Modular Complement Calculator

Compute the modular complement: the additive inverse modulo a given modulus.

Description

Compute the modular complement: the additive inverse modulo a given modulus.

Compute the modular complement: the additive inverse modulo a given modulus.

When to use Modular Complement Calculator

Use this calculator to verify a hand calculation, normalize a value before another tool, or make the exact arithmetic convention explicit in a reproducible workflow.

Modulus
An integer input greater than or equal to 1.
Value
An integer input greater than or equal to 0.

How the calculation works

The formula below determines the tool output. Complement: The calculated complement.1

complement = (−value) mod modulus

Limitations and assumptions

Calculations use JavaScript number arithmetic. Binary floating-point representation can make some decimal results inexact, and values outside the supported numeric range can overflow or lose precision. Round only for presentation unless the selected rounding tool is itself the intended operation.

Alternative or Complementary approaches

Use the inverse operation to check a result when one exists: addition pairs with subtraction, multiplication with division, and powers with roots. For rounding or normalization tools, retain the unmodified value when later calculations still require full precision.

References

  1. Modular arithmetic — Wikipedia contributors

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