Acres per Hour — Width × Speed

Estimate field capacity in acres per hour from working width, miles per hour, and field efficiency, with an optional hours estimate for a known acreage.

Updated 2026-07-13

Reviewed by Daniel Dick · 2026-07-26

Calculator

Accounts for turns, overlaps, and downtime. Common starting values are 70–90%.
Enter acres to also estimate hours needed at this field capacity.

Enter your values and click Calculate.

What this calculator determines

Theoretical field capacity in acres per hour, and optional hours to cover a entered acreage.

Formula or calculation method

acres per hour = (width in feet × speed in mph × field efficiency %) ÷ 8.25

hours needed = acres ÷ acres per hour

The divisor 8.25 equals 43,560 square feet per acre ÷ 5,280 feet per mile.

Definitions of inputs

  • Implement width — Effective working width of the boom, mower, or other implement, in feet.
  • Travel speed — Ground speed in miles per hour.
  • Field efficiency — Percent of time spent effectively covering ground (turns, overlaps, refills reduce this; typical range 60–85%).
  • Acres — Optional area to translate capacity into total hours.

Worked example

Example only — not a recommendation.

A 16 ft sprayer at 3 mph with 75% field efficiency:

  • Acres/hour = (16 × 3 × 0.75) ÷ 8.25 = 36 ÷ 8.25 ≈ 4.36 acres/hour
  • For 20 acres: 20 ÷ 4.36 ≈ 4.6 hours

How to interpret the result

Use acres per hour to plan block coverage time and compare equipment setups. Lower field efficiency when turns, headlands, or refills dominate the job.

Assumptions

  • Width is the effective working width of the implement or boom.
  • Field efficiency accounts for turns, overlaps, and typical downtime.

Limitations

  • Does not account for terrain, canopy, traffic patterns, or machine limits beyond the efficiency you enter.

Version 0.1.0 · Last updated: 2026-07-13 · Reviewed: 2026-07-26

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Disclaimer

This tool performs math only. It does not replace professional judgment, local regulations, or official recommendations.