Calculate flight time, speed, or distance using any two known values. This free aviation calculator helps pilots with flight planning, ETA estimates, navigation, and performance planning.
Enter any two values below and leave the one you want to calculate blank. Time is entered in hours and minutes.
This calculator uses nautical miles and knots, which makes it especially useful for aviation planning.
A time speed distance calculator solves one of the three core flight planning variables when the other two are known. Pilots use it to estimate flight time, determine required groundspeed, or calculate leg distance.
This is one of the most common aviation planning tools because it supports enroute planning, ETA calculations, fuel planning, and cross-country navigation.
Pilots commonly use nautical miles for distance and knots for speed. Time is usually tracked in hours and minutes.
For flight planning, this calculator is usually most useful with groundspeed. If you use true airspeed instead, wind effects are not included.
This page is designed for hours and minutes because that format is usually more practical for pilots.
Time-speed-distance calculations help pilots estimate arrival times, plan fuel use, and make better navigation decisions.