Start with what you know
You shouldn't need to know a formula's name, or which of a hundred calculators to open, before you can begin. So the Calcist homepage is one box. Type, or say out loud:
- I work 7:30 to 4:15 with a 45 minute lunch, and it counts your hours.
- I made $87,000 last year and $94,000 this year. What percentage did my income increase?
- How much paint for four walls that are 12 × 8?
- If I invest $500 a month at 8% for 25 years…
Calcist recognizes the kind of problem, states the assumptions it made (two coats of paint, 350 square feet a gallon), gives the answer in a plain sentence, and links to the full calculator when you want to change the details.
Simple on the surface, serious underneath
When you need more than a quick answer, every kind of calculator is one tap away at the top of every page: Basic with a running tape you can edit, Scientific, Graphing, Financial with the five TVM keys, an Adding machine that prints its tape, and a Programmer calculator that shows every bit. Behind them are dozens more for money, home projects, math and math practice.
Precision is a promise
A calculator that looks impressive but is sometimes wrong is worse than none. So:
- No AI does the arithmetic. Every answer comes from tested math code that runs on your device, never a guess written to sound right.
- Exact when it can be. 1/10 + 2/10 is exactly 3/10, 2⁵³ + 1 is 9,007,199,254,740,993 to the last digit, and a loan schedule adds up to the cent.
- Checked against known answers. Calculator pages list the test cases they pass, each one worked out independently, and every update reruns thousands of automated tests.
- Honest about limits. When an answer depends on an assumption, Calcist says so. When a question is too vague, it asks instead of guessing. Money tools are estimates for planning, not financial advice.
Private by design
Everything you type is worked out in your own browser. Nothing is sent to a server, there's no account and nothing to sign up for. The microphone is only used when you tap it, and Calcist asks first. Read exactly what is stored and where.
For everyone who works with numbers
A child practicing times tables in a Math Minute. A homeowner checking a quote before signing. A small-business owner finding the break-even point. A student who wants to see every step of a long division. A programmer converting hex. The math is different; the promise is the same: the right answer, shown clearly, that you can check yourself.
Whatever you're trying to figure out, start here.