Mile/Hour to Mile/Second Converter
Convert Mile/Hour (mph) to Mile/Second (mi/s) instantly. 1 mph = 0.000278 mi/s.
Speed Converter
18 units available
1 mph = 0.000278 mi/s
Formula:
mi/s = mph × 0.0002777778With your value: 1 mph = 0.00027778 mi/s
How big is that?
Everyday references on a logarithmic scale, all expressed in mile/hour so you can sanity-check the result.
Other Mile/Hour to Mile/Second conversions
Mile/Hour to Mile/Second Conversion Table
| Mile/Hour (mph) | Mile/Second (mi/s) |
|---|---|
| 0.5 | 0.000139 |
| 1 | 0.000278 |
| 2 | 0.000556 |
| 5 | 0.001389 |
| 10 | 0.002778 |
| 15 | 0.004167 |
| 20 | 0.005556 |
| 25 | 0.006944 |
| 50 | 0.013889 |
| 100 | 0.027778 |
| 250 | 0.069444 |
| 500 | 0.138889 |
| 1000 | 0.277778 |
Mile/Second to Mile/Hour Conversion Table
| Mile/Second (mi/s) | Mile/Hour (mph) |
|---|---|
| 0.5 | 1,800 |
| 1 | 3,600 |
| 2 | 7,200 |
| 5 | 18,000 |
| 10 | 36,000 |
| 15 | 54,000 |
| 20 | 72,000 |
| 25 | 90,000 |
| 50 | 180,000 |
| 100 | 360,000 |
| 250 | 900,000 |
| 500 | 1,800,000 |
| 1000 | 3,600,000 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Mile/Hour (mph)
Speed
Derived quantity: a defined length divided by a defined time interval.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Mile/Second (mi/s)
Speed
Derived quantity: a defined length divided by a defined time interval.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Mile/Hour to Mile/Second
To convert from Mile/Hour (mph) to Mile/Second (mi/s), multiply the value by 0.0002777778.
Formula: mi/s = mph × 0.0002777778
Reverse: mph = mi/s × 3,600
Step-by-Step Example
- Start with your value in Mile/Hour. For example: 5 mph
- Multiply by the conversion factor: 5 x 0.0002777778
- The result is: 0.001389 mi/s
About Mile/Hour
Miles per hour is the standard unit of speed in the US and UK for vehicles and weather reporting.
Common uses: speed limits (US/UK), vehicle speed, baseball.
About Mile/Second
The mile/second (mi/s) is a unit of speed and velocity. One mile/second equals 1609.344 metre per seconds. UnitConvertLab converts it against every other speed unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: speed calculations, engineering and science, education.
Frequently Asked Questions
How many Mile/Second are in 1 Mile/Hour?
There are exactly 0.0002777778 Mile/Second in 1 Mile/Hour. This means the conversion factor from Mile/Hour to Mile/Second is 0.0002777778.
What is the formula to convert Mile/Hour to Mile/Second?
The formula to convert Mile/Hour to Mile/Second is: mi/s = mph × 0.0002777778. For example, to convert 10 Mile/Hour to Mile/Second, you would multiply 10 by 0.0002777778.
What is a Mile/Hour?
Miles per hour is the standard unit of speed in the US and UK for vehicles and weather reporting.
What is a Mile/Second?
The mile/second (mi/s) is a unit of speed and velocity. One mile/second equals 1609.344 metre per seconds. UnitConvertLab converts it against every other speed unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Mile/Hour?
The Mile/Hour is commonly used in speed limits (US/UK), vehicle speed, baseball.
Related Speed Conversions
Cite this page
UnitConvertLab. (2026). Mile/Hour to Mile/Second converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/mph-to-mips