A full scientific calculator, free and in your browser
This calculator handles everyday arithmetic as well as the functions you need for school, university and engineering work: parentheses, powers, square roots, percentages and the three basic trigonometric functions. Nothing is installed, nothing is stored, and no sign up is required. Open the page, type the expression and read the result.
What the keys do
Use the number and operator keys for arithmetic, parentheses to group operations, and the function keys for sine, cosine, tangent and square root. Trigonometric inputs are read in degrees, so sin(30) returns 0.5. The percent key divides the preceding number by 100, so 200 × 10% gives 20.
The display accepts keyboard input as well. Type the expression, then press Enter or the equals key to calculate. Press C to clear the field and start again.
Examples you can try
- Order of operations: 12 + 8 × 3 returns 36, because multiplication runs first. Write (12 + 8) × 3 to get 60 instead.
- Discount: 2500 − 2500 × 15% gives the price after a fifteen percent discount.
- Right triangle: with a hypotenuse of 10 and an angle of 30 degrees, 10 × sin(30) returns the opposite side.
- Square root: √(144) returns 12, and √(2) returns 1.414213562.
Common questions
Does it work on a phone?
Yes. The key grid scales down to small screens and every key is large enough to tap comfortably.
Are degrees or radians used?
Degrees. If your course works in radians, convert first by multiplying the radian value by 180 and dividing by π.
Is my input sent anywhere?
No. The calculation runs entirely in your browser, so nothing you type leaves your device.
Can I use it during an exam?
That depends on your institution’s rules. Check with your examiner before relying on any online calculator.
Need a calculator on your own website?
I build custom calculators, quote forms and interactive tools into WordPress sites, with clean code and no heavy plugin stack. If you need one for your business, tell me what it should work out and I will suggest an approach.