Scientific Calculator

Use this free online scientific calculator for trigonometry, logarithms, exponents, factorials, and more. Switch between degree and radian modes, use inverse functions, and revisit your past calculations from the built-in history panel - all without installing anything.

0

How to Use the Scientific Calculator

  1. Choose Deg or Rad mode using the toggle at the top for angle-based functions.
  2. Enter numbers using the number pad (0-9) and operators (+, -, ×, ÷, x^y).
  3. Tap function buttons like sin, cos, tan, log, or ln to insert them into your expression; use Inv to switch them to their inverse forms.
  4. Press "=" to evaluate the expression. While you are typing, the "CE" key deletes the last entry (a whole function such as sin( is removed in one press); after a result it becomes "AC" and clears everything.
  5. Click the history icon above the display to view and reuse past calculations.

Order of Operations Used

The whole expression is evaluated when you press "=", following the usual BODMAS order rather than working left to right as you type. From highest priority to lowest:

PriorityOperationsExample
1Brackets and functions such as sin(...), log(...), √(...)2 × (3 + 4) = 14
2Factorial (!) and percent (%) applied to the number before them2 ^ 3! = 2 ^ 6 = 64
3Powers (x^y), evaluated right to left2 ^ 3 ^ 2 = 2 ^ 9 = 512
4Multiplication and division, left to right12 ÷ 3 × 2 = 8
5Addition and subtraction, left to right10 − 4 + 1 = 7

A leading minus sign belongs to the number it is attached to, so −2 ^ 2 gives 4, the square of −2. If you mean "minus two squared", type −(2 ^ 2) to get −4. When in doubt, add brackets: they never hurt.

Worked Example: Loan EMI in One Line

The EMI formula is P × r × (1 + r)^n ÷ ((1 + r)^n − 1), where r is the monthly interest rate and n the number of months. For a ₹10,00,000 loan at 9% a year for 20 years, r = 9 ÷ 12 ÷ 100 = 0.0075 and n = 240. Type 1000000 × 0.0075 × 1.0075 ^ 240 ÷ (1.0075 ^ 240 − 1) and press "=". The result, 8997.2595585, means an EMI of about ₹8,997. The brackets around the denominator are essential; without them the calculator would divide only by 1.0075 ^ 240 and then subtract 1.

Keys That Behave Differently from a Desk Calculator

  • %: simply divides the number before it by 100. 200 + 10% therefore gives 200.1, not 220. To add 10% to 200, type 200 × 1.1 or 200 + 200 × 10%.
  • EXP: inserts "×10^(" for scientific notation. Avogadro's number 6.022 × 10²³ is entered as 6.022, EXP, 23, then a closing bracket.
  • Multiplication must be typed. Write 2 × π, not 2π, and 3 × (4 + 1), not 3(4 + 1); otherwise the expression shows Error.
  • Ans: inserts the last result. After any answer, pressing an operator such as + or × carries on from it automatically, while pressing a number starts a fresh calculation.
  • x!: works for whole numbers from 0 up to 170. Larger factorials exceed the largest number the browser can store and show Error.

Precision and Angle Mode

Answers are shown to 12 significant digits, which cleans up typical floating-point noise: 0.1 + 0.2 displays as 0.3. Very large or very small answers switch to e-notation, where 6.022e+23 means 6.022 × 10²³.

Results that should be exactly zero can appear as a tiny number. In Deg mode, sin(180) shows 1.22464679915e-16 instead of 0, because π cannot be stored exactly; read anything around e-15 or smaller as zero. Similarly, tan(90) returns a huge number rather than an error. Most wrong trigonometry answers come from the wrong mode, so check that Deg is highlighted for angles in degrees and Rad for radians.

Frequently Asked Questions

Use the "Deg" and "Rad" buttons above the keypad. The active mode is highlighted, and it controls how sin, cos, tan, and their inverses interpret angle values.

Inv mode turns the trig and log buttons into their inverses - for example, sin becomes asin, log becomes 10^(, and ln becomes e^( - so you can enter inverse operations with the same keys.

Yes, it keeps your last 10 calculations. Tap the clock icon above the display to open the history panel, then tap any past result to reuse it - or use the "Ans" key to continue from your last answer.

On this calculator the % key only divides the number in front of it by 100, so 10% becomes 0.1 and the sum is 200.1. To increase 200 by 10%, enter 200 × 1.1, or 200 + 200 × 10%, which both give 220.

Use the power key with a fractional exponent: the cube root of 27 is 27 ^ (1 ÷ 3), which gives 3. The √ key handles square roots directly. Fractional powers of negative numbers show Error, so for the cube root of −27 calculate the cube root of 27 and add the minus sign yourself.
5.0 out of 5 (2 ratings)
Rate this calculator:

Related Calculators

Was this tool helpful?