Modulo Calculator
Remainder after division.
Enter the values and press Calculate.
How to use Modulo Calculator
Modulo gives the remainder left after dividing a by b. This tool shows the least non-negative result.
Open Modulo Calculator on toolpermarket. It runs entirely in your browser, so you can start without creating an account.
Enter the numbers a and b in the fields above, then press Calculate.
Read the result below the form. Change any input and run it again as many times as you like — the math is instant and local.
Worked example. 17 modulo 5 is 2, because 5 fits into 17 three times with 2 left over.
When to use Modulo Calculator. Use it for wrapping counters, calendar math, or checking divisibility.
Frequently asked questions
Is Modulo Calculator free to use?
Yes. Modulo Calculator runs entirely in your browser. There is no account, no upload, and no cost.
Does Modulo Calculator work on mobile?
Yes. The layout is responsive, so Modulo Calculator works on any phone, tablet, or desktop with a modern browser.
What happens with negative a?
This tool returns the least non-negative remainder, so negative inputs still give a result from 0 up to b minus 1.
Can b be zero?
No. Division by zero is undefined, so the tool asks for a non-zero divisor.