Mowing Rate Calculator

Calculate acres per hour based on width and speed.

Result:

Time is Money: Optimizing Farm Efficiency

In agriculture, timing is everything. Whether you are planting before the rain comes, spraying for pests, or harvesting before the frost, knowing exactly how much ground you can cover in an hour is critical for logistics. Our Acre Per Hour Calculator takes the guesswork out of planning, helping farmers and equipment operators calculate their theoretical and actual field capacities.

The Formula for Field Capacity

Calculating acres per hour is a function of width, speed, and efficiency.

$$Rate (Acres/Hr) = \frac{Speed (mph) \times Width (ft) \times Efficiency (\%)}{8.25}$$

Where does 8.25 come from?
An acre is 43,560 square feet. A mile is 5,280 feet.
To convert speed and width directly into acres, we use a conversion factor.
$43,560 / 5,280 = 8.25$.
So, this "magic number" is just the mathematical bridge between linear feet/miles and square acres.

Understanding Field Efficiency

Most simple calculations forget this crucial step: You never work at 100% capacity.
Efficiency accounts for:
- Turns: Slowing down and lifting implements at the headlands.
- Overlaps: You almost always overlap your previous pass slightly to ensure no skips.
- Refills: Stopping to add seed, fertilizer, or spray.
- Maintenance: Checking nozzles or clearing a jammed plug.

Typical Efficiency Rates:
- Tillage (Plowing/Disking): 70-85% (Lots of turning)
- Planting/Seeding: 65-75% (Frequent refills)
- Spraying: 60-70% (High speed but lots of refilling)
- Harvesting (Combine): 65-80% (Depends on unloading on-the-go)

Improving Your Rate

To cover more acres per hour, you have three variables:
1. Go Faster: The most obvious choice, but limited by field roughness and the job quality. Planting too fast typically results in poor seed spacing ("skips and doubles").
2. Get Wider: Buying a 24-row planter instead of a 12-row doubles your capacity (mostly). However, wider equipment is harder to transport and turn.
3. Improve Efficiency: This is the cheapest way to "buy" capacity.
- Use GPS guidance (Auto-steer) to minimize overlap from 10% down to 1%.
- Plan field patterns to minimize turns.
- Use "pit crews" to refill seed/chem faster to keep the tractor moving.

Why Estimate?

Knowing your rate allows you to:
- Schedule labor: "It will take 12 hours to plant this field, so we need a night shift."
- Order Inputs: "We cover 20 acres an hour and apply 5 gallons per acre, so we need a 1000 gallon tank every 10 hours."
- Contract Work: If you are mowing for a neighbor, you can accurately quote how long the job will take and charge appropriately.