--- title: "How to calculate square footage from inches, with fractions" description: "Multiply length × width in inches and divide by 144 for square feet. Worked examples with feet, inches and fractions, done exactly, and a printable chart." canonical: https://klmlabs.app/construction-calculator/square-feet-from-feet-and-inches/ updated: 2026-11-07 --- # How to calculate square footage from inches and fractions Multiply the length by the width in inches, then divide by 144: 48" × 96" is 4,608 square inches, or 32 square feet. Download the printable chart (PDF, US Letter, 1 page, 29 KB): https://klmlabs.app/construction-calculator/charts/square-feet-from-feet-and-inches.pdf. Every number is worked out by Construction Calculator 1.1.1's own formulas. ## Rooms measured in feet, inches and fractions | Length | Width | Square inches | Square feet | Square yards | Square meters | |---|---:|---:|---:|---:|---:| | 12' 6" | 10' 3" | 18,450 | 128.13 | 14.24 | 11.903 | | 12' 6-1/2" | 10' 3-1/4" | 18,549.13 | 128.81 | 14.31 | 11.967 | | 11' 9" | 13' 2" | 22,278 | 154.71 | 17.19 | 14.373 | | 9' 10-3/4" | 7' 4-1/2" | 10,509.38 | 72.98 | 8.11 | 6.78 | | 15' 3-3/8" | 11' 7-5/8" | 25,603.73 | 177.8 | 19.76 | 16.519 | | 20' 0" | 14' 8" | 42,240 | 293.33 | 32.59 | 27.252 | | 7' 11-1/4" | 5' 2-3/4" | 5,976.94 | 41.51 | 4.61 | 3.856 | Square feet and yards to 2 decimal places, square meters to 3. ## Sizes measured in inches, in square feet | Size (inches) | Square inches | Square feet | Square meters | |---|---:|---:|---:| | 12 × 12 | 144 | 1 | 0.093 | | 18 × 18 | 324 | 2.25 | 0.209 | | 24 × 24 | 576 | 4 | 0.372 | | 12 × 24 | 288 | 2 | 0.186 | | 30 × 60 | 1,800 | 12.5 | 1.161 | | 36 × 80 | 2,880 | 20 | 1.858 | | 48 × 96 | 4,608 | 32 | 2.973 | A square foot is 144 square inches (12" × 12"). ## Why divide by 144? A square foot is 12" × 12", or 144 square inches. Dividing by 144 counts how many fit. ## What about feet, inches and fractions? Turn each side into inches first. A 12' 6" × 10' 3" room is 150" × 123" = 18,450 square inches, or 128.13 square feet. With fractions: 1. 12' 6-1/2" is 150.5" and 10' 3-1/4" is 123.25". 2. 150.5 × 123.25 = 18,549.125 square inches. 3. Divide by 144: 128.81 square feet. ## Is 12' 6" the same as 12.6 feet? No: 12' 6" is 12.5 feet, since 6" is half a foot. Multiplying 12.6 × 10.3 for the 12' 6" × 10' 3" room gives 129.78 square feet instead of 128.13. ## Square yards or square meters? Divide square feet by 9 for square yards, or multiply them by about 0.0929 for square meters. The 12' 6" × 10' 3" room is 14.24 square yards and 11.903 square meters. ## How much do tile, sheets and doors cover? A 12" × 24" tile covers 2 square feet, a 4' × 8' sheet (48" × 96") covers 32, and a 36" × 80" door opening is 20. ## Work out your own with Construction Calculator - Multiply feet-inch-fraction lengths for square feet, exactly - Square yards and metric shown under the answer - Divide an area by a length to get the other side back Download Construction Calculator on the App Store: https://apps.apple.com/us/app/fraction-feet-inch-calculator/id6816445977 Free to download, with in-app purchases. Every feature, the calculator included, needs the free trial or a purchase: Yearly US$9.99 a year with a 7-day free trial for eligible new subscribers, or Lifetime US$19.99 paid once (US prices). iPhone and iPad, iOS 17.0 or later. All the facts: https://klmlabs.app/construction-calculator/ ## The facts this page states, with sources As KLM Labs' fact record words them; the page may put them in its own words. Construction Calculator's facts page: https://klmlabs.app/construction-calculator/ - Add, subtract, multiply and divide feet, inches and fractions exactly, like 5' 7-3/8". (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) - Multiply lengths for square feet, cubic feet and cubic yards. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) - Every length also shows in total inches, decimal feet and metric (cm, mm or m). (Source: the app's source code (private).) - 1 square foot = 144 square inches; 1 inch = 2.54 centimeters exactly. (Source: https://www.nist.gov/document/2026-nist-handbook-44-appendix-c (NIST Handbook 44, 2026, Appendix C; read 2026-11-06).) ## More construction charts - [Fraction to decimal chart: inches, millimeters and feet](https://klmlabs.app/construction-calculator/fraction-decimal-inch-chart/): A fraction to decimal chart for every 64th of an inch, with millimeters and decimal feet, plus inches to decimal feet. Free printable PDF, US Letter. - [How many bags of concrete in a yard?](https://klmlabs.app/construction-calculator/concrete-bags-per-yard/): About 45 bags of 80 lb concrete make a cubic yard, 60 of 60 lb, 90 of 40 lb. A slab chart in yards and bags with 10% waste, as a free printable PDF. - [How to calculate board feet](https://klmlabs.app/construction-calculator/board-feet/): A board foot is 144 cubic inches of lumber, 12" × 12" × 1". How to calculate board feet from nominal sizes, with a printable chart for 1x4 to 6x6. - [Roof pitch chart: degrees, slope and rafter length](https://klmlabs.app/construction-calculator/roof-pitch-chart/): A roof pitch chart from 1/12 to 24/12: the angle in degrees, slope percent, plumb and seat cuts, and rafter length per foot of run. Free printable PDF. - [Stair rise and run code: 7-3/4" risers, 10" treads](https://klmlabs.app/construction-calculator/stair-rise-and-run/): The 2021 IRC limits for stair risers (7-3/4" max) and treads (10" min), the 7-11 rule, and worked stair layouts for rises from 2' to 10'. Free PDF. - [Crown molding angles chart: miter and bevel settings](https://klmlabs.app/construction-calculator/crown-molding-angles/): Miter and bevel settings for 52/38 and 45/45 crown molding cut flat on a compound miter saw, for wall corners from 60° to 150°. Free printable chart. All 7 construction charts: https://klmlabs.app/construction-calculator/guides/ ## Sources 1. [NIST Handbook 44 (2026), Appendix C: 1 square foot = 144 square inches; 1 inch = 2.54 centimeters exactly](https://www.nist.gov/document/2026-nist-handbook-44-appendix-c) 2. [Fraction Feet Inch Calculator (Construction Calculator) on the App Store](https://apps.apple.com/us/app/fraction-feet-inch-calculator/id6816445977) Last updated November 7, 2026.