homemaths calculatorsscientific calculator

Scientific Calculator

Scientific calculator with deg/rad trig, log, powers, roots, nCr, memory and history

0
Keyboard works too: type the sum, Enter for =, Esc to clear, Backspace to delete. Type * or x for ×, / for ÷, ^ or ** for powers. Implied multiplication works (2π, 3(4+1)).
Ans
0
Memory (M)
0
History

Your calculations appear here. Tap a sum to edit it again, or tap an answer to use it.

Order of operations: brackets, then powers and roots, then × and ÷, then + and − (BODMAS). So −2² = −4 and 2^3^2 = 2^9. Percent works like on a phone: 500 + 18% = 590, 500 − 10% = 450, and 18% alone is 0.18. Trig works in degrees now; tap DEG/RAD to switch.

Runs entirely in your browser. Nothing you type or upload is sent to us or stored.

Results are for general guidance. Please check anything important before relying on it. Terms of use

How to Use

  1. Type a sum with the on-screen keys or your keyboard, for example 2 + 3 × sin(30). A preview of the answer appears under it as you type.
  2. For trigonometry, check the DEG / RAD key first. School problems in degrees need DEG.
  3. Press = (or Enter). The answer is saved as Ans, and if you press an operator next (such as ×), the sum carries on from it.
  4. Press 2nd for sin⁻¹, cos⁻¹, tan⁻¹, eˣ, 10ˣ, ∛, x³, the y-th root and nPr. Use M+, M− and MR to keep a number in memory.
  5. Your recent sums are listed under History. Tap a sum to edit it again, or tap an answer to use it in a new sum.

A scientific calculator that shows how it read your sum

This free online scientific calculator works like the Casio-style calculators used in Class 11, Class 12 and college. It does trigonometry in degrees or radians, logarithms, powers and roots, factorials, permutations and combinations, and it has a memory and an answer key. It runs in your browser, has large keys on a phone, and takes input from a computer keyboard too.

It also does something a normal calculator doesn't. Under the answer it shows “Read as”: the same sum with brackets added the way the calculator understood it. Say you typed 1/2π expecting 1 ÷ (2π). The line (1 ÷ 2) × π tells you straight away that you need brackets.

Order of operations (BODMAS)

The calculator follows the standard order taught in school: Brackets, Orders (powers and roots), Division and Multiplication from left to right, then Addition and Subtraction from left to right.

You typeRead asAnswer
2 + 3 × 42 + (3 × 4)14
−2²−(2²)−4
(−2)²(−2)²4
2^3^22^(3^2)512
100 ÷ 10 ÷ 5(100 ÷ 10) ÷ 52
2π2 × π6.28318530718

Powers are worked out from right to left, so 2^3^2 means 2 to the power 9. A number written next to a bracket, π or a function is multiplied by it: 3(4 + 1) = 15 and 2sin(30) = 1. If you leave out closing brackets at the end, the calculator adds them.

Degrees and radians

Angles in Class 10 trigonometry are in degrees, so keep the calculator on DEG. Radians are used in Class 11 onwards and in calculus. To convert:

radians = degrees × π / 180
degrees = radians × 180 / π

In DEG mode the standard angles give exact values: sin 30° = 0.5, cos 60° = 0.5, tan 45° = 1, sin 180° = 0 and cos 90° = 0. tan 90° is shown as undefined, not as a huge number.

Angle0°30°45°60°90°
sin01/21/√2 ≈ 0.7071√3/2 ≈ 0.86601
cos1√3/2 ≈ 0.86601/√2 ≈ 0.70711/20
tan01/√3 ≈ 0.57741√3 ≈ 1.7321not defined

Worked examples

  • Compound interest: ₹10,000 at 8% a year for 5 years grows to 10000 × (1 + 8/100)^5 = 14,693.28.
  • Combinations: the number of ways to choose 2 students from 5 is nCr(5, 2) = 10. The number of ways to arrange them is nPr(5, 2) = 20.
  • Log to any base: log(8, 2) = 3, because 2³ = 8. log(1000) on its own is base 10 and gives 3; ln uses base e.
  • Roots: √144 = 12, ∛(−27) = −3, and root(32, 5) = 2 (the fifth root of 32).
  • Inverse trig: sin⁻¹(0.5) = 30 in DEG mode.

Why 0.1 + 0.2 shows 0.3 here

Computers store numbers in binary, where 0.1 can't be written exactly. That's why many programs show 0.1 + 0.2 = 0.30000000000000004. This calculator rounds answers to 12 significant digits for display and clears leftovers such as 2.8 × 10⁻¹⁷ after subtraction. So you see 0.3, and 1/3 shows as 0.333333333333. Very large or very small answers are shown in scientific notation, for example 20! = 2.43290200818 × 10¹⁸.

Tips

  • % works like on a phone. On its own or after × and ÷ it divides by 100 (200 × 15% = 30). After + or − it takes that percent of the number before it, so ₹500 + 18% = 590 and 500 − 10% = 450.
  • EXP types E for “× 10 to the power”: 6.022E23 is 6.022 × 10²³, and πE2 is π × 100. On a keyboard you can type * or x for ×, and ** for a power.
  • Factorial works for whole numbers 0 to 170. 171! is too large for any normal calculator.
  • History is kept only while the page is open. Nothing you type is sent anywhere.

Frequently Asked Questions

Because the calculator is in radian mode, so it worked out the sine of 30 radians (about 1,719°). Tap the DEG/RAD key so it shows DEG, and sin(30) gives 0.5. School trigonometry problems in degrees always need DEG mode.

Because powers are worked out before the minus sign. So −2² means −(2 × 2) = −4. To square negative two, use brackets: (−2)² = 4. The 'Read as' line under the answer shows the brackets the calculator used.

Type log with the number and the base, separated by a comma: log(8, 2) = 3 and log(81, 3) = 4. log(x) on its own is the common log (base 10) and ln(x) is the natural log (base e ≈ 2.71828). You can also use the change-of-base rule: log₂8 = log(8) ÷ log(2).

Ans holds the answer to your last calculation. After you press =, pressing × or + carries on from it, and you can type Ans anywhere in a new sum. M is a separate memory. M+ adds the current answer to it, M− subtracts it, MR puts M into your sum and MC clears it.

Press nCr, type n, a comma, then r, and close the bracket: nCr(10, 3) = 120. For permutations press 2nd then nPr: nPr(10, 3) = 720. Both need whole numbers with r no bigger than n.

Only on this page while it's open. The last 20 calculations are listed under History so you can reuse them. Reloading or closing the page clears them. Nothing is stored on a server.