Math & Scientific
Modulo Calculator
Modulo — it returns the remainder of a ÷ b (a mod b), following the sign of the dividend. This page runs that same calculation on your numbers, in your browser: no signup, no uploads, nothing stored.
Enter your dividend and divisor and Modulo Calculator works out the result with the standard method — fast, free and private, with no sign-up or uploads.
Exact arithmetic accepts up to 4096 digits per number and decimal exponents from −4096 to 4096. Use digit strings for large WebMCP numbers; decimal display is rounded only where labelled.
About this calculator
Get modulo right and the rest of the task gets easier. It returns the remainder of a ÷ b (a mod b), following the sign of the dividend. It matters when you need the exact relationship checked quickly rather than worked through by hand. 17 mod 5 = the remainder after 17 ÷ 5 = 3 remainder 2 . The tool above does the same computation in your browser — free, private, nothing stored.
How to use
- Enter a dividend (a) and a divisor (b).
- Press Calculate to run the modulo calculator.
- Read the result: a mod b, the quotient, and the remainder.
- Press Reset to clear the modulo calculator and start again.
Why use Modulo Calculator
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Accurate
Based on standard, well-established formulas.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Honest disclaimers wherever browser limits or regional rules apply.
Common uses
Use it for homework and assignment checks
Use it when working through problems
Modulo in tutoring and teaching sessions
Modulo in research and report calculations
Use it for quick mental-math cross-checks
Use it when preparing worksheets
Technical notes
Modulo Calculator returns the remainder of a ÷ b (a mod b), following the sign of the dividend.
Inputs are taken exactly as entered, so check for typos before trusting an answer.
Because it runs locally, results appear instantly with no server round-trip.
FAQ
What does modulo do?
It gives the remainder after dividing one number by another — for example 17 mod 5 = 2.
What do I enter in the Modulo Calculator?
A dividend (a) and a divisor (b); the result shows the remainder and the quotient.
What happens if the divisor is zero?
Dividing by zero is not defined, so the calculator asks for a non-zero divisor.
Does the Modulo Calculator send my data to a server?
No — the Modulo Calculator runs entirely in your browser, so the numbers you enter never leave your device.
Worked example
17 mod 5 = the remainder after 17 ÷ 5 = 3 remainder 2.