Inverse Modulo Calculator Find x where a·x ≡ 1 (mod m). a m a⁻¹ mod m 5 Step-by-step with your numbers: 1. Values used: 2. a = 3 3. m = 7 4. a⁻¹ mod m = 5 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! Modular multiplicative inverse. FAQ When? Only exists if a and m are coprime. Related calculators Modulo Calculator Find the remainder and quotient of a division. GCF Calculator Find the greatest common factor of two numbers. Prime Number Calculator Check whether a number is prime.