Distance divided by time.
Mile per Seconds to Knots Converter — mi/s to kn
Convert Mile per Seconds (mi/s) to Knots (kn) using the exact conversion factor (1 mile per seconds = 3,128.314471 knots). See the formula, worked examples, conversion table, history, and common uses.
Mile per Seconds to Knots converter
Converter
Speed Converter
Convert road, aviation, marine, lab, and scientific speed units.
Context values
Some unit families need one extra value for a physically accurate result.
A knot is one nautical mile per hour.
Result = input x 1609.344 / 0.5144444444.
Speed uses meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Mile per Seconds to Knots
Mile per Seconds and Knots both describe speed, and the conversion matters whenever a maritime or aviation speed (knots) needs to be compared against a road speed (mph). Specifically: Distance divided by time, and a knot is one nautical mile per hour.
Formula
knots = mile per seconds × 3128.31447084
This factor comes from each unit's defined relationship to the category's base unit: 1 mile per seconds equals 1609.344 base units, and 1 knots equals 0.514444444444 base units, so dividing one by the other gives the direct mile per seconds-to-knots factor of 3128.31447084.
Simple example
1 mi/s × 3128.314471 = 3,128.314471 kn
1 mile per seconds = 3,128.314471 knots.
Real-world example
10 mi/s × 3128.314471 = 31,283.14471 kn
10 mile per seconds = 31,283.14471 knots.
Conversion table
| Mile per Seconds (mi/s) | Knots (kn) |
|---|---|
| 1 mi/s | 3,128.314471 kn |
| 5 mi/s | 15,641.57235 kn |
| 10 mi/s | 31,283.14471 kn |
| 25 mi/s | 78,207.86177 kn |
| 50 mi/s | 156,415.7235 kn |
| 100 mi/s | 312,831.4471 kn |
Reverse conversion: Knots to Mile per Seconds
1 kn × 0.0003196609578 = 0.000319661 mi/s
1 knots = 0.000319661 mile per seconds.
mile per seconds = knots × 0.000319660957784
For a page dedicated to this direction, see Knots to Mile per Seconds.
Understanding the Mile per Seconds (mi/s)
Distance divided by time.
Understanding the Knots
Knots (kn) measures speed. A knot is one nautical mile per hour; since the nautical mile is exactly 1,852 meters, a knot is exactly 1,852/3,600 m/s. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
Where it's used: Used internationally in maritime navigation and aviation
Uses of the Knots today
- Ship and boat speed in marine navigation
- Aircraft airspeed and wind speed reporting in aviation
- Marine weather forecasts (wind speed)
History of the Knots
The knot gets its name from an old nautical method of measuring speed: sailors trailed a 'log line' with evenly spaced knots behind a ship and counted how many knots paid out over a fixed time, giving a direct speed reading in 'knots.'
The nautical mile it's based on was itself standardized internationally in 1929 (the International Nautical Mile, 1,852 m exactly), tying the knot to a precise value still used in shipping and aviation today.
Historical origin. Knots was not the invention of a single named person; it developed through the process described above.
Knots — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the knot among accepted non-SI speed units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many knots are in 1 mile per seconds?
1 mile per seconds equals 3,128.314471 knots, using the exact defined conversion factor rather than an estimate.
How do I convert mile per seconds to knots?
Multiply the mile per seconds value by 3128.314471. The converter above does this instantly to whatever precision you set.
How do I convert knots back to mile per seconds?
Use the reverse factor: 1 knots equals 0.000319661 mile per seconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a mile per seconds?
Mile per Seconds (mi/s) is a unit of speed.
What is a knots?
Knots (kn) measures speed. A knot is one nautical mile per hour; since the nautical mile is exactly 1,852 meters, a knot is exactly 1,852/3,600 m/s. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
Is the mile per seconds to knots conversion exact?
Yes. A knot is one nautical mile per hour; since the nautical mile is exactly 1,852 meters, a knot is exactly 1,852/3,600 m/s. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.