Pasadena concrete cost calculator
Enter the width and length in feet, pick a thickness, the kind of job and the finish. The job sets which installed rate is used; the finish adds exposed aggregate or stamping on top. Tick the box if an old slab has to come out first. Everything updates as you type.
Enter the size in feet (decimals work: 10.5 = 10 ft 6 in). Results update as you type.
- Area
- 400 sq ft
- Concrete to order
- 5.50 cu yd
- 4.94 cu yd in place, plus 10%, rounded up to the quarter yard
- Installed estimate, driveway or parking pad, broom finish (plain gray)
- $3,200 to $6,000
- About $8.00 to $15.00 per sq ft all in
- Delivered ready-mix only
- $820 to $974
- $149 to $177 per cu yd, no labor, base, steel or forms
Rates: constructlytools' Los Angeles guide (updated May 19, 2026): $8 to $15 per sq ft for driveways, patios and garage floors, $15 to $20 for pool decks, $12 to $20 for decorative and $15 to $20 for stamped finishes, $1.40 to $2.30 to tear out an old slab, and ready-mix at $149 to $177 per delivered yard. Steep hillside lots run $13 to $20+ per sq ft on the same guide. Published planning figures, not a quote: slope, access, steel and the site itself move a real price, and quotes vary by site.
Cubic yards of concrete by slab size
The same arithmetic for the sizes Pasadena homeowners ask about most, flat slab only, before any waste:
| Size (ft) | Area | 4 in | 5 in | 6 in |
|---|---|---|---|---|
| 10 x 10 | 100 sq ft | 1.23 | 1.54 | 1.85 |
| 10 x 20 | 200 sq ft | 2.47 | 3.09 | 3.70 |
| 12 x 12 | 144 sq ft | 1.78 | 2.22 | 2.67 |
| 12 x 16 | 192 sq ft | 2.37 | 2.96 | 3.56 |
| 16 x 20 | 320 sq ft | 3.95 | 4.94 | 5.93 |
| 20 x 20 | 400 sq ft | 4.94 | 6.17 | 7.41 |
| 20 x 30 | 600 sq ft | 7.41 | 9.26 | 11.11 |
| 20 x 40 | 800 sq ft | 9.88 | 12.35 | 14.81 |
| 24 x 40 | 960 sq ft | 11.85 | 14.81 | 17.78 |
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Thickened edges, footings and steps add concrete this table doesn't count.
Concrete cost per yard and per square foot
Two very different numbers get called the price of concrete. The ready-mix price is what the plant charges for a cubic yard delivered to the curb. The installed price is what a finished slab costs per square foot, with labor, base, forms, steel and finishing included:
| Price | Range | Source |
|---|---|---|
| Ready-mix, per cubic yard delivered | $149 to $177 | constructlytools, Southern California, 2026 |
| Driveway or patio, installed per sq ft | $8 to $15 | constructlytools, Los Angeles, 2026 |
| Stamped concrete, installed per sq ft | $15 to $20 | constructlytools, Los Angeles, 2026 |
| Pool deck, installed per sq ft | $15 to $20 | constructlytools, Los Angeles, 2026 |
| House foundation, installed per sq ft | $15 to $25 | constructlytools, Los Angeles, 2026 |
| Steep hillside lot, installed per sq ft | $13 to $20+ | constructlytools, Los Angeles, 2026 |
| Tearing out an old slab, per sq ft | $1.40 to $2.30 | constructlytools, Los Angeles, 2026 |
| Concrete finisher labor, per hour | $32 to $55 | constructlytools, Los Angeles, 2026 |
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Published figures for planning. Quotes vary by site.
On constructlytools' breakdown of a 500 sq ft Los Angeles driveway, labor is 42 to 52 percent of the job and the ready-mix only 24 to 28 percent. That is why the ready-mix price alone badly underestimates a slab. The driveway cost and patio cost pages break the installed price down by size.
Bags for small pads
For a small pad, bagged concrete can be enough. Quikrete prints its yields on the bag: about 0.60 cubic feet for an 80 lb bag and 0.45 for a 60 lb bag. At 4 inches thick:
| Pad (ft) | Cubic feet | 80 lb bags | 60 lb bags |
|---|---|---|---|
| 3 x 3 (AC pad) | 3.0 | 5 | 7 |
| 4 x 4 (landing) | 5.3 | 9 | 12 |
| 4 x 8 (trash cans) | 10.7 | 18 | 24 |
| 6 x 6 | 12.0 | 20 | 27 |
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No waste allowance included. Check the yield printed on the bag you buy.
Past about a cubic yard, roughly 45 of the 80 lb bags, hand mixing turns into a long day and a slab poured in batches that don't bond as one. That is where a ready-mix truck or a pump takes over.
Measuring a slab that isn't a rectangle
L-shapes and wraparounds
Split the shape into rectangles that don't overlap, run each through the calculator and add them. A driveway with a side parking pad is two rectangles; a patio that turns a corner of the house is usually two as well.
Circles and curves
A round area is 3.14 times the radius squared: a 12 foot round patio has a 6 foot radius, so 3.14 × 36 = 113 square feet. Enter it as roughly 10.6 x 10.6 and the volume matches. For a curved edge, measure to the widest point and let the waste allowance cover the difference.
Slopes
The top of a slab follows a planned slope, but low spots in the base make it thicker and use more concrete. On a Pasadena hillside lot, measure the excavation depth in several places and use the average, or set the waste to 15 percent. A cut deep enough to need a wall brings in the hillside permit rules.
Common concrete calculator mistakes
- Typing thickness in feet where the tool wants inches, or the reverse
- Measuring the old slab instead of the new one, which is often bigger
- Leaving out the apron, a side pad or the steps
- Forgetting thickened edges and footings on a garage or foundation slab
- Ordering the exact volume with nothing for an uneven base
- Pricing from ready-mix alone and leaving out labor, base, forms and steel
Foundations are a different calculation, with footings and grade beams from an engineer's plan; see concrete foundations in Pasadena.
