scientific mode adds sin, cos, tan (degrees), ln, log, square root, square, xʸ, π, e, 1/x, and n!.
- Keyboard shortcuts work on this page — digits, operators, Enter for equals, Backspace, and C to clear.
Interesting facts
Order of operations still matters
This pad uses immediate execution like most handheld calculators — 2 + 3 × 4 equals 20, not 14. For PEMDAS-style expressions, compute multiplications and divisions first, or use a dedicated math tool.
Degrees vs radians
Sin, cos, and tan here expect degrees (sin 30 = 0.5). Many programming languages and advanced CAS tools default to radians — double-check before copying results into code.
π and e are irrational
The calculator stores π and e to double precision. That is plenty for school and everyday work, but not a substitute for symbolic math when you need exact forms.
Factorials grow fast
n! is only defined for non-negative integers here, and large n overflows quickly. Use scientific or spreadsheet tools when you need Γ(n+1) for non-integers or huge values.
Percent is context-dependent
Pressing % divides the current display by 100. It does not automatically apply “20% of previous total” the way some business calculators do — enter the base amount deliberately.
Frequently asked questions
Yes. Use the basic and scientific pad on this page with no account, download, or payment.
Degrees. For example, sin(30) returns 0.5. Convert radians to degrees first if your formula is in radians (multiply by 180/π).
Yes on this page. Type digits and . + − * /, press Enter or = for the result, Backspace to edit, and C or Delete to clear.
Those tools solve specific problems — BMI, mortgages, unit conversions — with formulas and worked examples. This page is a general-purpose pad for quick arithmetic and common scientific functions.
No. Values stay in your browser session only. Refreshing the page resets the display.