Online Calculator

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About Online Calculator

Free Online Scientific Calculator

This calculator supports basic arithmetic and scientific calculations. All data is processed locally in your browser — nothing is uploaded to any server, fully protecting your privacy.

Features

  • Basic arithmetic: addition, subtraction, multiplication, division, percentage
  • Scientific calculations: trigonometry, logarithms, exponents, powers, factorials
  • Hyperbolic functions: sinh, cosh, tanh
  • Inverse trigonometric functions: asin, acos, atan
  • History: saves up to 50 calculations with favorites
  • Dual themes: flat/skeuomorphic style toggle
  • Pure frontend offline processing, protects user privacy

How to Use

  1. 1Select Basic or Scientific mode
  2. 2Click buttons or use keyboard to enter expressions
  3. 3Press = or Enter to calculate
  4. 4View or recall previous calculations from History

FAQ

What calculations are supported?
Arithmetic, trig, inverse trig, log, power, sqrt, factorial.
Is keyboard input supported?
Fully supported: number keys and +-*/ directly, Enter calculate, Esc clear.
How accurate is the calculation?
Based on decimal.js high-precision engine, arbitrary precision, no floating errors.
Is there calculation history?
Yes, all calculations auto-saved to history, viewable and recallable anytime.
Does it support scientific notation?
Yes, auto-switches to scientific notation for large/small results, e.g. 1.5e+10.

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