Sprayer Calibration & Application Calculator

How to calibrate your sprayer

Before using any chemicals, you must first calibrate your sprayer with water only!

1. Fill with water

Fill your sprayer with a known amount of water (e.g. 2 litres) and note the starting volume.

2. Mark a test area

Mark out a test area (e.g. 5m × 5m = 25m²) using measuring tape, or count your paces.

3. Spray at normal pace

Walk at your normal, comfortable pace while spraying the test area evenly.

4. Measure remaining water

After spraying, measure how much water is left in the tank. The difference is your application rate.

Sprayer calibration

Water volume at start (litres) Water volume remaining (litres) Test area length (metres) Test area width (metres)

Water used: –

Test area: –

Your application pace: –

What this means: your sprayer applies – litres of liquid per hectare when walking at your normal pace.

Calculate job requirements

Area size calculation method

Total area to treat Area unit

Your sprayer tank capacity (litres)

Total water needed: –

Area per tank: –

Tank fills required: –

Planning: you'll need to fill your tank – times to cover the entire area.

Chemical/fertiliser mixing

Product application rate Application rate unit

Product per tank: –

Water per tank: –

Total product needed: –

Mixing instructions: enter your product's label rate above.

Application tips

Consistent pace

Always walk at the same speed you used during calibration. Count your steps or use a consistent rhythm.

Weather conditions

Apply when wind is less than 15 km/h. Avoid hot, sunny conditions that cause rapid evaporation.

Even coverage

Overlap spray patterns by 10–20% to ensure no gaps. Use a systematic pattern across your area.

Fresh mixing

Mix only what you need for each session. Some chemicals lose effectiveness when stored mixed (and may damage your sprayer). Flush thoroughly after use.