Triangular Prism Calculator
Find the volume and surface area of a triangular prism from the three sides of its triangular cross-section and its length. The base area comes from Heron's formula.
Inputs explained
- Triangle side a — First side of the triangular cross-section.
- Triangle side b — Second side of the triangle.
- Triangle side c — Third side. The three sides must satisfy the triangle inequality.
- Prism length — Distance between the two triangular faces.
How to use it
- Fill in the fields above — each input has a hint describing exactly what to enter
- Press Calculate to get your result instantly, right on this page
- Copy the result, save the tool to favorites, or share and embed it anywhere
Understanding the result
Example: A prism with a 3-4-5 triangle cross-section and length 10 has volume 60 and total surface area 132.
Frequently asked questions
What happens if the three side lengths I enter can't actually form a triangle? If one side is longer than or equal to the sum of the other two, no valid triangle exists and Heron's formula would produce an invalid (negative or undefined) area, so the calculator cannot return a result.
Does the surface area include the two triangular ends? Yes, the total surface area adds the two triangular end faces (each found via Heron's formula) to the three rectangular side faces running the length of the prism.
Is the Triangular Prism Calculator free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.
Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.
What information do I need? Just the following: Triangle side a, Triangle side b, Triangle side c, Prism length. Each field includes a hint explaining exactly what to enter.
Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.
Privacy
Everything you enter into the Triangular Prism Calculator is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.