Sprayer tank mix calculator
Enter the tank size, the spray volume you apply (gallons per acre or litres per hectare), the product rate from the label and the field size. The product rate can be in any unit (fl oz, pints, litres, kilograms): the amounts per tank come out in the same unit.
Runs in your browser: nothing you enter is sent anywhere.
How to use
- Choose US or metric units and enter the tank size.
- Enter the calibrated spray volume per acre or hectare.
- Enter the product rate from the label and the area to spray.
How it works
- area per tank = tank size ÷ spray volume;
- product per tank = area per tank × product rate;
- tank loads = field area ÷ area per tank, rounded up;
- last tank = the area left after the full tanks, times the spray volume and the product rate.
Example
A 600 L sprayer applying 200 L/ha, a product at 1.5 L/ha, a 10 ha field:
- 600 ÷ 200 = 3 ha per tank;
- 3 × 1.5 = 4.5 L of product per full tank;
- 10 ÷ 3 = 3.33, so 4 loads: three full tanks and a last one for 1 ha with 200 L of mix and 1.5 L of product;
- product for the whole field: 15 L.
In US units: a 300-gallon tank at 15 gal/ac covers 20 acres; at 32 fl oz/ac that is 640 fl oz per tank, and 40 acres take exactly 2 loads.
Tips and common mistakes
- Calibrate the sprayer before you trust the spray volume: worn nozzles and a different speed change it.
- Follow the label for mixing order, adjuvants and the minimum spray volume; this calculator does not check them.
- Rinse water left in the tank and boom dilutes the first load a little.
Frequently asked questions
How do I work out how much chemical to put in a sprayer tank?
First find how much area one tank covers: tank size ÷ spray volume per acre or hectare. Then multiply that area by the label rate. A 300-gallon tank at 15 gal/ac covers 20 acres, so at 32 fl oz per acre it takes 640 fl oz of product.
What is the spray volume or carrier rate?
The total amount of liquid (water plus product) the sprayer puts on per acre or hectare. It depends on the nozzles, pressure and travel speed, so calibrate the sprayer to know it.
How do I mix the last tank?
Only fill for the area that is left. The calculator shows how much spray mix and product the last tank needs, so you do not end up with leftover mix.
Does the product rate unit matter?
No: whatever unit the label gives (fl oz, pints, quarts, litres, kilograms or grams per acre or hectare), the amounts per tank and for the field come out in that unit.