Formula and calculation method
Hypotenuse = √(a²+b²). Area = ab/2. Angle opposite a = atan(a/b).
Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.
How to use right triangle calculator
- Set Leg a. The example below uses 3.
- Set Leg b. The example below uses 4.
- Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.
Worked example
Example inputs
- Leg a
- 3
- Leg b
- 4
- Hypotenuse
- 5
- Area
- 6
- Angle opposite a (degrees)
- 36.86989765
- Angle opposite b (degrees)
- 53.13010235
Factors affecting your result
Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.
Changing leg a changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.
Frequently asked questions
How does the right triangle calculator work?
Hypotenuse = √(a²+b²). Area = ab/2. Angle opposite a = atan(a/b).
What inputs does Right Triangle Calculator need?
Enter leg a, leg b. Choose values that correspond to the same situation and measurement convention.
How should I interpret the right triangle calculator result?
Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.
Are my right triangle calculator inputs uploaded?
No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.
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