Spike's Calculators

Time from a Distance in Kilometres and Speed in Knots

Calculate the time it takes to travel a certain distance in kilometres based on a speed in knots. A knot is a unit of speed equal to one nautical mile per hour. The symbol used for a knot is kn or kt.

Time from Speed and Distance

Distance in Kilometres km
Speed in Knots kn


Distance in Nautical Miles nmi
Distance in Miles mi
Speed in Metres per Second m/sec
Speed in Feet per Second ft/sec
Time in Seconds sec
Time in Minutes min
Time in Decimal Hours hr
Time hour min sec


  1. enter the distance in kilometres
  2. the speed in knots


  1. the distance in kilometres converted to nautical miles
  2. The distance in kilometres converted to miles
  3. the knots converted to metres per second
  4. the knots converted to feet per second
  5. the time in seconds
  6. the time in minutes
  7. the time in decimal hours
  8. the time in an hour, minute, and second format

time = distance ÷ speed
one kilometre (km) = 0.621371192237334 miles (mi)
one kilometre (km) = 0.539956803455724 nautical mile (nmi)
one knot = 1 nautical mile (nmi)
one knot (kn) = 0.514444444444444 metres per second (m/sec)
one knot (kn) = 1.68780985710119 feet per second (ft/sec)
Example Calculation
How long will it take to travel 400 kilometres at a speed of 45 knots?
First, convert the kilometres to nautical miles;
400 * 0.539956803455724 = 215.9827
Four hundred kilometres equal 215.9827 nautical miles.

Divide the distance of 215.9827 nautical miles by the speed of 45 knots to get the time in hours;
215.9827 ÷ 45 = 4.799616
It will take 4.799616 hours to travel the 400 kilometres at a speed of 45 knots.
4 hr - 47 min - 59sec

If you have any questions or comments please Contact Us
Privacy Policy
© 1998, VmNet.