Type any expression and see the answer as you type, or switch to full screen. Below it, 43 solvers cover algebra, fractions, primes, statistics, geometry, calculus, money and units, each with step-by-step working.
Enter calculate · Esc clear · ↑ last answer · type nCr(10,3), logb(8,2), nthRoot(81,4), 5 mod 3
Step-by-step solvers
Each tool has its own page and shows the full working as you type.
From the blog
Worked examples that explain the math behind the tools.
Quick reference
The formulas the tools use, grouped by topic.
Why use it
Discriminants, Euclid's algorithm, synthetic division, long division with repeating digits, prime factor tables and amortization schedules are all shown.
Nested brackets, inverse and reciprocal trig, any-base logs, nth roots, factorials, combinations, complex results, DEG and RAD, fractions and memory keys.
One tap turns the calculator into a full-screen keypad, sized for Chromebooks, tablets and projectors.
Everything runs in your browser. History and notes stay on your device, and nothing needs an account.
Help
Press the DEG button above the display. It switches to RAD and applies to sin, cos, tan, csc, sec, cot and their inverses. In DEG mode sin(90) is 1; in RAD mode sin(pi/2) is 1.
Yes. Press Full screen above the display. The keys grow to fill the screen, which works well on Chromebooks, tablets and classroom projectors. Press it again or Esc to exit.
Press Decimal to switch to Fraction mode, so 0.75 shows as 3/4.
Type logb(x, base), nthRoot(x, n), nCr(n, r) or nPr(n, r), or use the keys. log(x) is base 10 and ln(x) is the natural log.
It is free and needs no sign-up. It works on phones, tablets, laptops and Chromebooks in any modern browser.