Guides · Estimating
Cubic Feet to Cubic Yards: The Conversion Behind Every Estimate
By the MyBuildCalcHub team · Figures verified against our audited estimating engine · Updated
Why 27 runs the whole industry
Every material estimate on a job site is secretly this one conversion. You measure projects in feet and inches because that's what tape measures speak; suppliers sell concrete, gravel, mulch, and soil by the cubic yard because that's a truck-scale unit. The bridge is always the same: get the volume into cubic feet, divide by 27. It's worth internalizing rather than memorizing, because the derivation is three seconds long, three feet to a yard, cubed, and once it's yours, you can sanity-check any calculator, any quote, and any forum answer without a formula sheet.
The full formula, feet-and-inches edition
Depth is the wrinkle: plans quote it in inches while lengths come in feet. Divide the inches by 12 first, and the whole chain is:
Cubic yards = Cubic feet ÷ 27
Worked example: a 12 × 10 ft area dug 4 inches deep is 12 × 10 × 0.333 = 40 cubic feet = 1.48 cubic yards. That one line is the beating heart of every tool on this site, and it runs in reverse for removal jobs too, converting dig-out volume into the cubic yards a dumpster quote is priced in.
Conversion table, both directions
| Cubic feet | Cubic yards | Cubic yards | Cubic feet |
|---|---|---|---|
| 10 ft³ | 0.37 yd³ | 0.5 yd³ | 13.5 ft³ |
| 27 ft³ | 1.00 yd³ | 1 yd³ | 27 ft³ |
| 50 ft³ | 1.85 yd³ | 2 yd³ | 54 ft³ |
| 100 ft³ | 3.70 yd³ | 3 yd³ | 81 ft³ |
| 200 ft³ | 7.41 yd³ | 5 yd³ | 135 ft³ |
| 270 ft³ | 10.0 yd³ | 10 yd³ | 270 ft³ |
Reality checks that live next to the 27 rule
Three companions make the conversion practical. Wheelbarrows: a typical barrow moves 2–3 cubic feet, so a cubic yard is 9–14 trips, the number that decides where the delivery truck should dump. Buckets: a 5-gallon bucket holds about 0.67 ft³, roughly 40 buckets to the yard, which quietly retires most bucket-based plans. Weight: volume converts to pounds only through density, a yard of mulch is a few hundred pounds while a yard of gravel is about 2,800, so never let a "same size" pile promise a "same weight" haul. A full-size pickup bed illustrates the trap perfectly: by volume it holds roughly 2–2.5 cubic yards, but payload limits cap it at about a third of a yard of gravel, volume capacity and weight capacity are different ceilings, and dense material always hits the second one first. And when the volume in question is a slab, the coverage-per-yard tables apply the 27 rule for you at every standard thickness.
Cubic yards to cubic metres (and back)
The metric sibling of the 27 rule is worth carrying alongside it: one cubic yard = 0.7646 cubic metres, and one cubic metre = 1.308 cubic yards. The quick mental versions, "a yard is about three-quarters of a metre cubed" and "a cubic metre is about a third more than a yard", catch unit mix-ups before they become ordering mistakes, since a supplier quoting m³ against your yd³ estimate should always show the smaller number. Chained together, the two rules convert anything on a plan: feet-and-inches → cubic feet → ÷ 27 → cubic yards → × 0.7646 → cubic metres, the exact pipeline running inside every MyBuildCalcHub tool when you flip the unit toggle.
Frequently asked questions
How many cubic feet are in a cubic yard?
One cubic yard contains exactly 27 cubic feet, a yard is 3 feet, and 3 x 3 x 3 = 27. To convert cubic feet to cubic yards, divide by 27; to go the other way, multiply by 27.
How do I calculate cubic yards from measurements in feet and inches?
Cubic yards = length (ft) x width (ft) x (depth in inches / 12), all divided by 27. A 12 x 10 ft area at 4 inches deep is 12 x 10 x 0.333 = 40 cubic feet, which is 40 / 27 = 1.48 cubic yards.
How many wheelbarrow or bucket loads are in a cubic yard?
A cubic yard is about 9-14 wheelbarrow loads (a typical barrow carries 2-3 cubic feet) or roughly 40 five-gallon buckets, since a bucket holds about 0.67 cubic feet. Those numbers are the fastest reality check on any plan to move material by hand.