A sprayer with a 60 ft boom at 10 mph and 80 percent efficiency covers 58.18 acres per hour before refill time, so the answer to how many acres can a sprayer spray per hour depends on boom width, speed, efficiency and refill stops. Refill time can cut that rate to 50.76 acres per hour.
That short answer covers two rates: the spraying rate while the boom is moving, and the effective rate across a whole job, with refill stops counted.
Table of Contents
The Formula Behind Every Sprayer Rate
Acres per hour equals width in ft times speed in mph times efficiency, divided by 8.25. Efficiency is written as a decimal, so 80 percent becomes 0.80. The constant 8.25 comes from 43560 divided by 5280, because an acre is 43560 square feet and a mile is 5280 feet. Use the boom width actually in use, not the width printed on the frame, and use average working speed, not top speed.
Test the formula with the opening example. A 60 ft boom at 10 mph and 80 percent efficiency gives 60 times 10 equals 600, times 0.80 equals 480, divided by 8.25 equals 58.18 acres per hour. Change one input and the answer changes in direct proportion.
Efficiency bands help you choose a fair value. The verified bands are 55 to 65 percent for small or irregular fields, 70 to 75 percent for average fields, 80 to 85 percent for large rectangular fields, and 85 to 90 percent for ideal fields with GPS guidance.
How Many Acres Per Hour By Boom Width
The table below holds speed at 10 mph and efficiency at 80 percent, so only boom width changes. The last column is field work time for 100 acres before refill time.
| Boom width | Acres per hour | Time for 100 acres, field work only |
|---|---|---|
| 20 ft | 19.39 | 5.16 hours |
| 30 ft | 29.09 | 3.44 hours |
| 40 ft | 38.79 | 2.58 hours |
| 60 ft | 58.18 | 1.72 hours |
| 90 ft | 87.27 | 1.15 hours |
| 120 ft | 116.36 | 0.86 hours |
Check one row by hand. A 40 ft boom at 10 mph and 80 percent efficiency gives 40 times 10 equals 400, times 0.80 equals 320, divided by 8.25 equals 38.79 acres per hour. Time for 100 acres is 100 divided by 38.79, which is 2.58 hours.
Use the table as a starting point, not as a rate for your machine. At 8 mph instead of 10 mph, the 60 ft row falls from 58.18 to 46.55 acres per hour. At 70 percent efficiency instead of 80 percent, it falls from 58.18 to 50.91 acres per hour.
How Many Acres Can a Sprayer Spray Per Hour
Working speed is the speed you can hold while the boom is down and coverage is even. Top speed on a road is not working speed. Efficiency is the share of time spent covering new ground. Overlap also cuts the effective width. If you overlap each pass by 2 ft, a 60 ft boom only works 58 ft of new ground. At 10 mph and 80 percent efficiency, that cuts the rate from 58.18 to 56.24 acres per hour: 58 times 10 equals 580, times 0.80 equals 464, divided by 8.25 equals 56.24.
How Refill Time Caps The Effective Rate
The refill limited rate uses tank size, application rate and refill time. First, acres per tank equals tank size divided by application rate. Second, spraying time per tank equals acres per tank divided by the spraying rate, turned into minutes. Third, total time per tank equals spraying time plus refill time. Fourth, the effective rate equals acres per tank divided by total hours per tank.
The full refill method is in the live sprayer refill guide, and this blog does not repeat that method in full. The two worked examples below use clearly labelled example inputs only.
Worked Example 1: A Large Sprayer With A 1000 Gallon Tank
Example inputs, labelled as examples only: tank size 1000 gallons, application rate 10 gallons per acre, refill time 15 minutes, boom width 60 ft, speed 10 mph, efficiency 80 percent.
Acres per tank equals 1000 divided by 10, which is 100 acres. Spraying time per tank equals 100 divided by 58.18, which is 1.72 hours, or 103.13 minutes. Total time per tank equals 103.13 minutes plus 15 minutes, which is 118.13 minutes, or 1.97 hours. The effective rate equals 100 acres divided by 1.97 hours, which is 50.76 acres per hour.
That is a drop of 7.42 acres per hour from the spraying rate, even though the refill is only 15 minutes. Time for 100 acres at the effective rate is 1.97 hours. A 200 acre field would need two tanks, or 3.94 hours, before travel is counted.
Worked Example 2: A Small Sprayer With A 300 Gallon Tank
Example inputs, labelled as examples only: tank size 300 gallons, application rate 15 gallons per acre, refill time 10 minutes, boom width 30 ft, speed 8 mph, efficiency 75 percent.
Acres per tank equals 300 divided by 15, which is 20 acres. The spraying rate is 21.82 acres per hour: 30 times 8 equals 240, times 0.75 equals 180, divided by 8.25 equals 21.82. Spraying time per tank equals 20 divided by 21.82, which is 0.92 hours, or 55.00 minutes. Total time per tank equals 55.00 minutes plus 10 minutes, which is 65.00 minutes, or 1.08 hours. The effective rate equals 20 acres divided by 1.08 hours, which is 18.52 acres per hour.
That is a drop of 3.30 acres per hour from the spraying rate. Time for 100 acres at the effective rate is 100 divided by 18.52, which is 5.40 hours, using five tanks of 20 acres each.
The Same Maths In Metric Units
Hectares per hour equals width in m times speed in km/h times efficiency, divided by 10. Take an 18 m boom at 12 km/h and 80 percent efficiency. The rate is 17.28 hectares per hour: 18 times 12 equals 216, times 0.80 equals 172.8, divided by 10 equals 17.28. Use one system for the whole calculation. Do not mix a width in feet with a speed in km/h, or a width in metres with a speed in mph.
How To Use The Calculator For Your Sprayer
Open the free acres per hour calculator on the homepage and enter the boom width actually in use, the average working speed, and the efficiency band for your field. Read the spraying rate first, then work out the refill limited rate with your own tank size, application rate and refill time. If the effective rate is much lower than the spraying rate, change the logistics first, not the speed.
Common Mistakes And Limitations
The most common mistake is planning on the spraying rate and forgetting refill time. The day includes stops, so a plan built on the spraying rate alone will finish late. Use the effective rate for the day. The second mistake is entering top speed instead of average working speed, and the third is using machine width instead of working width. A 60 ft boom with 2 ft of overlap is a 58 ft working width, and the rate falls from 58.18 to 56.24 acres per hour at 10 mph and 80 percent efficiency.
The fourth mistake is assuming 100 percent efficiency. No real machine works at 100 percent, because turns, overlap, refill stops and small stops always take time. Use the verified bands in this guide. The fifth mistake is treating an example input as a standard spec. The tank sizes, application rates and refill times here are labelled example inputs only. Use your own tank size, application rate and refill time.
This guide assumes a constant speed and width across the field, and one efficiency value for the whole job. It does not account for travel, breaks, wind delays, or a change in ground conditions. It does not cover drift, coverage quality or product choice. Treat the rates as planning aids, not as guarantees. As a scale check, a 20 acre field at 2.45 acres per hour takes 20 divided by 2.45, which is 8.16 hours, so about 8.2 hours, before refill time and travel are added.
Frequently Asked Questions
Q: How many acres can a sprayer spray per hour?
A: A sprayer with a 60 ft boom at 10 mph and 80 percent efficiency covers 58.18 acres per hour before refill time, and 50.76 acres per hour after a 15 minute refill in the worked example. Your rate depends on boom width, speed, efficiency, tank size, application rate and refill time.
Q: How many acres can a 60 ft sprayer cover per hour?
A: At 10 mph and 80 percent efficiency, a 60 ft boom covers 58.18 acres per hour before refill time. At 85 percent efficiency, it covers 61.82 acres per hour. Refill time cuts both figures, so use the effective rate for planning the day.
Q: How does refill time change acres per hour for a sprayer?
A: Refill time cuts the effective rate because the total time per tank is spraying time plus refill time. In the large example, a 15 minute refill cuts 58.18 acres per hour to 50.76 acres per hour.
Q: What is acres per tank for a sprayer?
A: Acres per tank equals tank size divided by application rate. In the large example, 1000 gallons divided by 10 gallons per acre is 100 acres per tank. In the small example, 300 gallons divided by 15 gallons per acre is 20 acres per tank.
Q: Can I use the acres per hour calculator for spraying?
A: Yes. Enter the boom width actually in use, the average working speed and the efficiency band for your field in the free calculator on the homepage, or use the sprayer calculator for a sprayer focused form. Then work out the refill limited rate with your own tank size, application rate and refill time.
Q: Why is my sprayer slower than the table in this guide?
A: The table holds speed at 10 mph and efficiency at 80 percent. If your speed, efficiency or overlap differ, or your refill stops are longer, your effective rate will be lower. Check working width, speed, efficiency, tank size, application rate and refill time.
Plan On The Effective Rate
How many acres can a sprayer spray per hour is a question with two answers, and the useful one is the effective rate. The spraying rate tells you what the boom, speed and efficiency can do while the boom is moving. The effective rate tells you what the day will deliver once refill stops are counted. For a 60 ft boom at 10 mph and 80 percent efficiency, those two answers are 58.18 and 50.76 acres per hour in the worked example. Test your own figures in the free acres per hour calculator on the free calculator, work out your own refill limited rate, and plan the day on the effective rate.
