Tractor PTO Mower Acres Per Hour Calculator
Calculate acres per hour for a tractor PTO mower from cutting width and ground speed, with field efficiency and time for the job.
How This Calculation Works
Acres per hour equals cutting width in feet times speed in mph times 5,280, divided by 43,560, then multiplied by field efficiency. A 10-foot mower at 5 mph covers about 6 acres per hour at 100 percent efficiency, or about 5 acres at 85 percent. Field efficiency accounts for turns, overlaps and downtime.
Field Calibration & Rate Reference Chart
| Area | Square feet | Acres | Square field side |
|---|---|---|---|
| 1,000 sq ft | 1,000 | 0.023 | 32 ft |
| 5,000 sq ft | 5,000 | 0.115 | 71 ft |
| 10,000 sq ft | 10,000 | 0.230 | 100 ft |
| 0.25 acre | 10,890 | 0.250 | 104 ft |
| 0.5 acre | 21,780 | 0.500 | 148 ft |
| 1 acre | 43,560 | 1.000 | 209 ft |
| 5 acres | 217,800 | 5.000 | 467 ft |
| 10 acres | 435,600 | 10.000 | 660 ft |
| 40 acres | 1,742,400 | 40.000 | 1,320 ft |
| 100 acres | 4,356,000 | 100.000 | 2,087 ft |
Common Questions
How many acres per hour can a tractor mower cut?
Multiply cutting width in feet by speed in mph and by 5,280, then divide by 43,560. A 10-foot mower at 5 mph covers about 6 acres per hour before efficiency losses. Apply a field efficiency of 80 to 90 percent.
What is field efficiency?
Field efficiency is the fraction of theoretical capacity actually achieved, reduced by turns, overlaps, filling and downtime. It ranges from about 70 percent on small fields to 90 percent on large, rectangular ones. Use a realistic figure for planning.
How fast should I mow a hay field?
Most mowing runs 4 to 8 mph, slower in heavy or uneven stands. Too fast leaves an uneven cut and can damage the mower. Match speed to the crop and terrain.
How do I estimate time to mow a field?
Divide the field acres by the acres per hour. A 30-acre field at 5 acres per hour takes about 6 hours. Add time for turns, refueling and any breakdowns.