geometry calculator

Right Triangle Leg Calculator

Right Triangle Leg Calculator for formula verification for 2D and 3D geometry work when you want a fixed formula answer without improvising the math by hand.

Estimate

Enter job values, review the estimate, then use the decision hints before ordering or quoting.

Estimate Results

Enter values to see the result.

Formula

missing leg = sqrt(hypotenuse^2 - known leg^2)

Rearrange the Pythagorean theorem to solve the remaining leg.

The hypotenuse must be at least as large as the known leg.

Example

13 units, 5 units gives Missing Leg 12.

Check

Mixing units, scales, or coordinate conventions across hypotenuse, known leg before calculating missing leg.
Rounding too early when the result still feeds another geometry or algebra step.

Next Step

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Important Use Notice

Informational calculator only. Verify important outputs independently before legal, tax, medical, engineering, safety-critical, contractual, employment, or compliance use.