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.

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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, or "AC" to clear it and start over.
  5. Click the history icon above the display to view and reuse past calculations.

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.

The display turns red and shows "Error" - for example, if the expression is malformed or involves division by zero. Press "AC" to clear it and try again.

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.

Yes, it's completely free and requires no sign-up.
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