How many millimeters are in one foot?

One foot is exactly 304.8 millimeters. This is an exact definition — 1 foot = 12 inches, 1 inch = 25.4 mm, so 12 × 25.4 = 304.8 mm.

How do I convert feet to millimeters manually?

Multiply the foot value by 304.8. For example, 3 feet = 3 × 304.8 = 914.4 mm. For fractions, convert first (e.g. 1.5 ft = 1.5 × 304.8 = 457.2 mm).

Can I enter decimal foot values?

Yes. You can enter any decimal value such as 2.75 or 0.5. The converter handles negative values too for offset or delta calculations.

Is the conversion exact or rounded?

The underlying calculation is exact (1 ft = 304.8 mm exactly). The displayed result is rounded to 4 decimal places to keep it readable; no precision is lost for practical use.

What is the difference between feet and millimeters?

Feet are an imperial unit used mainly in the US, UK, and aviation. Millimeters are a metric unit used in most countries and all scientific/engineering contexts. One foot equals 304.8 mm.

Feet to Millimeters Converter

Name: Feet to Millimeters Converter
Availability: InStock
Author: Nham Vu

Enter a length in feet and instantly get the exact equivalent in millimeters.

Feet to Millimeters

Enter a value in feet to get the millimeter equivalent.

Length in Feet

Result in Millimeters

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Conversion factor: 1 ft = 304.8 mm (exact)

Common Conversions

Feet (ft)	Millimeters (mm)

Summary

Enter a length in feet and instantly get the exact equivalent in millimeters.

How it works

Enter a length value in the feet field.
The converter multiplies your input by 304.8 (the exact conversion factor).
The millimeter result appears instantly below the input.
Copy the result with one click or use the quick-reference table for common values.

Use cases

Convert architectural or blueprint measurements from feet to metric millimeters.
Calculate material lengths in mm when sourcing from a metric supplier.
Convert body height from feet to millimeters for engineering clearance specs.
Verify machine tolerances listed in feet against metric component specs.
Convert distance measurements for 3D printing or CNC milling setups.
Quickly look up common foot increments in the reference table.

Frequently Asked Questions

Related tools

Foot To Centimeter Foot To Meter Meter To Millimeter

Last updated: 2026-05-23 · Reviewed by Nham Vu