How is monthly payment calculated?

PMT = P × [r(1+r)^n] / [(1+r)^n − 1], with monthly rate r and n = number of months.

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Calculate monthly loan payment. Enter principal, annual interest rate, and term in months.

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How is monthly payment calculated?: PMT = P × [r(1+r)^n] / [(1+r)^n − 1], with monthly rate r and n = number of months.

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Convert Celsius to Fahrenheit and Fahrenheit to Celsius instantly. Free temperature converter.

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Calculate tip and split the bill. Enter bill amount, tip percentage, and number of people.

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Convert numbers to Roman numerals and Roman numerals to numbers. Supports 1–3999.

Combinations Calculator

Calculate C(n,r) — the number of ways to choose r items from n without order. Uses n!/(r!(n-r)!).

Combinations with Replacement Calculator

Calculate the number of ways to choose r items from n with repetition allowed. Formula: C(n+r-1, r).

Even Permutations Calculator

Count how many permutations of n objects are even (expressible as an even number of swaps). For n ≥ 2, equals n!/2.