How it works
What this calculadora actually does
If you want a sand gravel calculator without the sales pitch, the Sand & Gravel calculator keeps the maths honest and the steps visible, the way a spreadsheet would if you'd built it yourself.
If you keep running the same sand gravel calculator into a text message and squinting at the answer, park it on this page — share the URL instead, the maths travels with it.
Codes and Part M/L limits exist for a reason; this tool enforces them quietly. Measure twice, in the same unit — then size it up and the rest of this page explains what the answer means.
Work out tonnes of sand or gravel for a bed of a given depth and area, with common density for UK and BR suppliers.
On this page you will see Gravel, Ballast and Sand treated as first-class terms — each one is linked to the calculators and references that use it, so you can follow the thread without retyping queries into a search bar.
If it helps, jump straight to the Architecture hub or compare with the Concrete calculator and the Mortar calculator — those two calcs are the ones readers usually open right after this page.
Following the method end to end
Here's what happens when you plug real numbers in.
Work out tonnes of sand or gravel for a bed of a given depth and area, with common density for UK and BR suppliers.
When to use this calculadora
Sand & Gravel calculator is aimed at people arriving with questions like these:
- "Tonnes of gravel per m3"
- "Sand weight calculadora"
- "Ballast for concrete"
- "What is sand gravel calculator"
- "How to calculate sand gravel calculator"
- "Sand gravel calculator formula"
When to reach for something else
Every tool has an edge where it stops being the right answer. Sand & Gravel calculator is no exception:
- For legally binding tax or medical decisions — cross-check with HMRC, NHS or a qualified professional.
- For very large or very small extremes the rounding error outgrows the useful precision.
- When the underlying rate or threshold has changed since the page was last reviewed — always verify with the primary source.
- When the input you have is already a derived figure (net of something) — feeding it in as "gross" will double-subtract.
The snags that cost people the answer
Every time you size it up for a new scenario, one of these creeps in — it's worth knowing them ahead of time.
- Entering a monthly figure into an annual field (or vice versa).
- Forgetting a leading zero on decimals (.5 instead of 0.5 breaks some inputs).
- Trusting a single reading when the underlying number naturally fluctuates.
- Comparing two answers that used different assumptions — always re-run both.
- Skipping the formula box. If you don’t understand the method, the answer is just a vibe.
The sources behind the numbers
Where the maths needs an external authority, we cross-check against:
- BS EN 12620
- ABNT NBR 7211
Works well alongside
If this question keeps coming up for you, the same cluster of tools usually comes next:
- Concrete calculator — Work out concrete volume in m³ for slabs, footings or columns and the typical cement-sand-aggregate mix by weight.
- Mortar calculator — Estimate mortar required for brick or block walls in m³ and in 25 kg bags, including a 10% waste allowance.
- Bricks calculator — Estimate how many bricks you need per square metre of wall for UK standard bricks (65 mm) or Brazilian 8- and 6-hole ceramic bricks.
How we keep this accurate
Our calculadoras run on pure, unit-tested functions — the same logic lives in the browser and in the CI test suite. When tax rates, thresholds or official figures move, the update lands within 24 hours of the announcement. You can read the editorial policy and corrections policy.
Found an out-of-date number on Sand & Gravel calculator or anywhere else in the Architecture toolkit? Send it to the editorial desk and we'll patch it. Or browse the full calculadora directory for the next tool you need.