PLAN THE POUR. KNOW WHAT TO ORDER.

Concrete calculator

Calculate concrete in cubic yards, cubic feet and bags for slabs, footings and round pours. Add several areas to one project, then compare material costs and plan your order.

01 / INPUT

Build your estimate

Pour areasAdd slabs, footings or columns to one total.

Pouring around a fence or deck post? Use the post hole calculator to subtract the space taken by the post.

Extra for waste

Adjust for uneven ground and spillage.

Bag sizeCheck your chosen product label.

Yield per bag

ft³

Editable if your mix has a different yield.

Ready-mix price optional

Material price per cubic yard.

Price per bag optional

Compare material cost before delivery or labor.

CurrencyChanging currency clears prices; no exchange conversion.

Delivery planning (optional)

Use values from your supplier quote or vehicle manual. The defaults are examples to edit.

Truck capacity yd³Small-load threshold yd³Supplier order increment yd³Available pickup payload lb

02 / ESTIMATE

Your material list

Concrete with waste

0.00yd³

Exact volume0.00 yd³

Concrete bags0 bags

Volume in ft³0.00 ft³

Ready-mix at suggested order—

Bag material—

Bag weight—

Suggested supplier order—Rounded up to your entered order increment; check the supplier minimum.

Compare bag sizes

Bag	Quantity	Dry weight	Entered cost

Bag mix or ready-mix?

Pour breakdown

Order planning

Planning estimate only. Check dimensions, bag yield and delivery minimums with your supplier before ordering.

NEXT STEPS

Plan the rest of the pour

Estimate the gravel base Sketch a rebar grid quantity Build a full cost estimate Review the supplier checklist

Start with your project

Driveway calculatorLength, width, thickness and waste Patio calculatorVolume, bags and base planning Slab calculatorPatios, pads and driveways Footing calculatorStrip footings and trenches Bag calculator40, 60 and 80 lb mixes Post hole calculatorFence and deck posts

MORE PLANNING TOOLS

Check the details before ordering

Sonotube calculatorRound form tubes and piers Round slab calculatorCircular patios and pads Stairs calculatorSolid stepped pours Wall volume calculatorSolid cast-in-place walls Gravel base calculatorCompacted base volume Rebar grid calculatorBar lines and linear feet Concrete cost calculatorDelivery, fees and labor Cost per square footUse your supplier quote

THE METHOD

Know what goes into the number.

Each pour is calculated separately, then added together. Your waste percentage applies to the combined volume.

Measure the shape

For a slab, multiply length × width × thickness. For a round column, use π × radius² × height.

Allow for waste

The order amount is exact volume × (1 + waste percentage). You can change the default 10% allowance.

Choose how to buy

Compare bagged mix with ready-mix material cost using your own local prices. Delivery, labor and minimum order fees remain separate.

QUICK REFERENCE1 cubic yard = 27 cubic feet = 0.7646 cubic meters

Browse measurement and ordering guides

COMMON QUESTIONS

Before you place an order

How many 80 lb bags make one cubic yard?

At a typical yield of 0.60 cubic feet per bag, one cubic yard needs 45 bags. Always check the actual yield printed on your chosen mix.

How much concrete do I need for a 10 × 10 ft slab, 4 in thick?

The exact volume is 33.33 cubic feet, or 1.23 cubic yards. With 10% extra, plan for about 1.36 cubic yards or 62 bags of 80 lb mix.

Should I round up the ready-mix order?

The calculator includes your chosen waste allowance. Ask your supplier about minimum loads and delivery increments before you finalize the order.

Does this include labor, reinforcement or delivery?

No. The optional cost field multiplies order volume by your entered material price. Labor, rebar, pump fees, taxes and delivery are separate.