RHACOVA

Free contractor tool

Concrete Driveway Calculator

Enter the driveway length, width and slab thickness to see the cubic yards it takes, the allowance you choose to add, and the quantity to order. Every preset is editable.

Driveway dimensions

The starting values describe one example driveway so you can see the math. They are not a specification, a code requirement or a recommendation — replace them with the dimensions and thickness your job actually calls for.

Units

Switching converts what you typed, so the size stays the same. Units only — this never changes a currency.

Driveway length
Driveway width

Your spec, not ours. Thickness depends on loads, subgrade and local practice.

Your number, not ours. RHACOVA does not publish a standard allowance because the honest answer depends on your subgrade, forms and crew.

The step your supplier actually sells in. 0.25 is only a starting value.

Your result

Quantity decision

Order volume

Order quantityWaste-adjusted volume rounded up to your increment12.25 cu yd
Waste-adjusted volume12.222 cu yd
Base volume (geometry only)11.111 cu yd

Same volume in cubic feet

Base volume300.00 cu ft
Waste-adjusted volume330.00 cu ft
Waste allowance10.00% · 1.111 cu yd
Why this number?

cubicFeet = (lengthIn * widthIn * thicknessIn) / 1728; cubicYards = cubicFeet / 27; adjusted = cubicYards * (1 + waste); order = ceilToIncrement(adjusted)

Inputs

Length
480.00 in
Width
216.00 in
Thickness
5.00 in
Waste allowance
10.00%
Order increment
0.2500 cu yd

Results

Theoretical volume (cu ft)
300.00 cu ft
Theoretical volume (cu yd)
11.1111 cu yd
Waste allowance volume
1.1111 cu yd
Waste-adjusted volume
12.2222 cu yd
Order quantity
12.2500 cu yd

Formula concrete.rectangularSlab · engine shared.concrete@1.1.0 · rectangular-volume · rounding half-even to 6 decimals.

A quantity is not a bid

Cubic yards tell you what to order. What you charge still depends on material cost, loaded labor, equipment, overhead and the margin you need. RHACOVA carries this quantity into the job bid so you price it instead of guessing.

Price this pour: build the job bid

Still no account, and nothing you type leaves your device. Signing in only comes up if you choose to save the bid as an estimate.

A driveway is a slab with extra pieces

The main rectangle is the easy part: length × width × thickness. What gets missed is everything attached to it — the apron at the street, the flare where the driveway widens at the garage, a parking pad off to one side, and a thickened edge if the drawings call for one. Each of those is another rectangle. Calculate them as extra sections in the main concrete calculator and add the totals, rather than rounding the driveway up and hoping.

Presets are starting points

The example width and thickness on this page exist so the calculator shows a result the moment it loads. RHACOVA does not publish a recommended driveway thickness, a required width, a reinforcement schedule or a standard waste percentage — those depend on vehicle loads, subgrade, climate, local code and your own experience, and inventing a universal number would be dishonest. Change every field to match the job in front of you.

Formula and units

  • Cubic inches = length (in) × width (in) × thickness (in)
  • Cubic yards = cubic inches ÷ 46,656
  • Waste-adjusted volume = base volume × (1 + your allowance)
  • Order quantity = waste-adjusted volume rounded up to your increment

Common driveway mistakes

  • Leaving out the apron and the flare at the garage.
  • Using the paved width instead of the excavated width.
  • Pricing the driveway before the pour is broken into its actual pieces.
  • Treating one truck-load as the unit of measure instead of the volume.

Worked example

A 40 ft × 18 ft driveway at 5 in thick, with a 10% allowance and a 0.25 cu yd order increment:

  • Base volume: 300.00 cu ft
  • Base volume: 11.1111 cu yd
  • Waste allowance: 1.1111 cu yd
  • Order quantity: 12.25 cu yd

Other concrete quantities

After the quantity: cost, price, profit

  • True Job Cost Calculator

    A quantity is not a cost. Add material, loaded labor, equipment, disposal and the rest to see what the pour actually costs you.

  • Markup & Margin Calculator

    Turn that cost into a price, and see the margin the price actually leaves.

Learn the method