Asphalt Truckload Calculator — Loads, Last Load & Unused Capacity

Divide an order into deliveries without guessing. Enter order tons and truck capacity to get whole loads, the exact final-load tonnage, and the unused capacity that trips up scheduling and supplier minimums — plus a comparison across common dump-truck sizes.

Truckloads needed

2 loads

Full loads: 1 × 20 t
Final load: 20 t
Unused capacity: 0 t
Total hauled capacity: 40 t

Same 40-ton order across common truck sizes
Truck capacity	Loads	Final load (t)	Unused capacity (t)
10 t	4	10	0
14 t	3	12	2
16 t	3	8	8
20 t	2	20	0
25 t	2	15	10

How this was calculated

Loads40 t ÷ 20 t, rounded up2 loads
Final load40 t − 1 × 20 t20 t
Unused capacity20 t − 20 t0 t

Loads always round up — a partial truck still makes a trip.
Legal payloads follow the FHWA bridge formula and state permit rules; the capacities here are planning figures. Tandem dumps commonly haul 16–20 tons of HMA; tractor-trailer end dumps up to about 27 tons where legal.
Many plants set minimum deliveries (often 4–10 tons) and short-load fees. The unused-capacity figure is what to quote when asking about them.
Planning estimate, not engineering design. Verify quantities and legal load limits with your supplier and local authority before ordering.

The Formula

Loads = ceil(Order tons ÷ Truck capacity) • Final load = Order tons − (Loads − 1) × Capacity

How the Calculation Runs

Divide order tons by truck capacity and round up to whole loads.
Subtract (loads − 1) full capacities from the order to get the final load.
Unused capacity = truck capacity − final load.
The comparison table repeats all three steps for 10, 14, 16, 20, and 25-ton trucks.

What Each Variable Means

Symbol	Variable	Unit	Notes
Q	Order quantity	US tons	Tonnage to haul — use the order quantity (with allowance), not net.
C	Truck capacity	US tons	Payload per trip, limited by vehicle rating and legal weight rules.
N	Loads	trips	Always rounded up.
U	Unused capacity	US tons	Empty payload space on the final load — relevant to short-load fees and supplier minimums.

Entering Your Numbers

Order quantity (US tons)
Truck capacity (tons) — Typical tandem dump: 16–20 tons. Tractor-trailer end dump: up to ~27 where legal.

Known Limitations

Capacity is payload planning only. Actual legal loads depend on the FHWA bridge formula, axle configuration, state permits, and seasonal weight restrictions.
Haul time, plant queue, and paving speed decide how many trucks you need per hour — this tool sizes the order, not the fleet rotation.
Suppliers may impose minimum deliveries or short-load fees; the unused-capacity cell is the number to discuss with the plant.

Worked Examples

Every number below is produced by the same engine at build time — not typed by hand.

40-ton driveway job, tandem dumps

Truckloads needed: 2 loads

Loads: 40 t ÷ 20 t, rounded up = 2 loads
Final load: 40 t − 1 × 20 t = 20 t
Unused capacity: 20 t − 20 t = 0 t

55 tons with 20-ton trucks — the awkward last load

Truckloads needed: 3 loads

Loads: 55 t ÷ 20 t, rounded up = 3 loads
Final load: 55 t − 2 × 20 t = 15 t
Unused capacity: 20 t − 15 t = 5 t

Frequently Asked Questions

How many tons of asphalt does a dump truck hold?

A typical tandem-axle dump carries 16–20 tons of hot mix; single-axle trucks about 10–14; tractor-trailer end dumps up to roughly 27 tons where the FHWA bridge formula and state rules allow it.

How do I calculate asphalt truckloads?

Divide your order tons by the truck payload and round up. 55 tons on 20-ton trucks is 3 loads: two full and a final load of 15 tons with 5 tons of unused capacity.

Why does the last load matter?

A nearly empty last truck can trigger short-load fees or minimum-delivery charges, and it changes paving-crew scheduling. Knowing the final-load tonnage in advance lets you adjust the order or combine it with another pour.

Should I use net tons or order tons here?

Order tons — the quantity after allowance. Truckloads answer “what actually shows up,” and allowance material ships too.

Sources & Data Lineage

FHWA Bridge Formula Weights — legal load limits for trucks on the Interstate System. Reviewed 2026-09. ops.fhwa.dot.gov
FHWA Western Federal Lands Estimating Handbook — hot-mix asphalt density basis for the 145 lb/ft³ planning default. Reviewed 2026-09.