Exposed Aggregate Concrete Cost Calculator

Calculator

Unit system

Length

Width

Thickness, inches or centimeters

Waste percentage

Concrete rate per volume unit

Aggregate finish rate per area unit

Labor rate per area unit

Finish complexity factor

Base preparation rate per area unit

Formwork rate per length unit

Reinforcement rate per area unit

Sealer rate per area unit

Equipment rental cost

Delivery fee

Disposal and cleanup fee

Tax percentage

Contingency percentage

Minimum contractor charge

Formula Used

Area = Length × Width.

Perimeter = 2 × (Length + Width).

Imperial volume = Area × Thickness ÷ 12 ÷ 27.

Metric volume = Area × Thickness ÷ 100.

Volume with waste = Volume × (1 + Waste percentage ÷ 100).

Concrete cost = Volume with waste × Concrete rate.

Labor cost = Area × Labor rate × Finish complexity factor.

Total = Subtotal + Tax + Contingency + Minimum charge adjustment.

How to Use This Calculator

Choose imperial or metric units.
Enter slab length, width, and planned thickness.
Add concrete, labor, aggregate, base, formwork, and sealer rates.
Enter tax, contingency, delivery, equipment, and cleanup costs.
Press Calculate Cost to view the result above the form.
Use CSV or PDF download buttons to save the estimate.

Example Data Table

Project	Size	Thickness	Waste	Use Case
Small Patio	12 ft × 14 ft	4 in	8%	Backyard sitting area
Driveway Bay	18 ft × 30 ft	5 in	10%	Residential vehicle slab
Garden Walkway	4 ft × 45 ft	4 in	12%	Long narrow path
Metric Terrace	6 m × 5 m	10 cm	7%	Outdoor entertainment slab

Planning Better Exposed Aggregate Work

Exposed aggregate concrete looks decorative, but its cost still starts with plain measured quantities. The slab area, thickness, waste factor, and local concrete rate create the base material estimate. Then the exposed finish adds more items. Decorative stone, surface retarder, washing time, sealing, edge forms, and curing care can change the final price. This calculator keeps those parts separate, so each allowance can be checked before bidding or ordering.

Why Accurate Inputs Matter

A small error in thickness can add a large volume change. A four inch driveway is very different from a six inch loading area. Waste also matters because exposed aggregate work needs enough mix for full placement. Short deliveries can leave cold joints, weak patches, or uneven exposure. Labor rates should include placement, screeding, exposing, washing, and cleanup. If your contractor prices those tasks separately, enter each rate in the closest matching field.

Cost Items To Review

Concrete is usually priced by cubic yard or cubic meter. Aggregate upgrades may be priced by square foot or square meter. Base preparation can include excavation, gravel, compaction, and grading. Formwork depends on the perimeter, not only the area. Reinforcement may include mesh, rebar, chairs, or fibers. Sealer cost should include coverage, product loss, and at least one coat. Delivery, equipment, disposal, tax, and contingency cover job conditions that are often missed.

Using The Estimate

Start with measured length and width. Use the planned slab thickness from drawings or site requirements. Enter current supplier prices, not old averages. Add a realistic waste percentage for small pours, irregular shapes, and pump work. Select a finish complexity factor when access, pattern borders, slopes, or tight washing windows make the job harder. Review the cost per area and cost per volume after calculation. These values help compare alternate thicknesses, sealers, or aggregate choices.

Final Check

The result is a planning estimate, not a binding quote. Site drainage, permits, reinforcement design, weather delays, and minimum load charges may affect the final invoice. Use the CSV and PDF options to save a record. Share the result with suppliers or contractors for clearer pricing discussions. Update entries whenever design depth, aggregate grade, or finish schedule changes during early project planning stages.

FAQs

What makes exposed aggregate concrete cost more?

It needs standard concrete plus decorative aggregate, retarder, washing time, sealing, and careful curing. Labor often rises because the crew must expose the surface evenly and clean residue before it hardens.

Does this calculator include reinforcement?

Yes. Enter a reinforcement rate per square foot or square meter. Use it for mesh, rebar, fibers, chairs, or a combined allowance from your supplier or contractor.

How much waste should I add?

Many small residential pours use five to ten percent. Irregular shapes, long pump lines, thick edges, and tight access may need more. Ask the ready mix supplier before ordering.

Can I use it for driveways?

Yes. Enter driveway length, width, and planned thickness. Driveways often need thicker slabs, stronger base preparation, and higher reinforcement allowances than patios or walkways.

What is the finish complexity factor?

It adjusts labor for harder work. Use a higher factor for borders, slopes, difficult access, custom stone exposure, hot weather, or projects needing very careful washing.

Why is formwork based on perimeter?

Forms run around the slab edges. A long narrow path may have more edge work than a square patio with the same area.

Does the estimate replace a contractor quote?

No. It is a planning tool. Soil, drainage, permits, minimum load charges, weather, and local labor availability can change the real job price.

What should I do before downloading the PDF?

Check every rate, unit, and allowance. Make sure thickness and waste match the project plan. Then download the PDF for records or contractor discussions.