How do I convert Foot (ft) to Inch (in)?

1 ft equals 12 in using SI-based conversion and precise factors.

What is the formula to convert Foot (ft) to Inch (in)?

This is a linear unit conversion using a constant factor between units.

Yes, it uses exact definitions or standardized constants (e.g., 1 in = 25.4 mm).

Use the shareable URL pattern: /convert/ft-to-in/1

Category: Length

Value From To Precision

12 in

1 ft = 12 in

High-precision rounding: 6 decimals

We convert by pivoting through the SI base unit for Length and applying exact factors where applicable.

Share this conversion: /convert/ft-to-in/1

Length measures distance. SI base is the meter; many legacy units survive in trade and navigation.

Foot (ft)

12 inches; exactly 0.3048 m.

History: International foot defined in 1959; older survey feet existed in US mapping.

Inch (in)

Imperial/US customary unit of length; exactly 25.4 mm.

History: Fixed at exactly 25.4 mm by international agreement in 1959.