Ready-Mix Order Calculator — Loads, Part-Load & Pump

A standard UK ready-mix concrete truck carries 6 m³ (some companies offer 8 m³ trucks). Mini-mix trucks carry 1-4 m³ for smaller jobs or restricted access. Always round up your order volume — it's better to have a small amount left over than to run short mid-pour. Add 10% to your calculated volume for wastage and over-dig.

If you order less than a full 6 m³ truck, most ready-mix companies charge a part-load surcharge (typically £30-60). This covers the cost of the truck making a delivery that isn't at full capacity. If your total order is, say, 8 m³, you'll get one full load (6 m³) and one part load (2 m³) with a surcharge on the second delivery.

A concrete pump is needed when the truck can’t get close enough to discharge directly (within about 3m via the chute). Pumps cost £400–600 for a 4-hour minimum hire. For large pours (10+ m³) or difficult access, pumps actually save time and labour costs. For small slabs with good access, wheelbarrows from the chute are cheaper. See our Concrete Pumping Calculator for pump sizing and cost estimates.

Add 10% waste allowance for most jobs. This covers over-dig in foundations (uneven trench bottoms), spillage during placement, and small variations in levels. For carefully formed slabs, 5% may suffice. For deep trenches in clay (where the sides may crumble), allow 15-20%. It's always cheaper to order slightly more than to get a top-up delivery.

Specify the slump class when ordering: S2 (50-90mm) for floor slabs and general use, S3 (100-150mm) for foundations, trench fill and pumped concrete. Pumped concrete needs S3 minimum. Never add water on site to increase slump — this weakens the concrete. If you need a more workable mix, ask the batching plant to adjust the mix design.