Approx calculation would put 1 inch (2.5cm, 0.025m) of compost across 1 acre (4025m2) to be: 100m3 per acre. A tipper lorry in the UK can take 12 ton (12000 kg). Compost density can range between 420-650 kg/m3. Let’s use an easy figure of 500 kg/m3 Each