Driveway Calculator

Yes. Use the "Driveway shape" dropdown to switch to circle (a turnaround pad), triangle, circular ring (a loop driveway around an island), or trapezoid (a driveway that widens toward the street). Each shape shows the measurements it needs and the area formula used is shown in the breakdown.

Most gravel driveways use two layers: a 4–6 in compacted base of larger crushed stone (like 3-4 in road base) for structure, and a 2 in top layer of smaller, more finished gravel for a smooth driving surface.

Yes — some suppliers deliver different gravel grades for base and surface separately. This calculator shows each layer's volume individually in the breakdown so you can order them as separate loads if needed.

Expect to add a fresh top layer every 2–4 years depending on traffic and weather, as surface gravel gradually migrates, compacts, or washes away.

Yes — a slight crown or cross-slope (about 1 in per foot of width) helps water drain off the surface instead of pooling, which extends the driveway's lifespan.

No — this calculator is for gravel driveways specifically. For a poured concrete driveway, use the Concrete Calculator with your driveway's dimensions and slab thickness.