Fungicide Spray Dilution Calculator
Work out exactly how much fungicide to add per sprayer tank and for the whole field, from the label dose per acre and your spray volume.
Most contact fungicides are protective — spray before disease builds, ensure full coverage, and repeat after rain washes them off.
Always follow the product label — the label is the law. Verify doses, PHI and compatibility with the manufacturer and local regulations before spraying.
Farmers and spray operators use the free Fungicide Spray Dilution Calculator to mix the correct amount per tank — avoiding the under-dosing that wastes a spray and the over-dosing that wastes money, harms the crop and breaches residue limits.
About Fungicide Spray Dilution Calculator
Getting pesticide dilution right is the difference between control and a wasted, possibly harmful spray. Contact fungicides (WP) are commonly used at about 2–2.5 g per litre of water. This calculator takes the label dose per acre, your spray volume per acre and your tank size, and works out how much fungicide to add to each tank, the total product for the field, the concentration per litre and the number of tank loads. The product label always takes precedence — doses here are typical values to plan with.
How to use Fungicide Spray Dilution Calculator
- 1Enter the label dose per acre and your spray volume per acre.
- 2Enter your sprayer tank size and the area to spray.
- 3Measure out the fungicide per tank shown and spray with full coverage and PPE.
Why use Fungicide Spray Dilution Calculator?
- ✓Converts the per-acre dose into a per-tank amount instantly
- ✓Gives total product, total water and tank loads for the field
- ✓Works for any tank size and spray volume
- ✓Free, instant and fully in-browser — works offline in the field
Frequently asked questions
How much fungicide do I add per litre of water?+
Contact fungicides (WP) are commonly used at about 2–2.5 g per litre of water. The exact rate is on your product's label — divide the label dose per acre by your spray volume per acre to get the per-litre concentration, which this tool does for you.
How do I calculate fungicide per sprayer tank?+
Per-tank dose = label dose per acre × tank size ÷ spray volume per acre. For example, 400 g/acre at 200 L/acre in a 15 L tank is about 30 g per tank.
Why must I follow the label dose exactly?+
Most contact fungicides are protective — spray before disease builds, ensure full coverage, and repeat after rain washes them off. Over-dosing breaches Maximum Residue Limits (MRLs) and can be illegal; under-dosing fails to control the pest and breeds resistance. The label is legally binding.
Is this tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline in the field and your data never leaves the device.
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