How to Calculate How Much Aggregate You Need for Your Project

When starting a landscaping, construction, or renovation project, one of the most common questions we hear is: "How much aggregate do I need?" Ordering the right amount is essential — too little can delay your project, and too much can lead to unnecessary costs.

At Lelo Aggregates, we’re here to help you get it right the first time. Here's a simple guide to calculating how much aggregate you need for your next project in North Wales.

Why Accurate Aggregate Calculation Matters

• Saves time and money – no repeat orders or excess waste.

• Keeps your project on track – avoids work stoppages.

• Ensures even coverage – especially important for decorative aggregates.

The Basic Formula for Calculating Aggregate Volume

To calculate the amount of aggregate required, you need to work out the volume of the space you're filling.

The basic formula is:

Length (m) x Width (m) x Depth (m) = Cubic Metres (m³)

Step-by-Step Guide:

1. Measure the area – use metres for best accuracy.

2. Decide on the depth – common depths are:

   • 50mm (0.05m) for decorative gravel

   • 100mm (0.1m) for driveways or heavy-use areas

   • 150-200mm (0.15-0.2m) for sub-bases or foundations

3. Use the formula to find your volume in cubic metres.

Example Calculation:

Let’s say you’re covering a garden path that’s 5m long, 1.5m wide, and you want a depth of 50mm (0.05m).

5m x 1.5m x 0.05m = 0.375m³

You’ll need approximately 0.375 cubic metres of aggregate.

Converting Cubic Metres to Tonnes

Aggregates are often sold by weight, so you might need to convert cubic metres into tonnes.

As a rough guide:

• 1 cubic metre of gravel = 1.4 to 1.5 tonnes

• 1 cubic metre of sand = 1.6 to 1.7 tonnes

• 1 cubic metre of crushed stone = 1.5 tonnes

Example:

0.375m³ of gravel x 1.5 = 0.56 tonnes (round up to 0.6 tonnes to be safe)

Quick Reference Depth Guide:

Depth	In Metres	In Millimetres
25mm	0.025m	25mm
50mm	0.05m	50mm
75mm	0.075m	75mm
100mm	0.1m	100mm
150mm	0.15m	150mm

Still Not Sure? Let Lelo Aggregates Help!

If you’re unsure about the amount you need, just get in touch with our team. With over 20 years of experience in supplying aggregates across North Wales, we’re happy to help you calculate and recommend the best products for your project.

Need Quality Aggregates Delivered Fast?

Browse our full range of gravel, sand, crushed stone, and decorative aggregates on our website or drop by our yard.

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