Calculator
A calculator with everyday or scientific keys that gives exact answers, shows how it read your sum and keeps a tape, on your device. Free, with no account or uploads.
Press = or Enter and the answer shows here, with how the sum was read.
Tape
Every answer is listed here. Press one to use it again; GT adds them all up.
A rounded answer is worked out to 60 digits and shown to this many.
Read with one rule for what calculators disagree on: things written side by side multiply like ×, from left to right, so 6 ÷ 2(1 + 2) is 9; −2² is −4; and a function without brackets takes only what follows it. The answer says so whenever a sum is one of these.
A little help along the way
Follow these steps. Every option is explained underneath. Everything is worked out in your browser; nothing is sent anywhere.
- Type or press a sumType with your keyboard, paste a sum, or press the keys. The answer shows quietly under the sum as you type.
- Press = or EnterThe answer is shown large, with whether it is exact, and the sum drawn as a textbook would draw it.
- Carry on or start againPress an operator to carry the answer on as Ans, or a number to start a new sum. AC clears the sum.
- Use the tapeEvery answer is listed on the tape. Press one to use it again, or GT to add them all up.
Every option explained
- Exact answers
- Numbers are kept as exact fractions, so 0.1 + 0.2 is 0.3 and a third stays a third. Answers that cannot be fractions, such as √2, are worked out to 60 digits and shown to 12, or as many as you choose up to 30.
- How a sum is read
- Things written side by side multiply like ×, from left to right, so 6 ÷ 2(1 + 2) is 9; −2² is −4; and a function written without brackets takes only what follows it. Whenever a sum is one that calculators disagree on, the answer says how it was read.
- Percent
- 200 + 10% adds 10% of 200, as a desk calculator does, and 50% × 80 is 40.
- Scientific keys
- sin, cos and tan and their inverses in degrees or radians, ln, log and log with any base (log_2(8)), powers and roots, factorials, nCr and nPr, Ans and the memory.
- Fractions
- Press S⇔D, or choose under More options, to see answers that are fractions as fractions.
- Keeping the tape
- The tape goes when you leave the page unless you turn on “Keep the tape on this device”; it then stays in this browser until you turn it off.