Time-Speed-Distance Calculator
Solve for any one of time, groundspeed, or distance when you know the other two — the most fundamental calculation in flight planning. Time results are always shown as hours and minutes. Supports nautical miles, statute miles, kilometers, knots, MPH, and KPH.
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Why This Matters to Pilots
Time-speed-distance is the foundation of all flight planning. Every leg of a cross-country — estimated time enroute, fuel required, and arrival time — begins with a TSD calculation.
TSD calculations use groundspeed, not airspeed. Airspeed is your speed through the air; groundspeed is your speed over the ground after wind is applied. A headwind lowers groundspeed and increases time enroute, while a tailwind does the opposite. Use the Wind Correction Angle Calculator to find groundspeed from your true airspeed and the wind.
The FAA Private Pilot knowledge exam includes time-speed-distance problems, and every checkride cross-country requires them.
The E6B flight computer solves TSD problems mechanically with its rotating wheel; this calculator replicates that same function digitally.
Limitations
This calculator uses constant speed and does not account for wind changes, altitude changes, or course deviations. For precise flight planning, use actual groundspeed from your GPS or flight plan.
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Frequently Asked Questions
This calculator is for educational and planning purposes only. Always refer to your aircraft's POH/AFM, current NOTAMs, and official weather briefings. No calculator is a substitute for pilot-in-command judgment or CFI guidance.
Last reviewed: July 2026
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