Modulo Calculator - Find Modulo of Two Numbers

Last Updated : 9 Mar, 2026

The Modulo calculator is a free online tool to calculate the Modulo (Dividend % Divisor).

Steps to use Modulo Calculator

Step 1: Enter the Dividend

  • Type the dividend value (the number to be divided) in the Dividend input field.

Step 2: Enter the Divisor

  • Enter the divisor value (the number you want to divide by) in the Divisor input field.

Step 3: Click the Calculate Button

  • Press the Calculate button to compute the modulo operation.

Step 4: View or Copy the Result

  • The result will appear below the buttons.

Modulo

  • The modulo operation finds the remainder when the dividend ‘a’ is divided by the divisor ‘b’.
  • Mathematically, it is represented as: (a \mod b = r), where ‘r’ is the remainder.

For example:

If you need to find (13 \mod 5), divide 13 by 5:

(13 \div 5 = 2) with a remainder of 3.

Therefore, (13 \mod 5 = 3).

a % b represents

It is the remainder of a divided by b in a division problem.

a % b = r, where r is the remainder when a is divided by b.

How to Do a Modulo Calculation

The modulo operation finds the remainder of a divided by b. To do this by hand just divide two numbers and note the remainder. If you need to find 13 mod 5, divide 13 by 5.

  • 13 mod 5 = ?
  • 13 ÷ 5 = 2 with a remainder of 3
  • 13 mod 5 = 3

Validate the remainder by using below equation:

Quotient × Divisor + Remainder = Dividend

  • Divide a by b to find the remainder.
  • 13 ÷ 5 = 2 R3, 2 is the dividend and 3 is the remainder
  • Confirm the answer satisfies the equation:
  • Quotient × Divisor + Remainder = Dividend
  • 2 × 5 + 3 = 13

Why Use the Modulo Operation

  • Modulo has various applications, from computer science to engineering.
  • It helps solve day-to-day problems for students and professionals.
  • Whether you’re calculating checksums, handling cyclic patterns, or optimizing algorithms, modulo plays a crucial role.
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