Angle Calculator

Use our free angle calculator to find the missing angle in a triangle, or compute complementary (90° - θ) and supplementary (180° - θ) angles.

Math

Type

Angle θ

Angle B (for triangle mode)

Formula

Find the missing angle in a triangle given two angles, or compute complementary (90° - θ) and supplementary (180° - θ) angles.

Varies by mode: 180 - A - B, 90 - θ, or 180 - θ

Percentage: The percentage value you want to apply

Number: The original number or value

Result: The calculated result

How It Works

1Select the type of angle calculation.
2Enter the known angle(s).
3Click Calculate.

Examples

Triangle: A=50°, B=60°

1.C = 180 - 50 - 60 = 70°

Result: 70.0000°

Complement of 30°

1.90 - 30 = 60°

Result: 60.0000°

Supplement of 110°

1.180 - 110 = 70°

Result: 70.0000°

Frequently Asked Questions

Two angles whose sum is 90°.

Two angles whose sum is 180°.

The sum of all three interior angles is always 180°.

Yes, but typical geometry uses angles between 0° and 180°.

Use triangle mode with at least two angles, or use complement/supplement.

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CalculateMe Team

Last updated: 2026-07-14

Angle Calculator

Formula

How It Works

Examples

Triangle: A=50°, B=60°

Complement of 30°

Supplement of 110°

Frequently Asked Questions

What are complementary angles?

What are supplementary angles?

Triangle angle sum?

Can angles be negative?

What if I only know one angle?

Related Calculators

Angle Calculator

Formula

How It Works

Examples

Triangle: A=50°, B=60°

Complement of 30°

Supplement of 110°

Frequently Asked Questions

What are complementary angles?

What are supplementary angles?

Triangle angle sum?

Can angles be negative?

What if I only know one angle?

Related Calculators