Unlimited Calculator
Exact answers, real units, and algebra that shows its work.
![The Mac calculator in light mode — a display card reading 1.2569/9 with the approximate answer 0.139655555556 beneath it, the scientific keypad below with sin, cos, tan, ln, log, factorial, nCr, nPr, mean and stdev, and the tape beside it: 1/3 + 1/6 answered exactly as 1/2, 3.5 ft converted to flightlevel, 60 mph times 2 h given in miles, 120 W times 3 h in kWh, 360! and 100! as exact integers, solve(x^2 = 4, x) as [−2, 2], and a line the app declines with “this is not something I can evaluate”](calculator-tape.png)
A calculator that does not round unless you ask it to. Type an expression and get the exact answer: a fraction stays a fraction, a root stays a root, and a number with a unit keeps that unit through every step. Solve, differentiate, integrate, and factor symbolically, then plot the result.
Arithmetic that doesn’t lie
- Exact at any size — whole numbers and fractions with no limit: a 200-digit factorial, an exact 1/3, no floating-point drift.
- Decimals mean what you typed — 0.1 + 0.2 is exactly 0.3.
- Exact or decimal, your choice — show any result as a decimal at the precision you pick. Ask for fifty places and all fifty are right.
- Programmer bases — binary, octal, and hexadecimal with bitwise operations at any size. Complex numbers work everywhere.
- Approximation is marked — an answer that is not exact carries a ≈. No mark means the number is exactly right.
Units that carry through
- Type it like you say it —
3.5 ft to m,60 mph * 2 h, or(120 W * 3 h) to kWh. The answer comes back with the right unit. - Every quantity — length, mass, time, area, volume, pressure, energy, power, force, speed, data size and rate, angles, and temperature with its offsets handled correctly.
- Domain units — astronomical distances, nuclear energies, molar quantities, and aviation units.
- Physical constants by name — each with its unit, and with its uncertainty where the SI does not fix it exactly.
- Dimensional honesty — metres plus kilograms is an error, not a number. Conversions between exact units are computed as fractions, so
1 mi to ftis 5280 exactly.
Algebra, not just arithmetic
- Simplify, expand, and factor — work with expressions, not just numbers.
- Solve exactly — when a root is irrational, the root is kept:
solve(x^2 = 2, x)answers ±√2. - Calculus — symbolic derivatives, integrals, limits, and series expansions.
- Matrices — exact determinants, inverses, ranks, and eigenvalues.
- Plot from the answer — plots break where the function is undefined instead of drawing a line through infinity.
A tape, not a screen
- Every entry stays — visible, editable, and ready to run again. Change a line and everything below it updates.
- Name things — assign variables, define your own functions, and keep them per document.
- A library you can read — 243 functions, about 200 units, and every constant, each with a one-line explanation and a worked example, one tap from your line.
- Exact by default — approximation is a choice you make, not one made for you.
One purchase, every device
One purchase covers Mac, iPhone, and iPad.
No account, no subscription, no in-app purchases, no ads, no analytics, and no tracking. Every computation runs on the device; no cloud required.