# Pesticide Dilution Calculator

> Work out how much pesticide to add to a knapsack or tank from the label dose per litre, or from the active-ingredient strength you want (C1V1 = C2V2).

Category: Agriculture · Applies to: Worldwide · Last updated: 2026-10-29
Interactive calculator: https://calculators.geekmidst.com/calculators/pesticide-dilution-calculator

Multiply the label dose per litre by the spray volume, or dilute a concentrate to a target strength with C₁V₁ = C₂V₂. Always follow the product label.

Also called: Spray dilution calculator, Pesticide mixing calculator.

## Inputs
- Dose from (options: Label dose per litre, Active-ingredient strength; default dose)
- Label dose (unit ml or g per litre; default 2)
- Active ingredient in the product (unit %; default 25)
- Spray strength wanted (unit % a.i.; default 0.05)
- Spray volume per tank (unit L; default 15)
- Number of tank loads (default 4)

## Results
- Product per tank
- Water per tank (liquid product)
- Product for all tanks
- Total spray volume

## Formula

```
Label dose: Product = Dose per litre × Volume.  Strength: Product (ml) = Volume (L) × 1000 × C₂ ÷ C₁;  Water ≈ Volume − Product
```

Where:
- C₁: active-ingredient % of the product
- C₂: active-ingredient % wanted in the spray
- Volume: spray volume per tank in litres

## Worked example
1. Product per tank = 2 ml/L × 15 L = 30 ml.
2. Water = 15 L − 0.03 L = 14.97 L; for 4 tanks you need 120 ml of product.

**Result:** At 2 ml per litre, add 30 ml of product to each 15 L knapsack, 120 ml for four loads.

## What the result means

Measure the product with a graduated cylinder or syringe, part-fill the tank with water first, add the product, then top up to volume.

## Assumptions and limits
- The product is measured in ml (liquids) or g (powders) per litre, as on the label.
- Liquid product volume adds to the water volume.
- Does not check label limits, re-entry or pre-harvest intervals. The label is the legal instruction for use.
- For a dose per hectare, use the sprayer tank mix calculator.

## Questions

### What does 25 EC mean?

An emulsifiable concentrate with 25% active ingredient (often w/v). Use 25 as the product strength.

### Can I make the spray stronger for better control?

No. Higher than label rates can harm crops, leave illegal residues and speed up resistance.

## Related calculators
- [Sprayer Tank Mix Calculator](https://calculators.geekmidst.com/calculators/sprayer-tank-mix-calculator)
- [Ratio Calculator](https://calculators.geekmidst.com/calculators/ratio-calculator)
- [Percentage Calculator](https://calculators.geekmidst.com/calculators/percentage-calculator)

Source: GM¹X CalcVerse — https://calculators.geekmidst.com/calculators/pesticide-dilution-calculator