Measure • calculate • order
Know how much material your project needs.
Free, practical calculators for garden and building projects. See the calculation, adjust the assumptions, and turn a measurement into a useful shopping quantity.
Start with your material
Each tool answers a different ordering question. Measure the finished area and layer depth first; then check your supplier’s actual density, bag yield or package size where available.
Gravel calculator
Combine path sections, use supplier density, and compare bags with bulk delivery.
Slabs & patiosConcrete calculator
Work out pour volume, a measured allowance, ready-mix order rounding and bags from the product yield.
Garden bedsMulch calculator
Measure a fresh or top-up layer; compare litres, bag counts and bulk volumes.
Lawns & bedsTopsoil calculator
Plan added fill volume, supplier-based weight, bag sizes and settling reserve.
Bedding & fillSand calculator
Compare measured volume, supplier-based weight, and orders by bags or bulk.
From measurement to order
Split irregular areas into simple sections. Record the actual layer depth you will add.
Change density, allowance or product yield when your supplier gives a better value.
Compare the calculated need with whole bags and the supplier’s delivery increments.
A calculator gives a planning estimate. The final order can differ because of ground levels, moisture, compaction, packaging and site losses. See our formulas and limitations for the details.
More project calculators
Need a different kind of estimate? These tools use distinct inputs such as coverage, unit dimensions or project layout.
Useful before you buy
AmountHub is an independent project. We explain our assumptions and welcome corrections through the contact page.