Interior concrete floor planning
Free Concrete Floor Cost Calculator
This free concrete floor cost calculator prices interior floors as a slab plus a finish. Pick polished, stained or sealed, or switch to topping mode to price a thin pour over the slab you already have.
Reviewed September 1, 2026 by Sam Johnson from the Concrete Calculators Editorial Team. Published formulas and editable planning assumptions are identified below.
Estimated total cost
point estimate, see range below
- Likely range
- $3,760 to $5,042
- Concrete
- 4.25 cu yd, $701
- Gravel base
- 5.2 tons, $167
- Vapor barrier
- $150
- Wire mesh
- $105
- Placing labor
- $1,350
- Grind and polish
- $1,800
- Cost per area
- $14.24 per sq ft
Polish pricing here is a basic single color grind. Higher gloss levels and decorative cuts are quoted per job, so treat the range as a floor.
Take this estimate with you
How the concrete floor cost calculator works
The slab part works like any pour: concrete with waste at your ready mix price, a gravel base, a vapor barrier at $0.50 a square foot, mesh or rebar, and placing labor at $4.50 a square foot.
Floor finishes and what they add
The finish is where the concrete floor cost calculator differs from an outdoor slab. Cure and seal adds $0.75, stain and seal $4.00, and grind and polish $6.00 per square foot, our stated assumptions for a basic single color job.
Topping mode over an existing slab
Topping mode prices a thin bonded pour over an existing sound slab, and drops the base, barrier and reinforcement lines because the old slab already does those jobs. When the truck cannot reach the room, the pump or buggy option adds a $650 day.
Pricing an outdoor slab with a broom or stamped finish instead? Use the concrete slab cost calculator. If you only need yardage and bag counts, the concrete calculator gets you there in three inputs.
Concrete floor cost by size
A new 4 inch interior floor with a vapor barrier, mesh and a cure and seal finish runs about $8.95 per square foot installed. Rows below come from this concrete floor cost calculator at its default prices.
| Floor size | Area | Concrete to order | Point estimate | Likely range | Per sq ft |
|---|---|---|---|---|---|
| 10x12 ft | 120 sq ft | 1.75 cu yd | $1,087 | $957 to $1,283 | $9.06 |
| 12x20 ft | 240 sq ft | 3.5 cu yd | $2,175 | $1,914 to $2,566 | $9.06 |
| 20x20 ft | 400 sq ft | 5.5 cu yd | $3,570 | $3,141 to $4,212 | $8.92 |
| 24x30 ft | 720 sq ft | 10 cu yd | $6,442 | $5,669 to $7,602 | $8.95 |
| 30x40 ft | 1,200 sq ft | 16.5 cu yd | $10,709 | $9,424 to $12,637 | $8.92 |
Swap the finish and the whole column moves: grind and polish adds $6 per square foot over a plain cure, stain and seal $4. Topping mode over a sound existing slab drops the base, barrier and reinforcement lines entirely.
Concrete floor finish prices
All rows are a 20 by 15 ft new interior slab with our defaults. The adder is the finish line item alone, per square foot.
| Finish | Adds per sq ft | Floor total | What you get |
|---|---|---|---|
| Plain cured | $0 | $2,473 | A hard troweled grey slab, ready for flooring later |
| Cure and seal | $0.75 | $2,698 | Dust proofed and stain resistant, shop and garage grade |
| Stain and seal | $4.00 | $3,673 | Color from acid or water based stain under a sealer |
| Grind and polish | $6.00 | $4,273 | Ground flat and polished, the exposed concrete look |
Polish pricing here is a basic single color grind at a standard sheen. Higher gloss levels, dyes and decorative sawcuts are quoted per job and go up from there.
What the floor cost calculator does not include
- Demolition is outside this estimate. Tearing out tile, old toppings or a bad slab is its own line and often the biggest surprise on a renovation.
- Moisture mitigation. A damp existing slab needs testing and possibly an epoxy moisture barrier before any finish goes down.
- Getting concrete to the room beyond the pump option. The $650 pump or buggy day above is a stated single day assumption; a boom pump or a second day is quoted per job.
- Surface prep for a topping. Bonded toppings need the old slab ground, cleaned and primed, or they delaminate.
- Moving furniture, protecting finished walls, and climate control while the sealer cures.
Straight answers
Concrete floor cost questions
Open a question for the practical answer, including the assumptions behind the number.
How much does a polished concrete floor cost?
Polishing adds about $6 per square foot in the concrete floor cost calculator, a typical figure for a basic single color grind. As a complete new floor, our 20 by 15 example lands at $4,273, about $14 per square foot including the slab itself.
Can I pour a new concrete floor over an existing slab?
Yes, and the concrete floor cost calculator prices it as a bonded topping of 1.5 to 2 inches over sound, clean, primed concrete. Switch the calculator to topping mode and it drops the base, barrier and reinforcement lines automatically.
How thin can a concrete topping be?
About 1.5 inches for a bonded topping using a small aggregate mix. Anything unbonded, over a cracked or contaminated slab, needs 3 inches or more and behaves like a new floor.
Do interior concrete floors need a vapor barrier?
New interior slabs, always. Ground moisture rising through the slab clouds sealers, delaminates coatings and ruins flooring installed later. A topping relies on whatever barrier the original slab has.
Is a stained floor cheaper than a polished one?
Upfront, yes, by about $2 per square foot in our assumptions. Polish tends to win over time because the wear surface is the concrete itself, while stained floors depend on the sealer coat being renewed.
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Concrete guides to read next
- Vapor barrier under concrete slab
When it is required, what mil to use, and why the sand layer argument was settled.
- How long does concrete take to dry
Walk on it at 24 hours, drive on it at 7 days, full strength at 28. What moves those numbers.
What changed on this page
- Per field unit choice added.
- Copy, email and print estimate actions added.
- Pump or buggy day option added at $650, a stated planning assumption.
Prices and formulas are reviewed on the schedule described in our methodology.