Lawn Feed Calculator — How Much Fertiliser for My Lawn
Calculate the right amount of lawn fertiliser for your grass area.
How We Calculate This
Feed quantity = Lawn Area × Application Rate × Number of Applications.
Granular feed rates: Spring 35g/m², Summer 25g/m², Autumn 30g/m². Liquid concentrate: ~10ml/m² — a 1-litre bottle of UK lawn-feed concentrate (e.g. Westland SafeLawn Liquid, Miracle-Gro EverGreen) covers about 100m². The made-up watering-can solution covers far more area per litre; this calculator counts the concentrate you buy, not the diluted volume — always check your product label as dilution rates vary.
Number of applications varies by season: summer may need 2-3 feeds, while spring and autumn typically need one (granular) or two (liquid).
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates based on standard gardening guidelines. Results may vary with soil conditions, climate, and plant varieties.