Modulo Calculator
Enter two numbers to find the remainder when the first is divided by the second (A mod B).
Modulo Calculator
Calculate the modulo (remainder after division) of two numbers.
This calculator provides an estimate for general informational purposes only. It is not a substitute for professional financial, mechanical or engineering advice.
The modulo operation returns only the remainder from division, discarding the whole-number quotient — a building block for divisibility checks, cyclic patterns and programming logic.
Example
- With the default values shown above, this calculator returns: A mod B (Remainder) ≈ 2.0000.
Frequently Asked Questions
What is modulo?
Modulo (often written 'mod') gives the remainder left over after dividing one number by another — for example, 17 mod 5 = 2, since 17 = 3×5 + 2.
What is modulo used for?
Modulo is used in programming, scheduling (e.g. 'every 3rd day'), clock arithmetic, and checking divisibility (a mod b = 0 means b divides a evenly).