FDOT Earthwork Level 1 Practice Test 2026 – Complete Exam Prep Resource

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What is swell factor and how is it used in earthwork estimates?

Swell factor is the moisture content at compaction.

Swell factor is the density of compacted material.

Swell factor is the volume increase of excavated material; used to convert between in-situ volume and processed volume for borrow/spoil.

Swell factor describes how much volume increases when soil is excavated and loosened from its natural, compacted state. It tells you how the same mass of earth expands in volume after it’s broken up and prepared for transport or placement. In earthwork estimates, this is used to convert between the in-situ volume (the volume in the ground) and the volume you’ll actually handle as borrow or spoil once excavation has occurred.

For example, if the in-situ volume of material to be removed is 1,000 cubic yards and the swell factor is 1.15, you’d be dealing with about 1,150 cubic yards of excavated material. This conversion helps determine how much material must be hauled, stockpiled, or used as fill, and it influences project quantities and costs.

Swell factor is not the same as moisture content at compaction, nor is it the density of compacted material, nor the ratio of dry density to moist density. Those relate to moisture effects on density, not the volume change caused by excavation.

Swell factor is the ratio of dry density to moist density.