What inputs are needed?

Enter either both legs (a, b) or one leg and the hypotenuse. The calculator finds the missing side and both acute angles in degrees.

How are angles computed?

Angles are found using arctan of the leg ratio; the other angle is 90° minus that.

Solve right triangles: enter two legs or one leg and hypotenuse to get the other side and angles in degrees.

Two legsLeg + hypotenuse

Leg a

Leg b

What inputs are needed?: Enter either both legs (a, b) or one leg and the hypotenuse. The calculator finds the missing side and both acute angles in degrees.
How are angles computed?: Angles are found using arctan of the leg ratio; the other angle is 90° minus that.

Celsius to Fahrenheit Converter

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

Tip Calculator

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

Roman Numeral Converter

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.