Arena Footing Calculator

Both dimensions multiply together to produce the arena's surface area, and that area is what gets multiplied by footing depth to get total volume -- so a 10% increase in length and a 10% increase in width produce the identical increase in sand, additive, and base material needed. There's nothing special about one dimension over the other in this formula; only the total square footage matters for sizing the footing project.

The additive percentage splits the same total footing volume between sand and additive rather than adding additive on top of a fixed sand quantity, so as additive share rises, sand's share of that volume falls proportionally. Because additive (rubber or fiber) is also lighter per cubic yard than sand, raising the additive percentage reduces both the sand tonnage and, to a lesser extent, the combined weight of the footing layer.

The base layer is a separate structural component from the footing surface -- it's the compacted crushed stone that provides drainage and a stable subgrade beneath whatever footing depth you choose for riding comfort. This calculator fixes base depth at 4 inches, a commonly used baseline for arena base courses, independent of the footing depth setting, so changing footing depth affects footing tonnage but not base material tonnage.

The cost estimate uses rough national-average per-ton prices for sand, additive, and base stone, but actual delivered prices vary substantially by region, hauling distance, and supplier, and additive products in particular range widely in price depending on the specific rubber or fiber blend. Treat the dollar total as a ballpark planning figure and get quotes from local aggregate suppliers using the tonnage figures this calculator produces for an accurate budget.