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Scientific Calculator

A free online scientific calculator with sin, cos, tan, logs, powers, roots, factorials, brackets, memory and history, in degrees or radians.

  • Free to use
  • No sign-up
  • Numbers stay in your browser

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Click a key, or click the calculator once and type.

What the keys do

KeysWhat they do
sin cos tanSine, cosine and tangent of an angle (set DEG or RAD at the top)
sin⁻¹ cos⁻¹ tan⁻¹The opposite: find the angle from a ratio
log ln logₐxLogarithms: base 10, natural (base e), and any base
x² x³ xʸ 10ˣ eˣSquares, cubes and any power
√x ³√x ʸ√xSquare root, cube root and any root
π e ANSConstants, and the last answer
x! |x| MOD 1/xFactorial, absolute value, remainder, reciprocal
EXP ×10ˣScientific notation: 6.02 EXP 23 is 6.02 × 10²³
( )Brackets: what is inside is worked out first
M+ M− MR MCMemory: add, subtract, recall, clear
d/dx ∫dxSlope at a point, and area under a curve

Press AC to start again and DEL to remove the last key. After an answer, press an operator to carry on from it.

Try these calculations

CalculateAnswerShowsUse it
sin(30)0.5sine, in degrees
cos(60)0.5cosine, in degrees
tan(45)1tangent, in degrees
sin⁻¹(0.5)30the angle, in degrees
log(1000)3base 10
ln(e)1natural log
√14412square root
∛273cube root
2¹⁰1,024a power
5!120factorial
π × 5²78.5398163397area of a circle, radius 5
(2 + 3) × 420brackets first
6.02 EXP 236.02 × 10²³scientific notation
d/dx(x², 3)6slope of x² at x = 3
∫(x², 0, 3)9area under x² from 0 to 3

Press Use to put a calculation into the calculator and see the answer. Every answer here was checked on this calculator (angles in degrees).

Degrees or radians?

Angles can be measured in degrees (a full turn is 360°) or radians (a full turn is 2π). Set DEG or RAD at the top of the calculator before you use sin, cos or tan.

CalculateDEGRAD
sin(30)0.5−0.9880316241
cos(60)0.5−0.9524129804
sin(90)10.8939966636
tan(45)11.6197751905
Why does sin(30) not give 0.5? The calculator is probably set to RAD. Switch to DEG and it gives 0.5.

Keyboard shortcuts

PressWhat it does
0 – 9 and .Type the numbers
+ − * / ^Add, subtract, multiply, divide, power
( ) % !Brackets, percent, factorial
Enter or =Show the answer
BackspaceDelete the last key
Esc or DeleteAll clear

Scientific notation with EXP

Scientific notation writes a number as a number times a power of ten. Type the number, press EXP, then the power.

Type thisAnswerMeaning
6.02 EXP 236.02 × 10²³Avogadro's number
5 EXP 35,0005 × 10³
3 EXP −20.033 × 10⁻²
1.5 EXP 61,500,0001.5 × 10⁶

Very big or very small answers are shown in this form automatically.

Order of operations

The calculator works things out in this order: brackets, functions and powers, then × and ÷, then + and −.

Type thisAnswerWhy
2 + 3 × 414× before +
(2 + 3) × 420brackets first
2 × 3²18power before ×
−2²−4power before the minus
Use the ( and ) keys whenever you want to change the order.

Good to know

  • Set DEG or RAD before sin, cos and tan. Answers differ a lot between the two.
  • A bracket left open at the end is closed for you, so (2 + 3 gives 5.
  • Long answers are rounded to 10 decimal places, so 1 ÷ 3 shows 0.3333333333.
  • Dividing by zero, the square root of a negative number, log(0) and tan(90°) show an error.

What is included

  • sin, cos, tan and their inverses, in degrees or radians
  • log, ln, any-base log, powers, roots and factorial
  • Brackets, order of operations and EXP
  • Memory keys, history of your last 20 calculations, and copy
  • Derivatives and integrals
  • Keyboard support, free, with no sign-up

Important to know

Your history stays in your own browser and is never sent anywhere. You can clear it at any time. For everyday sums, the Simple Calculator is quicker, and the Percentage and Fraction Calculators show their steps.

Use this free online scientific calculator for trigonometry (sin, cos, tan and their inverses, in degrees or radians), logarithms, powers and roots, factorials, scientific notation with EXP, percent and modulo, brackets, memory keys, and even derivatives and integrals. It follows the order of operations, keeps a history of your last 20 calculations, and has keyboard support. A table explains what each key does, and the calculations to try have a Use button that presses the keys for you. It is free, with no sign-up, and your history stays in your browser.

How to use the scientific calculator

Type a whole calculation, check it on the screen, then press =. The calculator follows the normal order of operations, so multiplication and division come before addition and subtraction: 2 + 3 × 4 is 14, while (2 + 3) × 4 is 20. Use brackets whenever you want part of a sum worked out first. You can click the keys or type on your keyboard: numbers, + − * / ^, brackets, Enter for equals, Backspace to delete and Esc to clear.

Trigonometry: degrees or radians

The sin, cos and tan keys, and their inverses sin⁻¹, cos⁻¹ and tan⁻¹, work in degrees or radians. Choose DEG or RAD at the top of the calculator. Getting this wrong is the most common reason for a strange answer.

sin(30) = 0.5 in DEG mode, but sin(30) = −0.988 in RAD mode.
cos(60) = 0.5   tan(45) = 1   sin⁻¹(0.5) = 30°

School geometry and most everyday problems use degrees. Calculus and physics formulas usually use radians, where a full circle is 2π instead of 360°. tan(90°) has no value, so the calculator shows a Math error.

Powers, roots and logarithms

  • x², x³ and xʸ: 2^10 = 1,024. Use the xʸ key for any power.
  • √x, ³√x and ʸ√x: √144 = 12 and ³√27 = 3. For any other root, enter the root first, then ʸ√x, then the number: 3 ʸ√ 8 = 2.
  • log and ln: log is base 10 (log 1000 = 3) and ln is the natural log, base e (ln e = 1). For another base, enter the base, then logₐx, then the number: 2 logₐ 8 = 3.
  • 10ˣ, eˣ and EXP: EXP enters a number in scientific notation, so 6.02 EXP 23 is 6.02 × 10²³.

Factorial, percent, modulo and memory

  • x! multiplies all whole numbers up to x: 5! = 120.
  • % works like on a phone: 200 + 10% = 220, and 15% × 80 = 12.
  • MOD gives the remainder after division: 10 MOD 3 = 1.
  • ANS inserts your last answer, and M+, M−, MR and MC add to, subtract from, recall and clear the memory.

Derivatives and integrals

Two keys go beyond a normal handheld calculator. d/dx finds the slope of a function at a point, written d/dx(f(x), a). The ∫dx key finds a definite integral, written ∫(f(x), a, b). Use the x key for the variable and the comma key between the parts.

d/dx(x², 3) = 6   ∫(x², 0, 3) = 9
In RAD mode, ∫(sin(x), 0, π) = 2.

These are worked out numerically, accurate to about 10 significant figures, which is more than enough for checking homework and engineering estimates.

History and copying

Open History to see your last 20 calculations. Tap one to bring the calculation back, or to use its answer in a new sum. The history is kept only in your own browser. The copy button puts the answer on your clipboard so you can paste it anywhere.

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Frequently Asked Questions

How do I use the scientific calculator?

Type the whole calculation, using brackets where needed, then press = or Enter. The calculator follows the usual order of operations, so 2 + 3 × 4 = 14 and (2 + 3) × 4 = 20.

What is a scientific calculator?

A scientific calculator has the everyday keys plus extra ones for trigonometry (sin, cos, tan), logarithms, powers, roots, factorials, brackets and scientific notation. It is used for school maths, science and engineering.

Why does sin(30) not give 0.5?

The calculator is probably set to radians. Choose DEG at the top of the calculator and sin(30) gives 0.5. In radians, sin(30) is about −0.988, because 30 radians is a different angle from 30 degrees.

What is the difference between degrees and radians?

They are two ways to measure an angle. A full turn is 360 degrees or 2π radians. School geometry mostly uses degrees, and calculus and physics formulas usually use radians. Set DEG or RAD at the top of the calculator.

How do I find sin, cos and tan?

Press the sin, cos or tan key, type the angle, close the bracket and press =. In degrees, sin(30) = 0.5, cos(60) = 0.5 and tan(45) = 1. The sin⁻¹, cos⁻¹ and tan⁻¹ keys work the other way and give you the angle.

How do I calculate a logarithm with a different base?

Enter the base, press the logₐx key, then enter the number and press =. For example, 2 logₐ 8 = 3, because 2³ = 8.

How do I find a square root, a cube root or any other root?

Use √x for a square root (√144 = 12) and ³√x for a cube root (³√27 = 3). For any other root, enter the root, then ʸ√x, then the number: 4 ʸ√ 81 = 3.

How do I use scientific notation (EXP)?

Type the number, press EXP, then the power of ten. 6.02 EXP 23 is 6.02 × 10²³, and 5 EXP 3 is 5,000. A negative power gives a small number: 3 EXP −2 is 0.03.

How do I calculate a factorial?

Type the number and press x!. 5! = 5 × 4 × 3 × 2 × 1 = 120, and 10! = 3,628,800.

Does it follow the order of operations?

Yes. Brackets come first, then functions and powers, then multiplication and division, then addition and subtraction. So 2 + 3 × 4 = 14, and −2² = −4.

Can it do derivatives and integrals?

Yes. Use d/dx(f(x), a) for the slope at x = a, and ∫(f(x), a, b) for the definite integral from a to b. For example, d/dx(x², 3) = 6 and ∫(x², 0, 3) = 9.

Can I use my keyboard?

Yes. Click the calculator once, then type numbers, + − * / ^, brackets, % and !. Press Enter for equals, Backspace to delete and Esc to clear.

Is my history saved?

Your last 20 calculations are kept in your own browser so you can see them next time. They are never sent to a server, and you can clear them at any time from the History panel.

Is there a simpler version?

Yes. Open the Simple Calculator for a plain keypad with just the everyday keys: numbers, the four operations, percent and delete.