Area of a Triangle SSS Calculator Heron's formula alias. a b c Area 14.697 Step-by-step with your numbers: 1. Values used: 2. a = 5 3. b = 6 4. c = 7 5. Area = 14.697 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! Heron's formula for three sides. FAQ Valid? Must satisfy triangle inequality. Related calculators Heron's Formula Calculator Find a triangle's area from its three sides. Triangle Area Calculator Find a triangle's area from its base and height.