Right Triangle Solver

Use our free right triangle solver to find all sides (a, b, c) and angles (A, B) of a right triangle. Enter any two known values.

Math

What You Know

Side a (opposite A)

Side b (opposite B)

Hypotenuse (c)

Angle A (acute)

Angle Output Unit

Formula

A right triangle has one 90° angle. Enter any two known values (two sides or a side and an acute angle) to find all sides and angles.

a² + b² = c², Angles sum to 90°

Percentage: The percentage value you want to apply

Number: The original number or value

Result: The calculated result

How It Works

1Select what you know (leg-leg, leg-hypotenuse, or leg-angle).
2Enter the known values.
3Choose angle output unit.
4Click Calculate.

Examples

Legs 3 and 4

1.c=√(3²+4²)=5
2.A≈36.87°, B≈53.13°

Result: 5.0000

Leg 3, Hypotenuse 5

1.b=√(5²-3²)=4
2.A=arcsin(3/5)≈36.87°

Result: 5.0000

Frequently Asked Questions

A triangle with one 90° angle.

a² + b² = c², where c is the hypotenuse.

Any two values (sides or a side + angle).

Only the values relevant to the selected mode are used.

A is opposite side a, B opposite side b. A + B = 90°.

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CalculateMe Team

Last updated: 2026-07-14

Right Triangle Solver

Formula

How It Works

Examples

Legs 3 and 4

Leg 3, Hypotenuse 5

Frequently Asked Questions

What is a right triangle?

What is the Pythagorean theorem?

How many inputs needed?

What if I enter all fields?

What are angles A and B?

Related Calculators

Right Triangle Solver

Formula

How It Works

Examples

Legs 3 and 4

Leg 3, Hypotenuse 5

Frequently Asked Questions

What is a right triangle?

What is the Pythagorean theorem?

How many inputs needed?

What if I enter all fields?

What are angles A and B?

Related Calculators