Scientific calculator
A scientific calculator for trigonometry, logarithms, powers and roots, right in your browser.
How this calculation works
The four-function keys behave like the basic calculator, working left to right through whatever you press. The extra row applies a single function to whatever is currently on the screen: trigonometric functions respect the DEG/RAD toggle, log is base 10, ln is the natural logarithm, and √, x² and 1/x apply immediately without needing the = key.
Tips
Check your angle mode first
sin(30) gives 0.5 in degree mode but a very different number in radian mode. The toggle above the keypad shows which one is active.
Function keys act instantly
Unlike + or ×, pressing sin, log or √ applies straight away to the number on screen — there's no need to press = afterwards.
Left-to-right, not order of operations
The four-function keys work in the order you press them, so 2 + 3 × 4 gives 20 here, while standard math order gives 14. Work out 3 × 4 first, then add 2.
log and ln are different
log is base 10 (log 100 = 2) and ln is the natural logarithm with base e, about 2.718 (ln e = 1). Both only accept numbers greater than zero.
Use memory for multi-step problems
Store an intermediate result with M+ and bring it back later with MR, instead of retyping long decimals and losing precision.
Frequently asked questions
What's the difference between DEG and RAD?
Degrees and radians are two units for measuring angles. Most everyday trigonometry uses degrees (a full circle is 360°); radians (a full circle is 2π) are more common in advanced math and physics.
What does 1/x do?
It replaces the number on screen with its reciprocal — 1 divided by that number.
Can I chain functions together?
Yes. For example, entering 9, then √, gives 3; pressing x² next squares that result back to 9.