Feet to Inches Converter — Convert ft to in Instantly

About Feet to Inches Conversion

Feet (ft) and inches (in) are U.S. customary length units used across construction, woodworking, furniture design, interior layouts, and height measurement. Converting from feet to inches helps you align measurements with tools, drawings, and cut lists that are marked in inches.

The relationship is simple and exact: 1 foot = 12 inches. Multiply feet by 12 to get inches; divide inches by 12 to get feet. This precision keeps framing, cabinetry, and documentation consistent across teams and projects.

Feet to Inches Formula

Exact relationship

Use the factor method:

inches = feet × 12

Example:

6 ft = 6 × 12 = 72 in

Reverse calculation (in → ft)

Divide by 12: feet = inches ÷ 12.

What is a Foot?

A foot is a U.S. customary unit equal to exactly 12 inches. Feet are commonly used with inches to express room sizes and framing (for example, 10′ 6″). On plans, the prime (′) denotes feet and the double-prime (″) denotes inches.

What is an Inch?

An inch is a U.S. customary unit of length, commonly divided into fractions like 1/2, 1/4, 1/8, and 1/16 on rulers and tapes. It’s widely used in carpentry, manufacturing, and apparel sizing.

Step-by-Step: Converting ft to in

Write the measurement in feet (decimals are fine).
Multiply by 12.
Label the result in inches (in).

Example walkthrough:

Input:  5.75 ft
Multiply: 5.75 × 12 = 69
Output: 69 in

Common Conversions

Handy table for projects & planning

Feet (ft)	Inches (in)
0.5	6
1	12
1.5	18
2	24
3	36
4	48
5	60
6	72
8	96
10	120
12	144

Precision, Rounding & Significant Figures

Everyday rounding

For room sizing and furniture, whole inches or 1/4″ steps are usually fine. This tool displays 5 decimals for precision; round as needed for your application.

Reporting as feet + inches

To express an inch result as feet and inches, divide by 12 to get feet and use the remainder as inches. Example: 69 in → 5 ft 9 in (5′9″).

Use Cases of FT → IN

🏗️ Framing, cabinetry, and trim lengths.
🛠️ Tool fence settings and jig stops.
🏠 Furniture and décor sizing against room plans.
📏 Recording human heights and ergonomic clearances.
📐 Converting specs and drawings that alternate between feet and inches.

Related Length Converters

Quick Reference Table

Feet (ft)	Inches (in)
0.25	3
0.75	9
2.25	27
2.5	30
3.5	42
4.5	54
5.5	66
6.5	78
7.5	90
9	108

Frequently Asked Questions

How do you convert feet to inches?

Use the simple formula: inches = feet × 12. Since 1 foot equals exactly 12 inches, multiplying by 12 converts any foot measurement to inches.

What is 1 foot in inches?

1 foot = 12 inches, exactly.

How many inches is 5.5 feet?

5.5 × 12 = 66 inches.

How many inches is 6 feet?

6 × 12 = 72 inches.

How do I convert feet and inches to total inches (like 5′7″)?

Multiply the feet by 12 and add the remaining inches. Example: 5′7″ → (5 × 12) + 7 = 67 inches.

Can I convert decimal feet to inches?

Yes. Multiply the decimal feet by 12. Example: 5.75 ft × 12 = 69 inches.

Is the feet-to-inches relationship exact everywhere?

Yes. By definition, 1 foot equals exactly 12 inches.

What about the U.S. survey foot?

The survey foot historically differed slightly from the international foot, but for most everyday and design uses the difference is negligible. This tool assumes the international foot.

How precise should I be when converting to inches?

For everyday tasks, whole inches or 1/4″ precision often suffice. For technical work, match your instrument precision and keep significant figures consistent.

Why do U.S. plans and tools use feet and inches?

Feet/inches are part of the U.S. customary system, widely used in construction, architecture, woodworking, and home improvement.

Tips for Working with Inches

On rulers and tapes, track fractional marks (1/2, 1/4, 1/8, 1/16) for accurate layouts.
For saw fences and jigs, consider 1/16″ resolution to reduce cumulative error.
Note the exact factor (12) in project specs so teams don’t introduce rounding differences.