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Units of Measureaka: short tonaka: US tonaka: T

Ton (material)

In Plain English

A unit of weight (2,000 pounds in the U.S.) used to price bulk materials like steel, asphalt, and aggregate.

Definition

In construction materials, a ton is a unit of mass commonly used for pricing and quantifying bulk materials such as asphalt paving, aggregate, gravel, crushed stone, steel, and soil. In the U.S., a short ton equals 2,000 pounds, while a metric ton (tonne) equals 1,000 kilograms (approximately 2,205 pounds). Structural steel is priced and estimated by the ton, and asphalt paving mix is ordered and placed in tons.

Why It Matters in Bidding

The ton is the pricing unit behind major structural and sitework line items, so estimators must convert plan quantities into accurate tonnage and confirm whether a quote uses short tons or metric tonnes. A units mismatch or a density error on asphalt or aggregate can distort a bid by a meaningful margin on tonnage-heavy projects.

Example

Estimating a parking lot overlay, the estimator converts the paving area and thickness into tons using the mix's compacted density, then verifies the asphalt supplier's quote is priced per short ton before locking the unit price into the bid.

Related Terms

Unit PriceCubic YardLump Sum

Frequently Asked Questions

Estimators calculate the compacted volume from area and thickness, then multiply by the material's unit weight to get tonnage. Asphalt and aggregate densities vary by mix and gradation, so use the supplier's or mix-design density rather than a generic figure. A density assumption error directly scales the tonnage and the bid amount.
A U.S. short ton is 2,000 pounds, while a metric ton (tonne) is 1,000 kilograms, about 2,205 pounds, roughly 10 percent heavier. Steel and imported materials sometimes quote in metric tons, so estimators should confirm the unit on every quote. Mixing the two silently understates or overstates the priced quantity.
Steel fabrication and erection pricing scales with weight, so members are quantified from the schedule by length and weight-per-foot, then summed into tons. The tonnage drives both fabricated material cost and erection crane and crew rates. Estimators should include connections, plates, and bolts in the weight, since these add up across a frame.

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