Triangle Area Calculator
Triangle Area Calculator lets you heron’s formula computes area from three side lengths and the semiperimeter. Enter your own values or load the worked example.
- Copy or download the computed result
- Adjust side a
- See the processing method and limits
Method and calculation
Heron’s formula computes area from three side lengths and the semiperimeter.
Inputs and settings
Triangle Area Calculator accepts Side a (minimum 0.000001); Side b (minimum 0.000001); Side c (minimum 0.000001).
Worked example
Triangle Area Calculator example — Side a: 3; Side b: 4; Side c: 5. Computed output: { "area": 6, "perimeter": 12 }
Output and limitations
Triangle Area Calculator: Use finite inputs. Results use double-precision arithmetic.
Technical references: JavaScript numerical operations
Triangle Area Calculator FAQs
Triangle Area Calculator applies the following rule to your input: Heron’s formula computes area from three side lengths and the semiperimeter. The worked example on this page uses the same processor as the result button.
Triangle Area Calculator has these boundaries: Use finite inputs. Results use double-precision arithmetic. Start by checking the side a field against the units or format shown.
Triangle Area Calculator provides this sample: { "area": 6, "perimeter": 12 }. Use the sample button to reproduce it, then replace the inputs with your own values.