Free calculator
Gravel Calculator
Estimate gravel volume, approximate weight and bags from area, depth and editable density.
Open calculator →Garden project hub
Landscaping materials
Hard landscaping becomes easier to check when each layer and boundary has its own quantity.
Use the right quantity tool
Calculators for landscaping materials
Plan hard-landscaping quantities by separating area, depth, whole products, sheet layouts and linear edges.
Free calculator
Paving Slab Calculator
Work out a slab minimum and a separate order quantity using the slab dimensions and your chosen wastage allowance.
Open calculator →Free calculator
Patio Materials Calculator
Estimate paving, compacted sub-base, bedding and optional simple jointing quantities for a patio build-up.
Open calculator →Free calculator
Weed Membrane Calculator
Calculate membrane strips and whole rolls from roll dimensions, overlap and layout orientation.
Open calculator →Free calculator
Garden Edging Calculator
Calculate linear edging for beds, circles, paths, gaps and multiple runs, then convert to pieces or rolls.
Open calculator →Free calculator
Garden Sleeper Calculator
Estimate whole sleepers for straight runs, courses and rectangular raised-bed frames, including practical side-by-side counts.
Open calculator →Before you order
Keep the project decisions separate from the arithmetic
Start with the surface
Measure the footprint first. Gravel and sub-base use area × depth; paving slabs use slab coverage; membrane uses roll layout; edging uses a linear run. Do not force every material through the same formula.
Then plan the boundaries and layers
A patio can need slabs, bedding and compacted sub-base. A gravel area can need membrane and edging. The parent hub keeps those parts together while the Gravel and Paving hubs go deeper into their own workflows.
Whole products change the order
The mathematical quantity can be fractional; bags, slabs, rolls and sleepers cannot. Keep the base requirement visible, then round the purchase unit appropriately and apply any separate allowance explicitly.
Supporting guidance
Read the guide when the difficult part is choosing the input
Practical guide
How Deep Should Gravel Be?
Understand how a chosen gravel depth changes volume, weight and bag quantities for paths and decorative areas.
Read guide →
Practical guide
Paving Wastage Guide
Choose an ordering allowance for cuts, breakage, curves and patterns instead of assuming every patio needs the same percentage.
Read guide →Continue the project
Useful next routes
Move to the next quantity only when it describes a genuinely different part of the job.