Right Triangle Calculator

Instant special right triangle calculator for 30-60-90 and 45-45-90 triangles.

Enter just one side — get all sides, area and perimeter immediately.

Works offline. No formulas needed.

This right triangle calculator supports both special right triangles:

- 30 60 90 Triangle Calculator

- 45 45 90 Triangle Calculator — also known as isosceles right triangle calculator

Key Features:

- Instant auto-calculations — results appear as you type

- Right triangle solver: find any missing side of triangle

- Area of triangle calculator — area and perimeter in one tap

- Clear visual of the triangle with labeled angles and sides

- Calculation history — save and share your results

- Dark and Light themes

- Multi-language: English, Русский and more

- Works offline — no internet required

Perfect for:

- Students studying geometry, trigonometry and special right triangles

- Teachers demonstrating 30 60 90 and 45 45 90 triangle properties

- Engineers, architects, carpenters, builders and DIY enthusiasts

- Anyone needing a right angle triangle calculator on the go

Whether you need a triangle calculator, right triangle calculator,

30 60 90 triangle calculator, 45 45 90 triangle calculator,

special right triangle calculator, isosceles triangle calculator,

area of a triangle calculator or a tool to find the missing side

of a triangle — this app solves it instantly.

Download now. Get accurate results in seconds!

We appreciate your feedback and suggestions.