Scientific Calculator

Type a whole calculation such as 2(3 + 4)^2 − √81, or tap the keys, and the answer appears as you go; press Enter or = to fix it. It has brackets, powers, square roots, sin, cos and tan and their inverses in degrees or radians, natural and base-10 logs, factorials, percent, π, e, scientific notation and Ans for the last answer. Multiplication can be left out where it is obvious, such as 2π or 3(4 + 5). Every answer goes into a history list, and selecting one puts its answer back into the calculation.

How it works

Scientific Calculator is a web page that does its work on your own device. Everything you type or choose is worked out by your browser and never sent to a server, so nothing is stored and there is nothing to delete. There is no account, no sign-up and no limit on how often you use it.

Straight to one job

Online Calculator

Typing an expression

Type a whole calculation the way you would write it, such as 2(3 + 4)^2 − √(81), or tap the keys; the answer shows as you type and Enter or = fixes it. Multiplication can be left out where it is obvious: 2π, 3(4 + 5) and 2sin(30) all multiply. Brackets you forget to close are closed for you at the end. After an answer, starting with an operator carries on from it, and Ans always means the last answer.

Order of operations

The calculator follows the usual order: brackets first, then powers (worked right to left, so 2^3^2 is 2^9 = 512), then multiplication and division from left to right, then addition and subtraction. A minus sign in front of a power applies after the power, so −3^2 is −9; write (−3)^2 for 9. Factorial (!) and percent (%) apply to the number just before them.

Degrees and radians

The DEG/RAD button at the top of the display sets how angles are read. School geometry and most practical work use degrees; calculus and physics often use radians, where a full turn is 2π. In degrees the calculator gives exact zeros where they belong, so sin(180) is 0 rather than a tiny rounding error, and it says when tan has no value, as at 90 degrees.

Accuracy

Answers are worked in double-precision floating point, the same as most calculators and spreadsheets, and shown to 12 significant figures. Very large and very small answers switch to scientific notation, such as 6.02214076e23. Factorials of non-whole numbers use the gamma function, so 0.5! is about 0.886.

What it does

• Type whole expressions or tap the keys
• Answer shown as you type
• sin, cos, tan and inverses, in degrees or radians
• Powers, roots, ln, log, factorial, percent
• π, e, scientific notation and Ans
• 2π and 3(4 + 5) multiply without a × sign
• History of every answer, ready to reuse
• On phones the keypad replaces the keyboard

Questions

Does it follow the order of operations?

Yes: brackets, then powers, then multiplication and division left to right, then addition and subtraction. 2 + 3 × 4 is 14, and −3^2 is −9.

How do I switch between degrees and radians?

Press DEG at the top of the display; it changes to RAD. sin(30) is 0.5 in degrees; in radians, sin(π/6) is 0.5.

Can I type instead of tapping?

Yes. Type into the display with your keyboard, using * or × for times, / or ÷ for divide, ^ for powers and sqrt or √ for roots, then press Enter.

Why is sin(180) exactly 0?

In degrees the angle is reduced to one turn first, so angles that should give 0 do. Most calculators show a tiny rounding error such as 1.2e−16 instead.

How do I use the last answer?

Start with an operator, such as + or ×, and the calculation carries on from the answer, or press Ans anywhere in a new calculation.

What does % do?

It divides the number before it by 100, so 15% × 80 is 12 and 200 × 7.5% is 15.

Is anything sent anywhere?

No. Every calculation runs in your browser and nothing you type is sent to us or stored.

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