Spray & Tank Mix Calculator & Mix It Right, Every Tank
Mixes pesticides
Turn a label dose into a foolproof mixing plan — total water and product for your area, the mix strength, the number of tank loads, and exactly how much product to add to each tank.
Knapsack ≈ 16 L · power sprayer 100–200 L · boom 400–600 L+.
For 2 acre you need 809.4 mL of product in 162 L of water — a strength of 5 mL/L. That's 11 × 16 L tank loads, adding 80 mL of product to each full tank.
Next: half-fill the tank with water, add the measured product, top up with water and agitate. Calibrate your sprayer to actually deliver 200 L/ha. Wear gloves and a mask, and never exceed the label dose.
Always follow the product label — it is the legal authority on dose, water volume, safety and pre-harvest interval. This tool is a mixing aid only.
Spray mixing — key facts
- Total water
- spray volume (L/ha) × area
- Total product
- dose per ha × area
- Field spray volume
- ≈ 150–250 L/ha
- Knapsack tank
- ≈ 16 L
- Boom sprayer
- 400–600 L+
- Mixing order
- water → product → top up
- Authority
- always the product label
- Privacy
- Runs in your browser; nothing uploaded
How the tank mix is worked out
Two numbers drive the whole job: the spray volume (water per hectare) and the label dose. Multiply spray volume by your area for the total water, and the dose by your area for the total product — that fixes the mix concentration. The tool then divides the total water by your sprayer's tank size to count the loads, and multiplies the concentration by the tank size so every full tank gets the same correct amount of product. The last tank simply holds the leftover water at the same strength.
Mixing by tank rather than guessing keeps every load at the label rate, which matters in both directions: under-dosing lets pests and weeds survive and build resistance, while over-dosing wastes money, harms the crop and leaves illegal residues. Combined with a properly calibrated sprayer, this turns the label into an exact, repeatable plan — but the label always remains the legal authority on dose, water volume, safety gear and the pre-harvest interval.
Mix per tank
Get the exact product to add to each knapsack, power or boom tank — no more guesswork.
Any dose format
Enter the label rate per hectare or per litre; the tool handles liquids and powders alike.
Buy the right amount
See the total product the whole job needs so you purchase neither too little nor too much.
Spray accurately
Hit the label rate every load to control pests effectively and avoid residues and resistance.
Frequently Asked Questions
How do I calculate how much pesticide to mix?+
Decide your spray volume (litres of water per hectare) and read the label dose. Multiply the dose per hectare by your area for the total product, and the spray volume by your area for the total water. This tool does both, then divides the job into sprayer tank loads and tells you how much product to add to each tank.
What is spray volume and what should I use?+
Spray volume is the amount of water you apply per hectare to carry the chemical — commonly 150–250 L/ha for field crops with a boom, and more for dense or tall crops sprayed by knapsack. Always use the volume the label recommends and calibrate your sprayer to actually deliver it.
Dose per hectare or per litre — which do I enter?+
Use whichever the label gives. 'Per area' (e.g. 1 L/ha or 500 g/ha) is the dose for a hectare; 'per litre' (e.g. 2 mL/L or 1 g/L) is a concentration in the spray water. The tool accepts both and converts between them automatically.
How much product goes in each tank?+
The tool multiplies the mix concentration by your tank size, so every full tank gets the same measured amount of product. The final tank usually holds less water, but at the same concentration — fill it with the leftover water and a proportional dose.
How do I mix the tank safely?+
Half-fill the tank with clean water, add the measured product with the agitator running, then top up with water to the mark. Wear gloves, eye protection and a mask, mix in a ventilated area away from wells and waterways, and triple-rinse empty containers.
Can I use this for herbicides and fungicides too?+
Yes — the maths is the same for any liquid or powder applied by spray, including herbicides, fungicides, insecticides, micronutrient and foliar feeds. Just enter that product's label dose and unit.
Why must I calibrate my sprayer?+
The calculation assumes your sprayer actually applies the spray volume you entered. If nozzles are worn or your walking/driving speed differs, the real rate will be off. Calibrate by spraying a measured area with water and checking the volume used, then adjust.
What is the pre-harvest interval (PHI)?+
The pre-harvest interval is the minimum time that must pass between the last spray and harvest so residues fall to safe levels. It's on the label and is legally binding — this tool helps you mix correctly but never overrides the label's PHI, dose limits or safety directions.
How do I convert mL/L to a per-hectare dose?+
Multiply the concentration by your spray volume: 2 mL/L at 200 L/ha is 400 mL/ha. Switch the tool to 'per litre' mode and it shows the total and per-tank amounts directly, so you don't have to convert by hand.
Is it safe to tank-mix two products?+
Only if both labels permit it and they're physically compatible. Do a small jar test first, add products in the correct order (usually water-dispersible granules, then wettable powders, then liquids), and keep agitating. When in doubt, spray them separately.