How it works
A sprayer applies a fixed volume of carrier per acre, set by calibration. Dividing the tank size by that rate gives the acres one tank covers, and the label rate per acre times those acres is the product to put in the tank.
For a partial tank, use the same rate with the acres you will spray. Always fill and mix in the order the label requires, and run the sprayer’s calibrated gallons per acre.
Worked example
A 300 gal tank at 15 gal/acre, applying 32 fl oz per acre over an 80 acre field:
- Acres per tank = 300 gal ÷ 15 gal/ac = 20 ac
- Product per tank = 32 per acre × 20 ac = 640
- Tanks for 80 ac = 80 ÷ 20 = 4
- Total product = 32 × 80 ac = 2,560
| Input | Value |
|---|---|
| Tank size | 300 gal |
| Carrier rate (spray volume) | 15 gal/ac |
| Label rate per acre | 32 units per acre |
| Field size | 80 ac |
| Result | Value |
|---|---|
| Acres covered per tank | 20 ac |
| Product per full tank (label units) | 640 units |
| Tanks for the whole field | 4 tanks |
| Total product for the field (label units) | 2,560 units |
| Carrier for the whole field | 1,200 gal |
Assumptions and limits
- The carrier rate is your calibrated output; this tool does not calibrate the sprayer (see the sprayer calibration calculator).
- The label rate is your input, in the label’s own units. This calculator does not know any product’s rate or restrictions.
- Mixing order, tank mix compatibility, and water quality are set by the label.
Common questions
How much chemical do I add per tank?
Multiply the label rate per acre by the acres one tank covers, which is tank size divided by gallons per acre.
What if I am filling a partial tank?
Use the same product per acre times the acres you will spray, then add water to the volume that covers those acres at your carrier rate.
Where do I get the carrier rate?
From a sprayer calibration, which measures the actual gallons per acre at your speed, pressure, and nozzles.
Which units does the product use?
Whatever the label uses. Enter the rate in those units and read the result in the same units.
Sources
- Sprayer calibration arithmetic used by university extension guides: acres per tank = tank volume ÷ gallons per acre; product per tank = rate per acre × acres per tank.
Updated 2026-09-30