Resources / Wet vs Dry Weight
Weight & tonnage
Wet vs Dry Weight
Aggregate is sold by weight. Water is heavy. Those two facts are the reason your delivered load sometimes doesn't match your volume estimate — and why it's not a billing error.
Last updated March 2026
Why it happens
Rock and sand absorb and hold water. A load pulled from a pile after rain can weigh meaningfully more than the same volume of dry material. Since you're paying by the ton, that weight difference shows up on your invoice — not because of any billing discrepancy, but because the material genuinely weighs more.
If you're converting from cubic yards to tons using a standard density factor, that factor assumes dry weight. A wet pile will deliver fewer cubic yards per ton than your estimate predicted.
How to order accordingly
Order by the ton, not the yard
You pay for weight, not volume. If a vendor quotes you cubic yards and you convert yourself, moisture already in the pile throws the math off. Get the tonnage number confirmed.
Add a 5–10% buffer on base work
Compacted base applications are the most sensitive to moisture variance. Don't assume delivered tons will hit your volume conversion exactly — build in the buffer.
Ask dispatch about current conditions
When dispatch confirms your delivery, ask what the pile is running. We haul from consistent sources, so we usually know. On a tight spec job, that 30-second conversation is worth it.
Need a tonnage estimate for your job?
Our field calculator uses material-specific density factors. Build in your moisture buffer before you order.