Convert Foot per second to Millimetre per second
1 foot per second = 304.8 millimetre per second (mm/s). For example, 10 foot per second = 3,048 millimetre per second and 100 foot per second = 30,480 millimetre per second. Type any value below to convert foot per second to millimetre per second both ways — it runs entirely in your browser.
Quick answer: Foot per second to Millimetre per second
1 Foot per second = 304.8Millimetre per second (ft/s → mm/s). To convert foot per second to millimetre per second, multiply by 304.8. To convert millimetre per second to foot per second, multiply by 0.00328084. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common foot per second-to-millimetre per second questions.
How to convert Foot per second to Millimetre per second
To convert foot per second to millimetre per second, multiply the number of foot per second by the conversion factor 304.8, because 1 ft/s = 304.8mm/s. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 mm/s = 0.00328084ft/s, so you divide by 304.8 (or multiply by 0.00328084) to turn millimetre per second back into foot per second.
mm/s = ft/s × 304.8 ·
ft/s = mm/s × 0.00328084
- Write down the value you want to convert, in foot per second.
- Multiply it by 304.8.
- The result is the same area/length/quantity expressed in millimetre per second.
Foot per second to Millimetre per second — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5foot per second is 1,524millimetre per second because 5 ft/s × 304.8 = 1,524 mm/s.
| Foot per second | Calculation | Millimetre per second |
|---|---|---|
| 1ft/s | 1 ft/s × 304.8 = 304.8 mm/s | 304.8mm/s |
| 2ft/s | 2 ft/s × 304.8 = 609.6 mm/s | 609.6mm/s |
| 3ft/s | 3 ft/s × 304.8 = 914.4 mm/s | 914.4mm/s |
| 5ft/s | 5 ft/s × 304.8 = 1,524 mm/s | 1,524mm/s |
| 7ft/s | 7 ft/s × 304.8 = 2,133.6 mm/s | 2,133.6mm/s |
| 10ft/s | 10 ft/s × 304.8 = 3,048 mm/s | 3,048mm/s |
| 12ft/s | 12 ft/s × 304.8 = 3,657.6 mm/s | 3,657.6mm/s |
| 15ft/s | 15 ft/s × 304.8 = 4,572 mm/s | 4,572mm/s |
| 20ft/s | 20 ft/s × 304.8 = 6,096 mm/s | 6,096mm/s |
| 25ft/s | 25 ft/s × 304.8 = 7,620 mm/s | 7,620mm/s |
| 50ft/s | 50 ft/s × 304.8 = 15,240 mm/s | 15,240mm/s |
| 100ft/s | 100 ft/s × 304.8 = 30,480 mm/s | 30,480mm/s |
Common Foot per second to Millimetre per second conversions
These are the foot per second-to-millimetre per second values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 foot per second = 304.8 millimetre per second
- 2 foot per second = 609.6 millimetre per second
- 2.5 foot per second = 762 millimetre per second
- 3 foot per second = 914.4 millimetre per second
- 4 foot per second = 1,219.2 millimetre per second
- 5 foot per second = 1,524 millimetre per second
- 6 foot per second = 1,828.8 millimetre per second
- 7 foot per second = 2,133.6 millimetre per second
- 8 foot per second = 2,438.4 millimetre per second
- 9 foot per second = 2,743.2 millimetre per second
- 10 foot per second = 3,048 millimetre per second
- 12 foot per second = 3,657.6 millimetre per second
- 15 foot per second = 4,572 millimetre per second
- 20 foot per second = 6,096 millimetre per second
- 25 foot per second = 7,620 millimetre per second
- 30 foot per second = 9,144 millimetre per second
- 50 foot per second = 15,240 millimetre per second
- 75 foot per second = 22,860 millimetre per second
- 100 foot per second = 30,480 millimetre per second
- 200 foot per second = 60,960 millimetre per second
- 500 foot per second = 152,400 millimetre per second
- 1000 foot per second = 304,800 millimetre per second
Foot per second to Millimetre per second conversion chart (both directions)
The chart below converts foot per second to millimetre per second and millimetre per second to foot per second side by side, so it works whichever way you need. 1 foot per second = 304.8millimetre per second, and 1 millimetre per second = 0.00328084foot per second.
| Foot per second → Millimetre per second | Millimetre per second → Foot per second |
|---|---|
| 0.25ft/s = 76.2mm/s | 0.25mm/s = 0.00082021ft/s |
| 0.5ft/s = 152.4mm/s | 0.5mm/s = 0.00164042ft/s |
| 1ft/s = 304.8mm/s | 1mm/s = 0.00328084ft/s |
| 2ft/s = 609.6mm/s | 2mm/s = 0.00656168ft/s |
| 3ft/s = 914.4mm/s | 3mm/s = 0.00984252ft/s |
| 4ft/s = 1,219.2mm/s | 4mm/s = 0.01312336ft/s |
| 5ft/s = 1,524mm/s | 5mm/s = 0.0164042ft/s |
| 6ft/s = 1,828.8mm/s | 6mm/s = 0.01968504ft/s |
| 7ft/s = 2,133.6mm/s | 7mm/s = 0.02296588ft/s |
| 8ft/s = 2,438.4mm/s | 8mm/s = 0.02624672ft/s |
| 9ft/s = 2,743.2mm/s | 9mm/s = 0.02952756ft/s |
| 10ft/s = 3,048mm/s | 10mm/s = 0.0328084ft/s |
| 12ft/s = 3,657.6mm/s | 12mm/s = 0.03937008ft/s |
| 15ft/s = 4,572mm/s | 15mm/s = 0.0492126ft/s |
| 20ft/s = 6,096mm/s | 20mm/s = 0.0656168ft/s |
| 25ft/s = 7,620mm/s | 25mm/s = 0.082021ft/s |
| 30ft/s = 9,144mm/s | 30mm/s = 0.0984252ft/s |
| 40ft/s = 12,192mm/s | 40mm/s = 0.1312336ft/s |
| 50ft/s = 15,240mm/s | 50mm/s = 0.164042ft/s |
| 75ft/s = 22,860mm/s | 75mm/s = 0.246063ft/s |
| 100ft/s = 30,480mm/s | 100mm/s = 0.328084ft/s |
| 150ft/s = 45,720mm/s | 150mm/s = 0.492126ft/s |
| 200ft/s = 60,960mm/s | 200mm/s = 0.656168ft/s |
| 250ft/s = 76,200mm/s | 250mm/s = 0.82021ft/s |
| 500ft/s = 152,400mm/s | 500mm/s = 1.64042ft/s |
| 1000ft/s = 304,800mm/s | 1000mm/s = 3.28084ft/s |
Foot per second vs Millimetre per second: which is bigger?
A foot per second is the larger unit: one foot per second equals 304.8 millimetre per seconds. Put another way, you need 304.8 millimetre per seconds to make a single foot per second.
What is a Foot per second? History, origin and usage
The foot per second measures speed in imperial feet covered each second and is the speed companion to the foot-pound and other US customary units. It is a natural choice in systems where distances are already expressed in feet.
Feet per second is widely used in US ballistics (the muzzle velocity of bullets and arrows), in aerodynamics, and in some engineering and physics work. It also appears in fluid-flow and conveyor-speed specifications in the United States.
One foot per second is exactly 0.3048 metres per second, since a foot is defined as exactly 0.3048 metres. Rifle bullets typically leave the barrel at well over a thousand feet per second.
What is a Millimetre per second? History, origin and usage
The millimetre per second is a fine-resolution metric speed unit, useful where motion is too slow even for centimetres per second. It is built from the millimetre, one-thousandth of a metre.
Millimetres per second is used for very slow, precise motion: machine-tool feed rates, the crawl of fluids and gels, vibration-velocity limits in condition monitoring, and creep in materials and geology. It keeps slow speeds readable as whole numbers.
One millimetre per second equals exactly 0.001 metres per second. Industrial vibration standards often set machine-health alarm thresholds in millimetres per second of vibration velocity.
Convert 1 Foot per second to other units
It can help to see a foot per second next to the other units it is commonly compared with. One foot per second (ft/s) is equal to:
| 1 Foot per second equals | Unit |
|---|---|
| 0.3048m/s | Metre per second |
| 1.09728km/h | Kilometre per hour |
| 0.6818182mph | Mile per hour |
| 30.48cm/s | Centimetre per second |
| 304.8mm/s | Millimetre per second |
| 0.5924838kn | Knot |
Convert 1 Millimetre per second to other units
One millimetre per second (mm/s) is equal to:
| 1 Millimetre per second equals | Unit |
|---|---|
| 0.001m/s | Metre per second |
| 0.0036km/h | Kilometre per hour |
| 0.002236936mph | Mile per hour |
| 0.00328084ft/s | Foot per second |
| 0.1cm/s | Centimetre per second |
| 0.001943844kn | Knot |
Tips for converting Foot per second to Millimetre per second
- To go from foot per second to millimetre per second, multiply by 304.8; to go back, divide by 304.8 (or multiply by 0.00328084).
- For a quick mental estimate, remember that 1 foot per second ≈ 304.8 millimetre per second, so 10 foot per second ≈ 3,048 millimetre per second.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type — change either side to convert in that direction.
How to use this Foot per second to Millimetre per second converter
Type a number into the Foot per second field and the equivalent in Millimetre per second appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Millimetre per second field to convert the other way (millimetre per second to foot per second). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 ft/s = 304.8mm/s), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for foot per second-to-millimetre per second conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
All speed factors are exact: 1 m/s = 3.6 km/h, 1 mph = 1.609344 km/h, 1 knot = 1.852 km/h, 1 ft/s = 0.3048 m/s. So the live tool and every number on this page always agree.
Frequently asked questions
- How many millimetre per second are in 1 foot per second?
- 1 foot per second = 304.8 millimetre per second (mm/s). To convert any number of foot per second to millimetre per second, multiply by 304.8.
- How do I convert foot per second to millimetre per second?
- Multiply the number of foot per second by 304.8. For example, 10 foot per second = 10 × 304.8 = 3,048 millimetre per second, and 25 foot per second = 7,620 millimetre per second.
- How many foot per second are in 1 millimetre per second?
- 1 millimetre per second = 0.00328084 foot per second. So to convert millimetre per second back to foot per second, multiply by 0.00328084.
- What is the formula to convert foot per second to millimetre per second?
- millimetre per second = foot per second × 304.8. The reverse formula is foot per second = millimetre per second × 0.00328084.
- How much is 100 foot per second in millimetre per second?
- 100 foot per second = 30,480 millimetre per second. (And 1000 foot per second = 304,800 millimetre per second.)
- Which is bigger, a foot per second or a millimetre per second?
- A foot per second is larger: 1 foot per second = 304.8 millimetre per second.
- Is this foot per second to millimetre per second converter accurate?
- Yes — every value is computed from the exact 304.8 mm/s per ft/s factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert millimetre per second to foot per second too?
- Yes. The converter works both ways — enter a value in either field. 1 millimetre per second = 0.00328084 foot per second.