Notchwillow: آلة حاسبة علمية

Scientific calculator for your toolbar that keeps every answer on an editable tape. Type the whole calculation the way you write it on paper — brackets, powers, percent and functions — and the answer appears while you type.

Every answer stays on the tape

• The last 200 lines are saved in your browser, together with the line you are typing, so nothing is lost when the popup closes.
• Click a past line to reuse it; double-click to fix it — the line and the lines below that use ans are recalculated.
• Copy a result or a whole line, delete with Undo, search the tape in the full-tab view.

A real scientific calculator

• sin, cos, tan and their inverses in degrees or radians, sinh, ln, log, roots, powers, factorial, nCr, gcd, mod, round.
• Exact arithmetic: 0.1 + 0.2 is 0.3, 2^64 keeps all 20 digits, 1/3 × 3 is exactly 1.
• Fractions: 3/4 + 1/6 shows 11/12 at the press of a/b; mixed numbers like 1 1/2 work too.
• Percent as people use it: 200 + 15% = 230, 15% of 80 = 12.
• Memory keys (M+, M−, MR, MC) and named variables such as rate = 7.5%.

Programmer mode

• HEX, DEC, OCT and BIN side by side, 8/16/32/64-bit words, signed or unsigned.
• AND, OR, XOR, NOT, shifts, with wrap-around shown clearly.

Unit converter

• Length, weight, temperature, area, volume, speed, data (kB, MB and KiB, MiB…) and time, with exact factors.
• Feet and inches together: 1.8 m = 5 ft 10.87 in. Send the answer to the calculator with one click.

Made for the keyboard

• Alt+Shift+C opens it from any page; Enter calculates, ↑ and ↓ recall earlier lines, Ctrl+C copies the answer.
• Select numbers on a page, right-click and choose Calculate to get the answer in a calculator tab.
• Big readable digits in four sizes, a thousands separator and decimal comma for your language, light and dark themes, 16 languages.

مصممة لتكون خاصة
Works offline in Firefox and Opera. No account, no network requests, no analytics. It asks only for storage and the context menu, and cannot read the pages you visit. This version is free.