Construction Calculator — Feet, Inches, and Fractions

This calculator works the way builders think — in feet, inches, and fractions. Type a number, press FT to mark it as feet, then enter inches and fractions. The display shows your value in native construction format: 14' 3-1/2".

Add, subtract, multiply, and divide directly in feet-inch-fraction format. No converting to decimals first. The result displays in both fraction and decimal format with instant metric conversion.

How to Use

• Enter 14, press FT, enter 3, press IN, press ½ → displays 14' 3-1/2"
• Press +, enter another measurement, press =
• Tap "conversions" to see decimal feet, decimal inches, and metric
• The tape shows your calculation history
• Tap "Specialized calculators" to jump to stair, rafter, beam, and other tools

Why Feet-Inch-Fraction?

Construction in the US uses feet-inches-fractions, not decimals. A wall is 8' 2-3/16", not 98.1875 inches. The Construction Master Pro calculator made its name by letting you work in these native units. This free web calculator does the same thing — no app store, no subscription, works on any phone.