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Pinned, kept fixedCalculated

Drag a corner to reshape; angles snap to 15° (hold Alt to move freely)
Arrow keys move a focused corner
Click a value to type it: Enter applies, Esc cancels, ↑ ↓ nudge, Shift ×10
Drag a value sideways to adjust it
Click a pin to keep a value fixed

Drag a corner to reshape; angles snap to 15°
Tap a value to type it, − and + step it
Slide a value sideways to adjust it
Tap a pin to keep a value fixed

Angles

Unit Decimals

Reset

Values

Sides

Angles

Three values stay pinned. Type a new value and it gets pinned too, releasing the oldest pin. Expressions like sqrt(2), 3/4 and decimal commas work.

Triangle calculator for sides, angles and area

Contact

Consumer dispute resolution

Questions and answers