Aggregate Volume – For 1:2:4 Concrete Mixes

This tool applies the formula Sand = V × 1.52 × 2/7; Gravel = V × 1.52 × 4/7 directly to the measurements you enter, so the result is an exact quantity rather than a rough guess. Because aggregate is priced and delivered per unit - cubic meters, square meters, bags or tonnes - a small measurement error multiplies across the entire order, which is why the calculation is worth doing properly. Worked example: For 6 m³ of 1:2:4: sand 6 × 1.52 × 2/7 = 2.6 m³; gravel 5.2 m³ - 4.2 t + 8.6 t delivered. One note from practice: Add a 5-10% waste margin to aggregate before ordering. Enter the concrete volume and mix ratio, check the totals, then round up to the nearest whole bag, sheet or roll before you place the order.

1. 1

   Take dimensions

   Note the concrete volume and mix ratio for the area you are covering or filling.

2. 2

   Run the calculation

   The calculator applies Sand = V × 1.52 × 2/7; Gravel = V × 1.52 × 4/7 the moment you type.

3. 3

   Check the breakdown

   Compare base quantity and waste-adjusted totals side by side.

4. 4

   Plan the purchase

   Use the final figure to price and schedule the delivery.

• Compacting thick lifts

• Forgetting stripping topsoil

• Under-ordering by truck