Convert 100 mph to kn

How to convert miles per hour to knots

1. Formula: knots = miles per hour × 0.86897624
2. Put in the value: 100 miles per hour.
3. Result: 86.897624 knots.

Miles per hour to knots table

Converting the other way: knots to miles per hour

miles per hour = knots × 1.150779. So 86.897624 knots is back to 100 miles per hour; one knot is 1.150779 miles per hour. See the knots to miles per hour table.

Quick estimate in your head

For a rough answer, multiply by about 0.9: 100 × 0.9 ≈ 90 kn, against the exact 86.897624 kn (3.6% out). Good enough to check that a calculated result is sensible.

Common mistakes

The usual slip is using the factor the wrong way round. A mile per hour is smaller than a knot, so the number of knots must come out smaller than the number of miles per hour. If your answer goes the other way, divide instead of multiplying.

About the units

Mile per hour (mph) and knot (kn) are both units of speed. One mile per hour equals 0.86897624 knots, and one knot equals 1.150779 miles per hour. Results on this page are rounded for display; the conversion itself uses the exact definitions.

Speed conversions come up when driving abroad, in running and cycling paces, weather and wind reports, and sailing and flying.

100 miles per hour in other units

The most readable unit for this amount is meters per second (44.704).

• 44.704 mps
• 160.9344 kph
• 86.897624 kn
• 146.666667 fps

How this answer was calculated

The result is worked out from the numbers in this page's address when the page is opened, using exact arithmetic wherever possible and rounding only for display. Nothing is copied from a printed table. If you think an answer is wrong, please tell us through the contact page and we will check it.

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