Fertilizer Calculator
Work out fertilizer weight for a lawn or bed area.
Quick answer: enter your details below and click Calculate Fertilizer — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Enter your details below.
How to use
- Measure the area in square metres.
- Enter the label application rate in grams per square metre.
- Click Calculate Fertilizer.
About this tool
Enter the area and the application rate in grams per square metre, and the tool multiplies them into a total weight in kilograms, with a note to follow the product label. Over-application can damage plants, so the label rate matters more than any calculator.
Frequently asked questions
Does rain wash fertilizer away?
Heavy rain soon after application can move fertilizer off target, so check the label's weather advice.
Should I water after feeding?
Many granular products need watering in; the label will say.