Pesticide Dose Calculator

Works out how much pesticide concentrate your field needs and how many sprayer tanks that dose fills.

Enter your numbers

Area to spray (acres)

Example: 2

Concentrate per acre (ml)

Example: 500

Sprayer tank size (ml)

Example: 500

Result

Currency

Figures are computed on your device; nothing is sent anywhere.

doseMl = acres * ratePerAcre; tankCount = ceil(doseMl / tankSizeMl)

Enter the area you are spraying in acres and the labelled rate of concentrate per acre from the product instruction.

Enter the tank size in millilitres, which is the capacity of the sprayer you will carry rather than the whole drum.

The tool multiplies the area by the rate for the dose in millilitres and then divides by the tank size, rounding up to whole tanks.

Mixing up concentrate and water measure, since the rate per acre refers to the chemical and not the total spray volume.
Rounding tank loads down, because half a tank still needs a full trip and under-dosing leaves part of the field untreated.

Use it before mixing so you measure the concentrate once and avoid over-dosing a whole field by mistake.
Use it to work out how many tank loads a block needs when you spray in portions rather than all at once.

For 2 acres at 500 ml per acre with a 500 ml tank portion, the dose is 1000 ml, which fills 2 tanks.

Dose (ml) 1,000.00

Tank fills 2

Should I use the dose per acre or per hectare?

This uses the rate per acre, so if your label is printed per hectare divide that figure by about 2.47 before entering it here.

Last updated: 2026-10-03