ConvBolt — Unit ConverterMiles per hour to Knots Converter
Converting miles per hour to knots is a multiplication by a fixed factor: 1 mph = 0.8689762 kn. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because one mile per hour works out to 0.8689762 kn, the knot is the smaller unit of the two: a figure given in knot always carries a smaller number than the same measurement in mile per hour. A chart drawn in mph can hide that, so check which label the axis uses before you compare two readings.
Driving and sport are the everyday sources of this pair: a dashboard reading in miles per hour against a speed limit posted in knots, or a training plan written in one while a device reports the other.
The conversion factor used here is 0.8689762 kn per mile per hour (7 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 mph a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 1.150779 mph per kn, the exact reciprocal, so a round trip through both pages returns your original number.
Miles per hour to Knots formula
Use this formula to convert any mile per hour value to knots:
Worked example: 100 mph × 0.8689762 = 86.89762 kn.
Miles per hour to Knots conversion table
| Miles per hour (mph) | Knots (kn) |
|---|---|
| 0.5 mph | 0.4344881 kn |
| 1 mph | 0.8689762 kn |
| 2 mph | 1.737952 kn |
| 5 mph | 4.344881 kn |
| 10 mph | 8.689762 kn |
| 20 mph | 17.37952 kn |
| 50 mph | 43.44881 kn |
| 100 mph | 86.89762 kn |
| 500 mph | 434.4881 kn |
| 1000 mph | 868.9762 kn |
How to convert miles per hour to knots
Multiply the mile per hour value by 0.8689762 to get the equivalent in knots. 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 Knots to Miles per hour converter instead of dividing by hand; both pages use the same source factors. For every other mph conversion in one place, see the mph conversion hub.
Frequently asked questions
How many knots are in 1 mile per hour?
1 mile per hour = 0.8689762 kn.
What is 100 miles per hour in knots?
100 mph = 86.89762 kn.
Is converting miles per hour to knots the same as knots to miles per hour?
No — the direction changes the multiplier. The reverse conversion (1 kn = 1.150779 mph) is on the Knots to Miles per hour page.
Related conversions
Try the ConvBolt Unit Converter for any other speed unit, browse the Speed conversions, or read our conversion guides.