Math
Right Triangle Trig Calculator
Use this right triangle trig calculator to connect opposite, adjacent, and hypotenuse sides with SOH-CAH-TOA.
Angle
—
- Hypotenuse
- —
- Sine
- —
- Cosine
- —
- Tangent
- —
Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
Use this calculator with
Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
What the right triangle trig calculator solves
Use this right triangle trig calculator to connect opposite, adjacent, and hypotenuse sides with SOH-CAH-TOA.
Formula
How to use it
- Enter opposite and adjacent side lengths.
- The calculator finds the hypotenuse.
- Read the trig ratios and angle.
How to read the answer
The angle is measured from the adjacent side toward the hypotenuse.
Common mistakes and edge cases
- Label sides relative to the angle you care about.
- Only use SOH-CAH-TOA for right triangles.
- Calculator trig mode should match degrees or radians.
Worked examples
3-4-5 triangle
Angle
36.8699 deg
Steeper triangle
Angle
74.0546 deg
Frequently asked questions
Where is the angle?+
It is the acute angle next to the adjacent side and across from the opposite side.
Can this solve non-right triangles?+
No. Use law of sines or law of cosines for non-right triangles.
What if I know hypotenuse instead?+
You can still use SOH-CAH-TOA by matching the known sides to sine, cosine, or tangent for the angle you need.
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Last updated: May 15, 2026