Right Calculator vs Span64 Construction Calculator

Solve any right triangle in seconds — no formulas, no calculator gymnastics. Right Triangle Calculator does the trigonometry for you. Enter any two values — two sides, a side and an angle — and it instantly computes everything else: the missing sides, both angles, and the hypotenuse. It's built for people who measure in the real world, so you can type the way you actually work: feet and inches, fractions, or metric. Whether you're framing a wall, cutting a rafter, laying out stairs, building a deck, or checking homework, the answer is one tap away. REAL-WORLD MEASUREMENTS • Mix feet, inches, and fractions — type "5 ft 3/8 in" directly • Work in metric too — meters and centimeters • Set fraction precision from whole numbers down to 1/64" • Control decimal places for clean, readable results SMART TRIANGLE SOLVER • Enter any 2 of 5 values (sides a, b, c or angles A, B) • Side c is always the hypotenuse, angle C is locked at 90° • Automatic conflict handling — change your mind and it keeps up • Powered by the Pythagorean theorem and trig, done instantly SEE IT, DON'T JUST SOLVE IT • Live diagram redraws as you type • Rotate the triangle to match your layout • Clean, labeled sides and angles you can actually read ARC & CHORD MODE • Switch to curves to solve chord, arc length, and segment height • Perfect for woodworking, masonry, and curved layouts MADE YOUR WAY • Choose label color, label size, and decimal precision • Optional tap sounds • Fast, offline, and distraction-free PERFECT FOR Carpenters • framers • woodworkers • DIY builders • roofers • machinists • students • teachers • engineers • anyone who needs a fast right-angle answer. Just measure, tap, and build.

Exact trade math. Offline. Yours once. Span64 is an exact feet-inch-fraction Calculator for carpenters, framers, contractors, and serious DIYers. Enter full equations, read stacked fractions clearly, convert between imperial and metric, and keep completed work on a persistent Tape. THE CALCULATOR IS FREE The Calculator is free. Jobsite Tools require a one-time unlock. Add, subtract, multiply, and divide dimensions without ads. Calculator equations and results stay available on your Tape so you can reuse or share them later. SPAN64 PRO: SEVEN JOBSITE TOOLS • Triangle / Right-angle • Area & Volume • Concrete • Board Feet • Stairs • Roof / Rafter, including common-rafter birdsmouth • Studs / On-center Preview every locked Tool with your own measurements before purchasing. A single non-consumable purchase reveals useful numeric results and unlocks all seven Tools forever. There is no subscription, trial countdown, or account. BUILT FOR REAL WORK • Exact domain math to 1/64 inch • Tolerant feet-inch input • Imperial and metric output where applicable • Persistent Tape with notes and reuse • Clear stair checks and focused jobsite forms • Works without a signal after installation Purchasing or restoring Span64 Pro requires a network connection so the App Store can verify ownership. Restore Purchases is available from Settings and the Span64 Pro screen. Your measurements, equations, results, Tape entries, and notes stay on your device. Choose whether to share optional PostHog usage analytics and Sentry crash diagnostics during first use, before the optional demo. Both stay off unless you accept. You can change your choice in Settings. Telemetry uses a pseudonymous installation ID and never includes calculation content. Turning sharing off discards pending telemetry; see our Privacy Policy for data already sent and deletion requests. Span64 is a calculation aid. Verify measurements, structural decisions, and local code requirements before cutting or building.