Garden & outdoor calculators
Estimate quantities for gravel, soil, mulch, patios, decking and fencing. Adjust supplier dimensions and allowances.
Gravel calculator
Estimate gravel volume, weight, bags and bulk quantities for paths and driveways.
Calculate materials →Patio slab calculator
Plan a rectangular patio laying grid, edge cuts and slabs to purchase.
Calculate materials →Decking calculator
Estimate board rows, approximate full-length boards and extra cutting allowance.
Calculate materials →Topsoil calculator
Calculate loose soil volume, approximate mass and bag quantities.
Calculate materials →Mulch calculator
Estimate bagged mulch volume for a rectangular garden bed.
Calculate materials →Fence panel calculator
Estimate standard panels, supporting posts and a possible short final section.
Calculate materials →Measure first. Order with confidence.
Start with your site measurements, then check any supplier-specific pack yield, density or product dimensions. These calculators give material estimates, not structural or safety certification. You can switch between UK and USA units without having a separate formula for each market.
How estimates are calculated →