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WAVESPEED AI ONLINE CALCULATOR Works in your browser
100% FREE

Free Online CalculatorBig keys, a running tape and memory, right in your browser.

Add, subtract, multiply and divide with large keys or your keyboard, and keep every calculation on a tape you can copy.
Percent works like a desk calculator, memory keys keep a running total, and full-screen mode turns your phone into a calculator.

Calculation tapeMemory keysFull keyboard
No sign-up Unlimited use Remembers your numbers
0
Calculated on your device. What you type is not sent anywhere.
THREE SIMPLE STEPS

How to use the online calculator

01

Type or tap

Press the keys or type on your keyboard: digits, + − * /, Enter for =, Backspace to delete a digit and Esc to clear.

02

Read the answer

The answer shows in large digits, and the line above it shows what you entered. Press = again to repeat the last step.

03

Keep your results

Every answer goes on the tape. Tap one to use it again, add it to memory with M+, or copy the whole tape.

Worked examples

Add sales tax

A jacket costs $80 and sales tax is 8.25%. What do you pay?

  1. Press 80 + 8.25 %.
  2. The percent key turns 8.25% into 8.25% of 80, which is 6.6.
  3. Press = to add it.

= 86.6 – you pay $86.60.

Split a bill

Dinner is $146.40 and you add a 15% tip. How much does each of 4 people pay?

  1. Press 146.4 + 15 % = to get 168.36.
  2. Then press ÷ 4 =.

= 42.09 each.

A running total with memory

Add up three items: 3 × $4.50, 2 × $7.25 and 1 × $12.

  1. Press 3 × 4.5 = then M+.
  2. Press 2 × 7.25 = then M+, and 12 then M+.
  3. Press MR to see the total.

MR shows 40 – the items cost $40.00.

How the keys work

2 + 3 × 4 = 14 (× and ÷ before + and −)200 + 10% = 220 80 − 25% = 60 50 × 10% = 52 + 3 = = = → 5, 8, 11

Multiplication and division are worked out before addition and subtraction, as on phone calculators. The line above the answer shows the whole calculation so far.

After + or −, percent means a share of the number before it, like a desk calculator; after × or ÷ it simply divides by 100. Answers are rounded to 15 significant digits, so 0.1 + 0.2 shows 0.3.

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$1 in free credits for eligible new accounts. No card needed. Generators have separate account and credit requirements. The online calculator is free.

Online Calculator FAQ

Can I use my keyboard?

Yes. Type digits and + − * /, press Enter or = for the answer, Backspace to delete the last digit, Delete to clear the entry and Esc to clear everything. % is percent, N changes the sign, S is square root, Q squares and R takes the reciprocal. Ctrl+C copies the answer and Ctrl+V pastes a number.

How does the percent key work?

Like a desk calculator. 200 + 10% gives 220 and 80 − 25% gives 60, because the percent is a share of the number before it. 50 × 10% gives 5, and 50% on its own gives 0.5.

What is the tape?

A paper-style list of every calculation you finish with =. Tap a result to bring it back, copy the whole tape as text for a note or an email, or clear it. It stays in your browser for next time.

How do the memory keys work?

M+ adds the number on screen to memory and M− subtracts it. MR brings the memory back and MC clears it. The memory is kept in your browser, so a running total survives a page reload.

Does it follow the order of operations?

Yes. 2 + 3 × 4 gives 14, not 20, like phone calculators. For brackets, powers, trigonometry and logarithms, use the scientific calculator.

Can I use it full screen on my phone?

Yes. Tap the full-screen button above the display: the keypad fills the screen with large keys, like a calculator app. Tap it again or press Esc to go back.

Is it free?

Yes. Free, no sign-up, no limits, and it works offline once the page has loaded.

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Big keys, a tape you can copy and memory that remembers.

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