Work out measurements for your next cut, layout or material estimate. Inch Plus is a feet and inches calculator for woodworking, construction and DIY, with mixed-fraction arithmetic, metric conversion and tools for materials, plumbing and electrical work.

Calculate with the units you use
• Add, subtract, multiply and divide fractions and mixed numbers.
• Enter each measurement in its own unit: inches, feet and inches, decimal feet, yards, millimeters, centimeters or meters.
• Combine imperial and metric measurements in the same calculation.
• Multiply lengths to find an area, or divide a length by a number to find equal parts.
• View length answers as fractional inches, feet and inches, decimal feet or metric units.

Round answers for your tape measure
• Keep the exact result or round to the nearest 1/8, 1/16, 1/32 or 1/64 inch.
• Copy an answer or use it in your next calculation.
• Save up to 30 calculations and reopen them with their units and rounding settings.

Convert measurements
• Switch between imperial and metric length, area and volume units.
• Convert temperature between Celsius and Fahrenheit.
• Convert slope and pitch between rise per 12 run, percent and angle.

Plan materials and trade work
• Lumber: calculate board feet from actual dimensions and piece count.
• Waste allowance: add a percentage to your measured quantity.
• Plumbing: calculate water volume inside a full pipe; solve drain fall, slope or run; and find simple or rolling pipe offsets with fitting deductions.
• Electrical: work out EMT offsets and saddles, conduit size and fill, box fill, and voltage-drop estimates. Calculate volts, amps or watts for DC, single-phase AC and balanced three-phase AC.

Use it in the workshop or on site
• Calculations work offline, with no account required.
• No advertising or analytics. Saved calculations stay on your device.
• Choose light or dark appearance.
• Available in English, Spanish, French and Russian.

Trade tools support planning and calculation. They do not replace applicable codes, manufacturer instructions or professional judgment. Check inputs, tool assumptions and results before cutting or installing; electrical power calculations do not size conductors or protective devices.