Scientific Calculator

This is a full scientific calculator that works like the one in your school bag, with a few things a handheld can’t do. Type a whole calculation such as sin(30) + √16, either on the on-screen keys or with your keyboard, and the answer updates underneath while you type. Press = to keep it, and it lands in a history list you can tap to reuse.

It covers what students, engineers and tradies reach for: sin, cos and tan with their inverses, hyperbolic functions, ln, log and log₂, square, cube and nth roots, powers, factorials, percentages, π, e, scientific notation with EE, combinations and permutations, and four memory keys. Switch between degrees and radians with one key; the screen always shows which you are in.

It is careful with numbers. Answers are rounded to 15 significant digits so 0.1 + 0.2 shows 0.3, not 0.30000000000000004, and sin(180°) is exactly 0. When something can’t be worked out, such as dividing by zero or the square root of a negative number, it tells you why in plain words. The maths runs in your browser with its own calculation engine, so nothing you type is sent anywhere.

1. Type a calculation into the display, or tap the keys. Brackets and functions such as sin( open for you.
2. Watch the grey line under your calculation: it shows the answer so far.
3. Press = (or Enter) to finish. Type an operator next to carry on from the answer, or a number to start fresh.
4. Use DEG to switch to radians, and 2nd to reach the inverse functions printed in the corner of each key.
5. Tap a past calculation in History to edit it again, or tap its answer to drop it into your current sum.

• Trigonometry in degrees or radians: sin, cos, tan, sin⁻¹, cos⁻¹, tan⁻¹, plus sinh, cosh, tanh and their inverses.
• Logs and powers: ln, log (base 10), log₂, log with any base as log(x, base), eˣ, 10ˣ, 2ˣ, x², x³, xʸ and 1/x.
• Roots: √, ∛ and any nth root with root(n, x), including odd roots of negative numbers (∛−8 = −2).
• Factorials (including halves via the gamma function, so 0.5! works), nCr, nPr, absolute value and percentages.
• Correct order of operations, brackets, and multiplication without a sign: 2π, 3(4 + 1) and 2sin(30) all work.
• Memory keys MC, MR, M+ and M−, plus Ans for the last answer. Memory, history and the angle mode are remembered in this browser.
• Live preview as you type, clear error messages, and a missing closing bracket at the end is added for you.
• Full keyboard use: digits, + − * / ^ ( ) !, Enter for =, Backspace and Escape to clear.

• Check the DEG or RAD badge before trig. sin(30) is 0.5 in degrees but −0.988 in radians, a common exam mistake.
• A minus sign in front of a power applies after it: −2^2 is −4. Write (−2)^2 to square negative two.
• Values written side by side are multiplied before ÷, so 1/2π means 1 ÷ (2π). Add brackets when in doubt.
• Percent works like a shop calculator after + or −: 200 + 10% is 220. Anywhere else, 10% simply means 0.1.
• Very large and very small answers switch to scientific notation, such as 2.43 × 10¹⁸. Copy answer gives the full number in a form you can paste back in.