TopToolAITriangle Calculator
Enter the three sides of a triangle to get its area (using Heron's formula), perimeter, all three angles and its type, or just a base and height for a quick area.
How to use Triangle Calculator
Step-by-step guide to the boxes below. Open it only if you need help.
How to use Triangle Calculator
Step-by-step guide to the boxes below. Open it only if you need help.
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1
Side a Text
Length of the first side. Enter all three sides, or use base and height instead.
Example: 3
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2
Side b Text
Length of the second side.
Example: 4
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3
Side c Text
Length of the third side.
Example: 5
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4
Base (alternative to sides) Text
Alternative: the bottom side of the triangle, if you know its height instead of all three sides.
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5
Height Text
Alternative: the straight-up distance from the base to the top point.
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6
Press “Calculate”
Click the button under the boxes. If something is missing or not valid, a short message tells you which box to fix.
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7
Read your result
Your answer appears under the button, with a short note in plain words where it helps. Change any box and press again to compare different numbers.
Triangle Calculator FAQs
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