Landing distance calculator
Landing distance corrections work the same way as take-off, but a tailwind hurts far more because approach speeds are lower.
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Landing roll with safety factor
374m
- Landing distance from 50 feet
- 711
- Unfactored roll
- 262
- Landing roll in feet
- 1227
- Combined correction factor
- 0.872
- Wind factor
- 0.840
- Surface factor
- 1.000
Show the working
- Book landing roll = 300
- Density altitude = 3000
- Weight as a share of maximum = 95
- Headwind = 5
- Approach speed = 60
- Runway slope = 0
- Surface = 1
- Safety factor = 1.43
- altitude_factor = 1 + 0.05 * 3000/1000 = 1.15
- weight_factor = (95/100)^2 = 0.9025
- Wind factor = 60 > 0 ? (1 - 5/60)^2 : 1 = 0.840 278
- slope_factor = 1 - 0.05 * 0 = 1
- Unfactored roll = 300 * 1.15 * 0.9025 * 0.840 278 * 1 * 1 = 261.631
- Landing roll with safety factor = 261.631 * 1.43 = 374.132
- Landing distance from 50 feet = 374.132 * 1.9 = 710.851
- Landing roll in feet = 374.132 * 3.280839895013123 = 1227.47
- Combined correction factor = 300 > 0 ? 261.631/300 : 0 = 0.872 103
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- landing roll = book roll x altitude x weight^2 x wind^2 x slope x surface
Wet grass can nearly double the roll, and a downhill slope makes it worse still.
Landing safety factors of 1.43 are the common private-flying convention.
This is a planning and study tool. Use certified charts, an approved flight manual and official publications for anything operational.