Post Concrete Calculator — Postcrete & Concrete
Work out how much postcrete or concrete you need for fence posts.
How We Calculate This
Postcrete: typically 1 x 20kg bag per post for standard 75mm posts in 300mm diameter holes, 600mm deep.
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.