The space you need to fill is not necessarily the loose quantity that arrives in a truck. The Whatson Sand Filling Calculator keeps final fill volume, delivery factor and truck capacity as separate inputs.
This makes it easier to discuss an order with a supplier. “One truck” is not a measurement until both sides agree how much that truck holds and how the quantity is checked.
Measure the space in one unit
Enter length, width and finished fill depth using the selected unit. With feet selected, a six inch depth is 0.5, not 6. The calculator treats the space as a rectangular volume.
The loose delivery factor multiplies that final volume. A factor of 1.15 represents 15% more loose material by volume in the estimate. It is an assumption you can change, not a universal compaction value.
The ordering allowance is another multiplier. Decide whether you genuinely need both adjustments; do not include the same delivery loss in each one.
Why 300 cft can produce two trips
Enter a 20 × 15 ft space with a final depth of 1 ft. Use a loose factor of 1.15, a 5% allowance and truck capacity of 300 cft.
The measured space is 300 cft, about 8.50 m³. The loose order is 362.25 cft. Dividing that by 300 and rounding up gives two truck loads.
That result does not say to buy 600 cft. It says two trips are needed if each trip can carry at most 300 cft. The second delivery can be partial if the supplier allows it.
Material charges and delivery charges are different
The sand price is PKR per cft and is multiplied by 362.25 in this example. Delivery is PKR per trip and is multiplied by two.
If the supplier charges a fixed price for each full load, this pricing model will not automatically reproduce that quote. Agree whether the second load is partial, full or subject to a minimum charge, then record any difference in your project budget.
Before the vehicle arrives
Confirm the delivery quantity and available access. Keep your assumed loose factor alongside the measured fill depth so another person can follow the estimate.
This worksheet does not specify compaction equipment, lift thickness or suitability of sand beneath a structural element. Use the project’s requirements for that work. For foundation pits with both spoil removal and backfill, the Excavation & Backfill Calculator separates those quantities more clearly than a single fill box.