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RubanTools

Free Basic Calculator

Add, subtract, multiply and divide — instant results, keyboard support, and a running history of your last 5 calculations.

 
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Built for Everyday Maths

No app to install, no account to create. Open the page, start calculating.

Keyboard-Ready

Type numbers and operators directly from your keyboard. Press Enter for the result and Escape to clear — no mouse needed.

Indian Number Format

Results are displayed in the Indian comma system — 1,00,000 instead of 100,000 — so large numbers are immediately readable.

Calculation History

Your last 5 calculations are shown below the keypad for quick reference — no need to retype or remember previous results.

Three Steps to an Answer

01
Enter a Number

Tap the digit buttons or type on your keyboard. The display updates in real time.

02
Choose an Operation

Press +, −, ×, or ÷. The current number is stored and the display waits for the next input.

03
Press = for the Result

Tap = or press Enter. The result appears instantly and is added to your history.

Everyday Situations

Split a shopping bill between friends
Calculate the discount on a sale price
Work out a tip at a restaurant
Check the change you should receive
Solve school or college arithmetic
Rough EMI or loan interest estimate

Frequently Asked Questions

Yes, completely free. No sign-up, no email, no ads, and no limit on how many calculations you can run.

Yes. The calculator is mobile-first with large tap targets and works on any modern phone, tablet or desktop browser — no app download needed.

Addition (+), subtraction (−), multiplication (×), division (÷), percentage (%), sign toggle (±), and backspace to correct mistakes. Results are shown in Indian number format.

Yes. Type digits (0–9) and operators (+, −, *, /) directly from your keyboard. Press Enter or = for the result, Escape to clear everything, and Backspace to delete the last digit.

Results use the Indian comma system — 1,00,000 instead of 100,000 — so figures like one lakh or one crore are immediately familiar and readable for Indian users.

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