Tractor PTO Calculator
Tractor PTO
Estimate PTO horsepower needs for implements.
Formula
Engine HP = (Implement HP / PTO Efficiency) / Altitude Factor x (1 + Margin)
Frequently Asked Questions
What is PTO efficiency?
PTO efficiency is the percentage of engine power that reaches the PTO shaft, typically 83 to 87%.
How does altitude affect tractor power?
Engines lose about 3.5 percent of power for every 1000 feet of altitude.