Miles per hour to Knots Converter

1 mph equals 0.86897624 kn, and 1 kn equals 1.1507794 mph. Enter a value in either box to convert miles per hour to knots and back. Formula: m/s = value x factor (1 mph = 0.44704 m/s exactly; 1 knot = 1852/3600 m/s; 1 km/h = 1/3.6 m/s).

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1 mph = 0.86897624 kn

Approximate: Mach depends on air temperature and altitude. This tool uses the International Standard Atmosphere value at sea level (340.294 m/s), so treat Mach results as approximate.

Results shown are estimates for informational purposes only. Nothing on CalcFlow is financial, tax, legal, or medical advice. Always consult a qualified professional before making important decisions.

Miles per hour to Knots Conversion Table

Miles per hourKnots
1 mph0.86897624 kn
5 mph4.3448812 kn
10 mph8.6897624 kn
20 mph17.379525 kn
30 mph26.069287 kn
50 mph43.448812 kn
60 mph52.138575 kn
100 mph86.897624 kn
120 mph104.27715 kn

Knots to Miles per hour Conversion Table

KnotsMiles per hour
1 kn1.1507794 mph
5 kn5.7538972 mph
10 kn11.507794 mph
20 kn23.015589 mph
30 kn34.523383 mph
50 kn57.538972 mph
60 kn69.046767 mph
100 kn115.07794 mph
120 kn138.09353 mph

Worked example: 10 mph = 8.6897624 kn. A speed limit of 100 km/h is 100 x 0.621371 = 62.14 mph. A 20 knot wind is 20 x 1.852 = 37.04 km/h.

Need other units? Open the full Speed Converter.

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Formula

m/s = value x factor (1 mph = 0.44704 m/s exactly; 1 knot = 1852/3600 m/s; 1 km/h = 1/3.6 m/s)

Understanding Speed Conversion

Speed is distance divided by time, so speed units pair a length unit with a time unit. Road speeds are in kilometers per hour in most countries and miles per hour in the United States and UK. Ships and aircraft use knots, a nautical mile per hour. Mach compares speed with the speed of sound, which changes with temperature, so a fixed sea-level reference is used here.

Tips and Best Practices

  • 1To convert km/h to mph multiply by 0.6214; mph to km/h multiply by 1.6093.
  • 2To convert m/s to km/h multiply by 3.6.
  • 3One knot is about 1.15 mph or 1.852 km/h.

Real-World Example

A speed limit of 100 km/h is 100 x 0.621371 = 62.14 mph. A 20 knot wind is 20 x 1.852 = 37.04 km/h.

Common Mistakes to Avoid

  • Dividing by 3.6 when you should multiply (m/s to km/h multiplies, km/h to m/s divides).
  • Treating a knot as a unit of distance; it is already per hour, so "knots per hour" is wrong.
  • Using Mach 1 as a constant 1,235 km/h; it varies with altitude and temperature.

How to Use

  1. Type a number in the Miles per hour box.
  2. The Knots result appears instantly; you can also edit the Knots box to convert backwards.
  3. Use the swap button to reverse the direction and Copy result to copy the answer.

Frequently Asked Questions

Q

How many knots are in 1 mph?

1 mph equals 0.86897624 kn.
Q

How many miles per hour are in 1 kn?

1 kn equals 1.1507794 mph.
Q

What is the formula to convert miles per hour to knots?

m/s = value x factor (1 mph = 0.44704 m/s exactly; 1 knot = 1852/3600 m/s; 1 km/h = 1/3.6 m/s).
Q

How do I convert m/s to km/h?

Multiply meters per second by 3.6 to get kilometers per hour.

Sources: NIST SP 811 (mile, knot); ISO 2533 International Standard Atmosphere (speed of sound 340.294 m/s at sea level, 15 C).

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