All tools
Speed / Time / Distance
The classic navigation triangle — solve for any one value given the other two.
What do you want to calculate?
Tip: Use decimal hours for time — e.g. 2.5 hours = 2h 30m. For sub-hour legs, 0.25 = 15 min.
Computed distance
48.0nm
All Values
- Speed
- 24.0 kts
- Time
- 2.00 hrs
- Distance
- 48.0 nm
- ETA (duration)
- 2h 0m
The 60 D = S × T formula
The fundamental navigation formula is Distance = Speed × Time. When working in nautical units, speed is in knots (nautical miles per hour), time in hours, and distance in nautical miles. The variants:
- Speed = Distance ÷ Time (knots)
- Time = Distance ÷ Speed (hours)
- Distance = Speed × Time (nm)
For minutes instead of hours, multiply hours by 60. For seconds, multiply by 3600. This calculator handles the conversion automatically — enter time in decimal hours (e.g., 2.5 hours = 2h 30m).