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Free Online Calculator

Fast, accurate maths right in your browser — no download, no login, no cost.

Online Calculator

M:

Tap buttons or use your keyboard

What Is This Calculator?

The Online Calculator is a free, browser-based tool built for speed and precision. It handles everyday arithmetic — addition, subtraction, multiplication, division — and goes further with percentages, parentheses, powers (2^8), square roots (√(144)), and mathematical constants like π and e. Every calculation runs entirely in your browser — nothing is ever sent to a server.

How to Use

  1. 1 Enter a number — type on your keyboard or tap the buttons.
  2. 2 Choose an operator — +, −, ×, ÷, %, or advanced like ^ and √(.
  3. 3 Press = or Enter — get your result instantly, saved to History.

Key Features

  • Memory functions — MC, MR, M+, M− to store values mid-calculation
  • Calculation history — last 10 results saved and clickable to reuse
  • Full keyboard support — type expressions; Enter to calculate, Esc to clear
  • Scientific panel — x², 1/x, π, e, parentheses and more
  • One-tap copy — copy any result to clipboard instantly
100% Free
No sign-up, no subscription, no hidden cost. Use it as often as you like.
Private & Secure
All calculations run locally in your browser. Nothing is sent to our servers.
Works Everywhere
Optimised for desktop, tablet, and mobile. No app download required.
Try it yourself

Common Calculation Examples

Type any of these expressions into the calculator above

Tip Calculator
85 × 15%
→ 12.75 15% tip on $85
Split a Bill
247.50 / 4
→ 61.875 $247.50 ÷ 4 people
Area of Circle
π × 5^2
→ 78.5398 radius = 5 units
Percentage Change
(180 - 150) / 150 × 100
→ 20 20% increase
Compound Interest
1000 × (1 + 0.05)^10
→ 1628.89 5% over 10 years
Pythagorean Theorem
√(3^2 + 4^2)
→ 5 hypotenuse of 3-4-5
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Quick Reference

Keyboard Shortcuts & Formulas

⌨ Keyboard Shortcuts

EnterCalculate result
EscClear all (AC)
BackspaceDelete last character
^Power (e.g. 2^10 = 1024)
√(Square root (e.g. √(16) = 4)
%Percentage (50% = 0.5)

Essential Maths Formulas

A = π × r² Area of a circle (r = radius)
c = √(a²+b²) Pythagorean theorem (hypotenuse)
A = P(1+r)ⁿ Compound interest (P = principal, r = rate, n = years)
% = Δ/old×100 Percentage change
V = (4/3)πr³ Volume of a sphere
🧠 Math Fact of the Day

🏆 Achievements

Earn badges as you explore our tools. Use the loan calculator, convert currencies, check your BMI — each action unlocks a reward.

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FAQ

Frequently Asked Questions

Yes, entirely. There are no fees, no subscription tiers, no registration, and no download required. The Online Calculator is free to use as many times as you need.
Yes. The interface is fully responsive and sized for touch input. Button targets, text, and spacing automatically adapt to any screen — phone, tablet, or desktop.
To find 15% of 200, type 200 × 15% and press Enter — result: 30. For more options, visit our dedicated Percentage Calculator.
Absolutely. Click the display or just start typing. Use standard keyboard characters: 0–9, +, −, *, /, (, ), ^, %. Press Enter to calculate, Backspace to erase, Escape to clear.
Yes. Everything runs locally in your browser using JavaScript. No expressions, numbers, or results are ever sent to a server. Your history is stored only in browser localStorage and can be wiped at any time.
Use ^ for powers — e.g. 2^10 = 1024. Use √( for roots — e.g. √(144) = 12. You can also use the x² and √ buttons in Scientific Functions.
M+ adds the current result to memory, M− subtracts it, MR inserts the stored value into your expression, and MC clears the memory. Handy for multi-step problems.
Yes. Type full mathematical expressions with multiple operators and parentheses — e.g. (25 + 75) / 4 × π. The calculator follows standard order of operations (BODMAS/PEMDAS).
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