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Speed Distance Time Calculator
Solve for speed, distance or time in one place, with a unit for every mode of transport.
speed = distance ÷ time
Also called sdt calculator · distance speed time
Auto & Travel · 9 calculators
Navigation Calculators
Bearing between coordinates, relative bearing, wind correction and heading, dead reckoning, course correction and fuel range.
Navigation
Compass Bearing Calculator
Convert between true, magnetic and compass bearings using variation and deviation.
true = compass + deviation + variation
Also called magnetic bearing converter · true to magnetic
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Relative Bearing Calculator
Convert between relative and true bearings from your heading, for collision avoidance.
true bearing = heading + relative bearing
Also called bearing from heading · relative to true bearing
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Wind Correction Angle Calculator
Wind correction angle, heading and groundspeed for a desired track — the classic wind triangle.
WCA = arcsin(crosswind ÷ TAS)
Also called wca calculator · wind triangle calculator
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Travel Time Calculator
Journey time from distance and average speed, including stops — with the arrival time.
Time = distance ÷ speed + breaks
Also called time calculator distance speed · how long will it take to drive
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Knots Converter
Convert knots (kn) to kilometers per hour (km/h) instantly. Includes the exact conversion factor, formula and a quick reference table.
km/h = kn × 1.852
Also called kn to km/h · Knots to Kilometers per hour
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Dead Reckoning Calculator
Estimated position after running a course and speed for a given time, with distance made good.
position = course vector + current vector
Also called dr position calculator · estimated position
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Course Correction Calculator
Heading change needed to get back on track after drifting off, with the distance to regain it.
correction = arctan(off-track ÷ run) + ar…
Also called off course correction · track error calculator
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Fuel Range Calculator
How far you can travel on the fuel aboard, with a safe reserve held back.
range = usable fuel ÷ burn rate × speed
Also called range on fuel · boat fuel range
Key navigation formulas
| Speed Distance Time | speed = distance ÷ time · distance = speed × time · time = distance ÷ speed |
|---|---|
| Compass Bearing | true = compass + deviation + variation |
| Relative Bearing | true bearing = heading + relative bearing |
| Wind Correction Angle | WCA = arcsin(crosswind ÷ TAS) · GS = TAS·cos(WCA) − headwind |
| Travel Time | Time = distance ÷ speed + breaks |
| Knots Converter | km/h = kn × 1.852 |
| Dead Reckoning | position = course vector + current vector |
| Course Correction | correction = arctan(off-track ÷ run) + arctan(off-track ÷ remaining) |
| Fuel Range | range = usable fuel ÷ burn rate × speed |
Navigation questions
How many kilometers per hour are in one knot?
1 kn equals 1.852 km/h.