Feet to Inches (ft to in) Converter
Use this feet to inches converter to instantly convert ft to in with accurate results. Enter a length in feet, adjust decimal precision, and get the equivalent inches value immediately.
This converter uses the exact formula in = ft × 12. There are exactly 12 inches in a foot — no rounding, no estimation. This makes feet-to-inches one of the cleanest conversions in everyday measurement, essential for height comparisons, construction work, and product sizing.
Formula used: in = ft × 12
Need to convert inches to feet? Try our Inches to Feet Converter.
Feet to Inches Formula
To convert feet to inches, multiply by 12.
Formula: in = ft × 12
For example, 5.5 ft × 12 = 66 inches.
This is an exact conversion — 1 foot is defined as exactly 12 inches within the imperial and US customary systems. There is no rounding error. The relationship goes back to ancient measurement systems and has been codified in US law. For fractional feet (like 5.75 feet for 5 feet 9 inches), the multiplication still works perfectly: 5.75 × 12 = 69 inches.
How to Convert Feet and Inches Together
When a measurement is given as feet-and-inches (like 6'2"), convert the feet component first, then add the inches. For example: 6 ft 2 in = (6 × 12) + 2 = 72 + 2 = 74 total inches. To express as decimal feet first, divide the inches by 12 and add: 6 + (2 ÷ 12) = 6.1667 ft, then × 12 = 74 in. Both methods give the same result.
Common Heights: Feet to Inches
- 4 ft 0 in = 48 in
- 5 ft 0 in = 60 in
- 5 ft 6 in (5.5 ft) = 66 in
- 5 ft 10 in = 70 in
- 6 ft 0 in = 72 in
- 6 ft 6 in (6.5 ft) = 78 in
Feet to Inches Conversion Table
| Feet (ft) | Inches (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 |
| 10 ft | 120 in |
| 12 ft | 144 in |
When to Convert Feet to Inches
Height and medical records: Many medical forms, health apps, and fitness tracking platforms record height in total inches rather than feet-and-inches notation. A person who is 5 feet 8 inches tall is 68 inches — a single number that's easier to store in databases and compare mathematically. When calculating BMI, for example, height in inches is squared directly in the formula.
Construction and carpentry: Working drawings sometimes express room dimensions in feet while material lists use inches. A 9-foot ceiling is 108 inches. Knowing the total-inch measurement lets tradespeople order the right lengths of lumber, pipe, conduit, or trim without on-site calculation errors.
Clothing and tailoring: Inseam, sleeve length, and chest measurements are expressed in inches. A tailor working from a height in feet converts to inches first to maintain consistent units across a measurement chart. A 6-foot inseam is 72 inches — clearly too long, which would immediately flag an input error.
Screen and display sizing: Television and monitor screens are measured diagonally in inches. If you know a room dimension in feet, converting to inches lets you match the right screen size. A 10-foot viewing distance is 120 inches — guidelines suggest a screen diagonal of 40–50% of viewing distance, or roughly 48–60 inches.
Sporting equipment and fields: Many sporting regulations specify dimensions in feet but equipment specs come in inches. A basketball hoop at 10 feet equals exactly 120 inches above the floor. A standard pool table is 4.5 ft × 9 ft, which is 54 × 108 inches — the inch format is used for pocket size specifications and cloth dimensions.
FAQ
How many inches is 5 feet?
5 feet = exactly 60 inches. This is the most commonly used reference in height-related conversations — "5 feet" or "60 inches" describe exactly the same measurement.
How many inches is 6 feet?
6 feet = exactly 72 inches. This is the benchmark for "6-foot" items like standard interior doors (which are typically 6 ft 8 in = 80 inches tall) and average basketball player comparisons.
How many inches is 5 feet 10?
5 feet 10 inches = 70 total inches. This is calculated as (5 × 12) + 10 = 60 + 10 = 70. It's the average height for adult males in the US according to CDC data.
How many inches is 4 feet?
4 feet = 48 inches. This is the standard counter height in kitchens and the minimum height for most amusement park rides, which is why it's frequently searched by parents.
Is the conversion always exact?
Yes. 1 foot = 12 inches by definition in both the imperial and US customary systems. There is no approximation involved — multiplying by 12 will always give an exact result, and any decimal in the output reflects only the precision of the original feet measurement you entered.
How do I convert 5'7" to total inches?
(5 × 12) + 7 = 60 + 7 = 67 inches. This works for any feet-and-inches measurement: multiply the feet by 12, then add the remaining inches.