Diagonal & Hypotenuse Calc

The ultimate hypotenuse and geometry calculator built for American construction, carpentry, and DIY — with native feet & inches support. Whether you're squaring up a room, framing a wall, cutting rafter tails, or just figuring out if that 65-inch TV will fit — Diagonal Calculator gives you instant, accurate answers with zero internet required. ✦ What You Can Calculate Right Triangle / Hypotenuse — Enter any two sides, get the third instantly. Perfect for the 3-4-5 rule and any Pythagorean problem. Rectangle Diagonal — Square a room or any rectangular frame with one tap. TV & Screen Size — Find the true screen measurement of any TV, monitor, or display from width and height. Triangle Solver — Sides, angles, area — all solved for right, acute, and obtuse triangles. Square, Parallelogram & More — Full coverage of common shapes. ✦ Built for US Builders & DIYers Native feet and inches fractions input — type 3'5 5/16" just like you'd write it on a job ticket Switch instantly between ft/in, inches, cm, mm, meters, and yards Unit conversion panel covers 15+ units Construction Notation Mode keeps every result in the format you recognize 100% offline — works on every job site, basement, or back yard ✦ Geometry Formulas Built In Square: d = a√2 Rectangle: d = √(l² + w²) Right triangle: c = √(a² + b²) Parallelogram: d = √(a² + b² + 2ab·cosθ) Find side A or B: a = √(c² − b²) ✦ Who Uses This App 🪚 Carpenters & Framers — check square corners, plan cuts, and verify layouts fast 🏗️ General Contractors & Builders — align walls, calculate stair stringers, verify right angles 🏡 Homeowners & DIYers — tile layouts, deck planning, room dimensions — no math degree needed 📺 Electronics Shoppers — verify TV screen size before you buy or mount 🎓 Students & Teachers — visual, interactive tool for Pythagorean Theorem lessons 🏊 Interior & Landscape Designers — plan pools, patios, and large open spaces accurately ✦ Extra Features Calculation history — review every result from today's session Interactive triangle playground to explore angles and side relationships Clean visual diagrams update as you type Fast, lightweight — launches in under a second From squaring a deck to acing geometry class, Diagonal Calculator is the offline measurement tool every American builder, student, and homeowner deserves.