Concrete Driveway Calculator: Yards, Bags and Cost

Concrete Driveway Calculator

Estimate driveway area, concrete, whole bags, ready-mix, subbase, forms, joints and cost.

Measurement system

Driveway layout

Concrete thickness (in)

Driveway dimensions

Surface length (ft)Measure along the finished surface.

Width (ft)

Width at far end (ft)

Centerline radius (ft)

Arc angle (degrees)

Measured area (ft²)

Identical sections

Apron / extension area (ft²)

Extra allowance (%)

Slope, joints and aggregate subbase

Elevation change (ft)Optional. Length must be measured along the surface.

Maximum panel length (ft)Planning count only.

Subbase depth (in)

Loose subbase density (short tons/yd³)

Subbase extra (%)

Bags, ready-mix, trucks and cost

Mixed yield per bag (ft³)

Price per bag

Ready-mix price per yd³

Truck capacity (yd³)

Subbase price per short ton

Installed labor per ft²Optional planning input; local scope and prices vary.

Use actual bag yield and delivered supplier quotes. Costs exclude taxes, permits, reinforcement, demolition and short-load fees unless included in your rates.

Concrete to order—

—Total paved area

—Whole bags

—Bag / ready-mix project cost

—Edge forms

—Interior joints

—Subbase order

—Slope from entered rise

—Truck capacity equivalents

—Concrete-only cost

How to calculate concrete for a driveway

Select a straight, tapered, circular or measured-area layout. Enter finished surface dimensions and slab thickness. Add an independently measured apron or extension only when it is not already included in the main geometry.

Formulas

Straight area = length × width. Tapered area = length × (start width + end width) ÷ 2. Circular area = centerline radius × angle in radians × width. Concrete volume = total area × thickness. The allowance applies once before bags, ready-mix and truck capacity are calculated.

Checked example

A 60 × 12 ft driveway at 5 in thick has 720 ft² of area and 300 ft³ of concrete. With 10% extra, order 330 ft³ = 12.222 yd³ or 550 bags at 0.60 ft³ each. A 4 in subbase with 15% extra needs 10.222 yd³, approximately 14.31 short tons at 1.40 short tons/yd³.

Important limits

This calculator estimates quantities; it does not select slab thickness, strength, reinforcement, subgrade treatment, drainage, slope, joints or code compliance.
Surface length is measured along the finished driveway. Elevation change is used only to report approximate grade and angle; it does not change the entered surface area.
Joint counts are planning values. Type, depth, timing, isolation, reinforcement continuity and layout require project specifications.
Subbase density, compaction, waste, bag yield, ready-mix minimums, delivery, taxes and truck access must be confirmed locally.
The cost comparison includes only the editable concrete, subbase and labor inputs. Demolition, excavation, forms, reinforcement, finishing, sealing, permits and drainage are not added automatically.

Related calculators

Use the Concrete Calculator for a basic slab, the Gravel Driveway Calculator for layered aggregate, or the Rebar Calculator for reinforcement quantities.