Inches to Decimal Feet Chart (With Fractions of an Inch)
To turn inches into decimal feet, divide by 12. So 5 inches is 0.4167 ft, 6 inches is 0.5 ft and 8 inches is 0.6667 ft. The charts below cover every inch, every sixteenth of an inch and decimal feet back to a tape measure reading. To add or subtract lengths, use the feet and inches calculator.
Inches to decimal feet (1 to 12 inches)
| Inches | Decimal feet | Millimetres |
|---|---|---|
| 1 in | 0.0833 | 25.4 |
| 2 in | 0.1667 | 50.8 |
| 3 in | 0.2500 | 76.2 |
| 4 in | 0.3333 | 101.6 |
| 5 in | 0.4167 | 127.0 |
| 6 in | 0.5000 | 152.4 |
| 7 in | 0.5833 | 177.8 |
| 8 in | 0.6667 | 203.2 |
| 9 in | 0.7500 | 228.6 |
| 10 in | 0.8333 | 254.0 |
| 11 in | 0.9167 | 279.4 |
| 12 in | 1.0000 | 304.8 |
Half inches to decimal feet
| Length | Decimal feet |
|---|---|
| 1/2 in | 0.0417 |
| 1 1/2 in | 0.1250 |
| 2 1/2 in | 0.2083 |
| 3 1/2 in | 0.2917 |
| 4 1/2 in | 0.3750 |
| 5 1/2 in | 0.4583 |
| 6 1/2 in | 0.5417 |
| 7 1/2 in | 0.6250 |
| 8 1/2 in | 0.7083 |
| 9 1/2 in | 0.7917 |
| 10 1/2 in | 0.8750 |
| 11 1/2 in | 0.9583 |
Fractions of an inch to decimals
Add the decimal for the fraction to the whole inches before you divide by 12. For example 7 3/8 in is 7.375 in, which is 0.6146 ft.
| Fraction | Decimal inches | Decimal feet | Millimetres |
|---|---|---|---|
| 1/16 in | 0.0625 | 0.0052 | 1.59 |
| 1/8 in | 0.1250 | 0.0104 | 3.18 |
| 3/16 in | 0.1875 | 0.0156 | 4.76 |
| 1/4 in | 0.2500 | 0.0208 | 6.35 |
| 5/16 in | 0.3125 | 0.0260 | 7.94 |
| 3/8 in | 0.3750 | 0.0313 | 9.53 |
| 7/16 in | 0.4375 | 0.0365 | 11.11 |
| 1/2 in | 0.5000 | 0.0417 | 12.70 |
| 9/16 in | 0.5625 | 0.0469 | 14.29 |
| 5/8 in | 0.6250 | 0.0521 | 15.88 |
| 11/16 in | 0.6875 | 0.0573 | 17.46 |
| 3/4 in | 0.7500 | 0.0625 | 19.05 |
| 13/16 in | 0.8125 | 0.0677 | 20.64 |
| 7/8 in | 0.8750 | 0.0729 | 22.23 |
| 15/16 in | 0.9375 | 0.0781 | 23.81 |
Decimal feet to inches and fractions
Each value is rounded to the nearest 1/16 inch, which is as close as most tape measures read:
| Decimal feet | Tape measure reading | Decimal inches |
|---|---|---|
| 0.05 ft | 5/8 in | 0.60 in |
| 0.10 ft | 1 3/16 in | 1.20 in |
| 0.15 ft | 1 13/16 in | 1.80 in |
| 0.20 ft | 2 3/8 in | 2.40 in |
| 0.25 ft | 3 in | 3.00 in |
| 0.30 ft | 3 5/8 in | 3.60 in |
| 0.35 ft | 4 3/16 in | 4.20 in |
| 0.40 ft | 4 13/16 in | 4.80 in |
| 0.45 ft | 5 3/8 in | 5.40 in |
| 0.50 ft | 6 in | 6.00 in |
| 0.55 ft | 6 5/8 in | 6.60 in |
| 0.60 ft | 7 3/16 in | 7.20 in |
| 0.65 ft | 7 13/16 in | 7.80 in |
| 0.70 ft | 8 3/8 in | 8.40 in |
| 0.75 ft | 9 in | 9.00 in |
| 0.80 ft | 9 5/8 in | 9.60 in |
| 0.85 ft | 10 3/16 in | 10.20 in |
| 0.90 ft | 10 13/16 in | 10.80 in |
| 0.95 ft | 11 3/8 in | 11.40 in |
How to convert by hand
- Inches to decimal feet: inches ÷ 12. For feet and inches, add the whole feet: 7 ft 8 in is 7 + 8 ÷ 12 = 7.6667 ft.
- Decimal feet to inches: the decimal part × 12. 0.75 ft is 9 in.
- Decimal inches to a fraction: the decimal part × 16, rounded, gives sixteenths. 0.44 in × 16 = 7.04, so 7/16 in.
- Inches to millimetres: × 25.4. One foot is 304.8 mm.
Working out an area or a volume from measurements in feet and inches? Convert each one to decimal feet first, as the area calculator and the board foot calculator do. For adding and subtracting lengths with fractions, read how to add and subtract feet and inches.
Frequently asked questions
How do you convert inches to decimal feet?
Divide the inches by 12. 5 inches is 5 ÷ 12 = 0.4167 ft, 8 inches is 0.6667 ft and 6 inches is 0.5 ft. For a fraction, turn it into a decimal first: 3 1/4 in is 3.25 ÷ 12 = 0.2708 ft.
What is 5 inches in decimal feet?
0.4167 ft (5 ÷ 12), often rounded to 0.42 ft.
How do you convert decimal feet to feet and inches?
Keep the whole feet, multiply the decimal part by 12 for inches, then multiply what is left of that by 16 for sixteenths. 10.37 ft is 10 ft plus 0.37 × 12 = 4.44 in, which is 10 ft 4 7/16 in to the nearest 1/16 inch.
Why do plans use decimal feet?
Survey plans, site levels and spreadsheets work in decimal feet because the numbers add and multiply directly. Tape measures and lumber use feet, inches and fractions, so you convert between the two.
More guides
Estimates only. Quantities depend on your materials, site and supplier. Confirm important numbers before you order, and follow local building codes for anything structural.
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