ConvBolt — Unit ConverterFeet to Millimeters Converter
Converting feet to millimeters is a multiplication by a fixed factor: 1 ft = 304.8 mm. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because one foot works out to 304.8 mm, the millimeter is the far larger unit of the two: a figure given in millimeter always carries a larger number than the same measurement in foot. A chart drawn in ft can hide that, so check which label the axis uses before you compare two readings.
DIY and home-improvement work is where this pair shows up most: you measure in feet but the hardware store or an imported product sheet quotes millimeters, so the conversion has to be right the first time.
The conversion factor used here is 304.8 mm per foot (1 significant digits as shown). Kept to seven figures it covers professional measurement; if you round it to two or three decimals for a spreadsheet, the error scales with the input — at a value of 1,000 ft a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 0.00328084 ft per mm, the exact reciprocal, so a round trip through both pages returns your original number.
Feet to Millimeters formula
Use this formula to convert any foot value to millimeters:
Worked example: 100 ft × 304.8 = 30480 mm.
Feet to Millimeters conversion table
| Feet (ft) | Millimeters (mm) |
|---|---|
| 0.5 ft | 152.4 mm |
| 1 ft | 304.8 mm |
| 2 ft | 609.6 mm |
| 5 ft | 1524 mm |
| 10 ft | 3048 mm |
| 20 ft | 6096 mm |
| 50 ft | 15240 mm |
| 100 ft | 30480 mm |
| 500 ft | 152400 mm |
| 1000 ft | 304800 mm |
How to convert feet to millimeters
Multiply the foot value by 304.8 to get the equivalent in millimeters. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.
If you need the opposite direction, use the Millimeters to Feet converter instead of dividing by hand; both pages use the same source factors. For every other ft conversion in one place, see the ft conversion hub.
Frequently asked questions
How many millimeters are in 1 foot?
1 foot = 304.8 mm.
What is 100 feet in millimeters?
100 ft = 30480 mm.
Is converting feet to millimeters the same as millimeters to feet?
No — the direction changes the multiplier. The reverse conversion (1 mm = 0.00328084 ft) is on the Millimeters to Feet page.
Related conversions
Try the ConvBolt Unit Converter for any other length unit, browse the Length conversions, or read our conversion guides.