100 ft = 1200 in (foot → inch)
100 ft = 1200 in
100 feet (ft) equals 1200 inches (in). The conversion uses the exact factor 12: 100 × 12 = 1200.
Inches = Feet × 12How 100 feet compares to its arithmetic neighbours, converted to inches.
| Relation | feet | inches |
|---|---|---|
| ÷10 | 10 ft | 120 in |
| ÷2 (half) | 50 ft | 600 in |
| ×1 (this value) | 100 ft | 1200 in |
| ×2 (double) | 200 ft | 2400 in |
| ×5 | 500 ft | 6000 in |
| ×10 | 1000 ft | 12000 in |
Feet to inches multiplies by 12 — 1 ft = 12 in by definition. A 6 ft adult is 72 in; an 8 ft ceiling is 96 in. The factor of 12 is exact and the conversion is the backbone of the US feet-and-inches height format. When a height is given as 5'10", that is 5 × 12 + 10 = 70 in total; flatten to all-inches before doing any further arithmetic, then convert back to feet-and-inches only for display.
Contractors framing a door opening work from a feet-and-inches dimension on the plan but the rough-opening tolerance called out by the door manufacturer is specified purely in inches. A 6 ft 8 in standard door height is 80 in exactly, and the manufacturer's typical 0.5 in tolerance either side means the actual rough opening must land between 79.5 in and 80.5 in. Convert the full feet-and-inches figure to a single inch number before checking it against any manufacturer tolerance table — mixed units are where installation errors creep in.
Start with your value in feet.
Multiply the foot value by 12. This is the exact conversion factor from feet to inches.
The product is your value in inches. For example, 5 ft × 12 = 60 in.
The exact factor from feet to inches is 12.
Inches = Feet × 12
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Feet (ft) | Inches (in) |
|---|---|
| 0.1 ft | 1.2 in |
| 0.25 ft | 3 in |
| 0.5 ft | 6 in |
| 1 ft | 12 in |
| 2 ft | 24 in |
| 3 ft | 36 in |
| 4 ft | 48 in |
| 5 ft | 60 in |
| 6 ft | 72 in |
| 7 ft | 84 in |
| 8 ft | 96 in |
| 9 ft | 108 in |
| 10 ft | 120 in |
| 11 ft | 132 in |
| 12 ft | 144 in |
| 13 ft | 156 in |
| 14 ft | 168 in |
| 15 ft | 180 in |
| 16 ft | 192 in |
| 18 ft | 216 in |
| 20 ft | 240 in |
| 22 ft | 264 in |
| 24 ft | 288 in |
| 25 ft | 300 in |
| 28 ft | 336 in |
| 30 ft | 360 in |
| 32 ft | 384 in |
| 36 ft | 432 in |
| 40 ft | 480 in |
| 45 ft | 540 in |
| 48 ft | 576 in |
| 50 ft | 600 in |
| 60 ft | 720 in |
| 70 ft | 840 in |
| 75 ft | 900 in |
| 80 ft | 960 in |
| 90 ft | 1080 in |
| 100 ft | 1200 in |
| 125 ft | 1500 in |
| 150 ft | 1800 in |
| 200 ft | 2400 in |
| 250 ft | 3000 in |
| 300 ft | 3600 in |
| 400 ft | 4800 in |
| 500 ft | 6000 in |
| 600 ft | 7200 in |
| 750 ft | 9000 in |
| 800 ft | 9600 in |
| 900 ft | 10800 in |
| 1000 ft | 12000 in |
The average adult man in the US is about 5 ft 9 in tall. A standard interior ceiling is around 8 ft high. An NBA basketball hoop is 10 ft above the floor. In inches, that gives you: 1 ft = 12 in, 10 ft = 120 in, 100 ft = 1200 in.
The foot (ft) is a unit of length in the imperial and US customary systems, defined as exactly 0.3048 meters (12 inches). It is the everyday unit for human height, room sizes, and short distances in the United States. Five-thousand-two-hundred-and-eighty feet make one mile.
The inch (in) is a unit of length in the imperial and US customary systems, defined as exactly 25.4 millimeters since the 1959 international yard and pound agreement. It is the standard unit in the US for screen sizes, lumber, fasteners, and personal height when given in feet-and-inches form. Twelve inches make one foot.
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