Tool
Feet & Inches Calculator
A field calculator for feet, inches, and fractions. Tap the keys like a construction calculator — add and subtract lengths, find area, or convert to decimal feet.
Feet & Inches
LENGTH
0
Length: enter numbers, tap Feet or Inch, use / for fractions (e.g. 6 Inch 1 / 2), then + − × =.
Area: tap Area or Sq, enter length, tap ×, enter width, tap = for square feet.
Convert: tap Conv or Dec to switch decimal feet and feet-inches.
Engineering disclaimer
Results are for preliminary engineering only. Final designs must be reviewed by a licensed fire protection engineer and verified against NFPA 13/14 and the local AHJ.