Concrete Slab and Cost Calculator
Volume = length × width × thickness; convert to m³ and apply extra material allowance.
Inputs and units
- Length: Enter your value in the format and unit shown.
- Width: Enter your value in the format and unit shown.
- Thickness (same unit): Enter your value in the format and unit shown.
- Dimension unit: Choose Metres, Centimetres, Millimetres, Feet, Inches.
- Extra material (%): Enter your value in the format and unit shown.
- Price per m³ (your currency): Enter your value in the format and unit shown.
- Bag yield (m³): Enter your value in the format and unit shown.
Calculation method
Volume = length × width × thickness; convert to m³ and apply extra material allowance.
Worked example
The example values are: Length = 5; Width = 4; Thickness (same unit) = 0.1; Dimension unit = m; Extra material (%) = 10; Price per m³ (your currency) = 120; Bag yield (m³) = 0.012
- Concrete (m³): 2.2
- Concrete (yd³): 2.8774913625
- Bags: 184
- Material cost: 264
Assumptions and limitations
Cost covers concrete only. Reinforcement, labor, delivery and structural adequacy are not included.
Using your result
Select Calculate after changing inputs. Copy result copies the displayed output; Download result saves a text file. Reset returns the form to its example inputs. Calculations run in your browser.
Concrete Slab and Cost Calculator FAQs
What method does this calculator use?
Volume = length × width × thickness; convert to m³ and apply extra material allowance.
What should I check before using the result?
Cost covers concrete only. Reinforcement, labor, delivery and structural adequacy are not included.