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How many acres will a 25 gallon sprayer cover?

Divide the tank size by your calibrated application rate in GPA: a 25 gallon tank at 20 GPA covers 1.25 acres. Drop the GPA to 15 and the same tank stretches to 1.67 acres, so the gallon number painted on the tank never answers the question by itself.

3 min read · Updated 2026-09-07

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The number on the tank is not the answer

The honest answer to how many acres a 25 gallon ATV sprayer covers is: it depends what GPA it's running at, and that follow-up question rarely gets asked first.

Acres per tank is tank size divided by application rate (GPA), full stop. A 25 gallon tank at 20 GPA covers 25 ÷ 20 = 1.25 acres. The same 25 gallons at a lighter 10 GPA covers 2.5 acres, because you're spreading the same water over twice the ground.

Acres per tank, by tank size and application rate (GPA)
Tank size10 GPA15 GPA20 GPA25 GPA
15 gal1.5 acre1 acre0.75 acre0.6 acre
25 gal2.5 acre1.67 acre1.25 acre1 acre
55 gal5.5 acre3.67 acre2.75 acre2.2 acre
60 gal6 acre4 acre3 acre2.4 acre

Use the table for a ballpark. For your own sprayer, pull the real Covers per Tank number from SprayMaster's free Tank Mix instead — the rate you were actually calibrated at is almost never a round one.

Getting the exact number in the app

  1. Open Tank Mix from the Calculators section.
  2. Set Units to US (or Metric for litres and hectares).
  3. Set Rate Basis to Per Acre. Label Rate can stay at 0 — it has no effect on Covers per Tank.
  4. Under Your Sprayer, type your Tank Size and the Application Rate (GPA) you calibrated your sprayer at.
  5. Read Covers per Tank under Mix. That is your answer, in acres.

One thing to watch for here: the screen will not show Covers per Tank at all if Rate Basis is Per Gallon, because a per-gallon label has no acreage figure to give — the app just mixes water, not land. Switch to Per Acre or Per Hectare to get the acres back.

From acres per tank to tanks for the whole field

Say your 25 gallon tank, calibrated at 20 GPA, covers 1.25 acres per load, and you're spraying a 10 acre field. Turn on Size a whole job, type 10 in Total Area, and Tanks for Job reads 8 — exactly 10 ÷ 1.25, with no rounding up.

25 gal tank at 20 GPA, 10 acre field
FieldValue
Covers per Tank1.25 acre
Total Area10 acre
Tanks for Job8

Why this number is the one that matters, not the tank's gallons

A bigger tank does not always cover more ground per fill once you account for rate. A 500 gallon tank at 25 GPA covers 20 acres a load; a 60 gallon tank at 10 GPA covers 6 acres, more per gallon carried because it's laying down less water per acre. Tank size tells you how often you stop to refill, not how far one load reaches — GPA decides that.

  • If you don't know your real GPA, SprayMaster's Sprayer Calibration (Pro) gets it from nozzle output, speed and spacing, or from a catch test.
  • A manufacturer's spec sheet GPA is a starting point, not a substitute for calibrating your own machine with its own worn tips and pressure.
  • Covers per Tank assumes the whole tank gets used; a sprayer that runs dry mid-field covered less than the number says.

Questions and answers

How many acres will a 15 gallon sprayer cover?
Tank size divided by GPA. At 20 GPA, a 15 gallon tank covers 0.75 acre; at 10 GPA it covers 1.5 acres. Type both numbers into SprayMaster's Tank Mix to get your own figure instead of a ballpark.
How many acres will a 60 gallon sprayer cover?
At 20 GPA, 3 acres per tank; at 10 GPA, 6 acres. A 60 gallon tank running light (10 GPA) out-covers a 25 gallon tank running heavy (25 GPA) by a wide margin, even though it's a smaller gallon number per acre of water.
How many acres will a 55 gallon sprayer cover?
2.75 acres at 20 GPA, 2.2 acres at 25 GPA. Same formula every time: tank gallons divided by gallons-per-acre.
How many gallons per acre should I spray?
SprayMaster has no opinion on that; it is set by your product label and your sprayer's real calibrated output, not a universal number. Common broadcast rates run roughly 10 to 25 GPA, but check your label and your calibration before assuming either end of that range.

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