Concrete Pool Deck Calculator: Yards & Cost for Pool Surrounds
This calculator sizes the concrete for a pool deck or surround by using the deck's area minus the pool opening, at your chosen thickness. Enter your dimensions to get cubic yards, bag counts, and a ready-mix cost estimate for the slab around your pool.
Estimated concrete
Estimates only. Add ~5–10% for waste. Bag yields: 40 lb ≈ 0.30, 60 lb ≈ 0.45, 80 lb ≈ 0.60 cu ft. Concrete ≈ 150 lb per cu ft.
How to Use the Pool Deck Calculator
- 1
Enter your dimensions
Type the length, width and thickness of your slab, footing or pad and choose your units, feet, inches or meters.
- 2
Get instant volume
See the result in cubic yards, cubic feet and cubic meters, plus weight, the moment you type, no page reloads.
- 3
Buy the right amount
We convert volume into the exact number of 40, 60 and 80 lb bags, truck loads and cost so you order without waste or shortfalls.
The formula
cubic feet = (deck area ft² − pool area ft²) × (thickness_in ÷ 12); cubic yards = cubic feet ÷ 27
- ·deck area = total footprint of the poured deck (ft²)
- ·pool area = water/coping opening you subtract out (ft²)
- ·thickness_in = deck slab thickness (inches)
- ·12 = inches per foot, converting thickness to feet
- ·27 = cubic feet per cubic yard
Only the concrete ring around the pool is poured, so subtract the pool opening from the deck footprint before converting. A 10% waste allowance is added by default to cover slope, uneven subgrade, and spillage.
Worked examples
Example 1: 400 ft² net deck, 4-inch slab
- Net area = 600 ft² deck − 200 ft² pool = 400 ft²
- Thickness 4 in ÷ 12 = 0.333 ft
- Volume = 400 × 0.333 = 133.3 ft³
- Cubic yards = 133.3 ÷ 27 = 4.94, plus 10% waste ≈ 5.4
Result: ≈ 5.4 cubic yards
Example 2: 480 ft² net deck, 6-inch slab
- Net area = 800 ft² deck − 320 ft² pool = 480 ft²
- Thickness 6 in ÷ 12 = 0.5 ft
- Volume = 480 × 0.5 = 240 ft³
- Cubic yards = 240 ÷ 27 = 8.89, plus 10% waste ≈ 9.8
Result: ≈ 9.8 cubic yards
Concrete calculators by project type
Concrete bag yield & coverage
How much mixed concrete a standard bag yields, and how far a cubic yard goes at common slab depths.
| Bag size | Yield (cu ft) | Bags per cubic yard |
|---|---|---|
| 40 lb | 0.30 | 90 |
| 60 lb | 0.45 | 60 |
| 80 lb | 0.60 | 45 |
- 40 lb
- 60 lb
- 80 lb
Related guides
Pool Deck Concrete FAQs
How thick should a concrete pool deck be?
A concrete pool deck is typically poured 4 inches thick over a compacted base. Use 5 to 6 inches in areas where heavy equipment or vehicles may cross.
How do I calculate concrete for a pool deck?
Calculate the full outer area of the deck, subtract the pool's surface opening, then multiply the remaining area by the slab thickness. This calculator handles that subtraction so you only pour for the actual deck.
How much does a concrete pool deck cost?
Concrete material runs about $125 to $165 per cubic yard, so a 400-square-foot deck at 4 inches uses roughly 5 yards, or $625 to $825 in concrete. Decorative finishes like stamping add significantly to installed cost.
Should a pool deck slope away from the pool?
Yes, pitch the deck about 1/4 inch per foot away from the pool so water drains off rather than pooling or running back in. Proper slope also keeps debris and runoff out of the water.
What is the best concrete finish for a pool deck?
A broom finish or textured stamped finish is best because it stays slip-resistant when wet. Smooth troweled finishes get dangerously slick around a pool and should be avoided.
Do I need rebar in a pool deck?
Yes, welded wire mesh or #3 rebar in a grid is recommended to control cracking around the pool. Reinforcement is especially important because pool decks span variable, often disturbed backfill soil.
Why do I subtract the pool area from the deck area?
You only pour concrete on the walkable surround, not over the water. The calculator takes the total deck footprint and removes the pool opening so you order concrete only for the ring that is actually poured. Forgetting to subtract the pool can overstate your order by several cubic yards.
How wide should a concrete pool deck be around the pool?
A comfortable minimum is 3 to 4 feet of walkway around the perimeter, with wider zones of 6 to 10 feet on the side reserved for lounge chairs or a table. Wider decks add area quickly, so measure the actual poured shape rather than assuming a uniform border.
How much slope should a pool deck have for drainage?
Aim for about 1/4 inch of fall per foot, sloping away from the pool toward deck drains or the yard. This roughly 2% grade keeps splash-out and rainwater from pooling at the coping. The extra concrete needed for the slope is generally covered by the default 10% waste factor.
Do I need a thicker slab where deck furniture or a hot tub sits?
Yes. Standard foot-traffic deck is fine at 4 inches, but a spa, outdoor kitchen, or heavy furniture zone should be poured at 6 inches with reinforcement. Enter that thicker section separately, since it adds noticeably more concrete per square foot.
Should the pool deck be poured monolithically with the pool shell?
No. The pool shell and the deck are almost always separate pours with an expansion joint between them. This lets the deck move independently so seasonal soil movement does not crack the pool bond beam. Calculate only the deck volume here; the shell is a separate concrete quantity.
How many bags would a small pool deck take instead of ready-mix?
Divide the deck cubic feet by the bag yield: 0.60 ft³ for an 80 lb bag. A 133 ft³ deck would need about 222 bags, which is why anything over roughly a cubic yard is usually cheaper and faster with a ready-mix truck.
What causes a pool deck to crack, and can I plan for it?
Cracking comes from shrinkage, no control joints, and subgrade movement. Place control joints every 8 to 10 feet, keep the slab at least 4 inches thick with wire mesh or rebar, and compact the base well. These measures do not change the concrete volume but greatly improve durability.