M20 Footing Concrete Calculator(Foundation Volume, Cement, Sand & Aggregate)
Calculate footing concrete volume and materials.
Estimate M20-style footing concrete materials with cement, sand, aggregate, and wastage. Adjust footing dimensions, count, mix ratio, and wastage for your foundation estimate.
🕒 Last updated: April 12, 2026
Inputs
Showing results for 8 footings
Concrete Volume
8.100 m³
(1.012 m³ per column)
Total Wet Volume: 8.100 m³
Dry Volume: 12.474 m³
Sand: 3.402 m³
Aggregate: 6.804 m³
(Per column: Sand 0.425 m³, Aggregate 0.850 m³)
Cement Required
(Including 5% Wastage)
69 bags
(9 bags per footing)
Extra (Wastage): 3.27 bags
Approximate results for planning only. Verify with a professional.
You can use our beam load calculator to estimate the load acting on beams and understand how structural loads are distributed across the building.
For vertical structural members, use the concrete column calculator to calculate column volume and material requirements.
To estimate beam concrete quantities, use the concrete beam calculator for accurate material estimation.
Once beams are completed, slabs are constructed over them. Use the concrete slab calculator to estimate concrete volume and material requirements for slabs.
Popular concrete footing calculator examples
M20 footing material estimate
This page uses a 1:1.5:3 nominal mix for footing concrete material planning.
The calculator is pre-filled for this footing use case. Edit any input and the worked example updates from the active values.
- Mix: 1:1.5:3.
- Count: 8 footings.
- Includes cement bags.
What is a Concrete Footing Calculator?
A concrete footing calculator helps estimate the volume of concrete and the quantity of materials such as cement, sand, and aggregate required for constructing RCC footings. Footings are the base of a structure that transfer loads from columns to the soil.
This calculator is useful for civil engineers, contractors, and homeowners to estimate concrete requirements for foundations. It considers dry volume, mix ratios, and wastage, making it suitable for practical construction planning.
- Estimate concrete volume for footings
- Calculate cement, sand, and aggregate quantities
- Plan materials for multiple footings
- Reduce wastage and cost overruns
- Improve construction planning accuracy
How does the concrete footing calculator work?
The calculator uses standard formulas to compute footing volume and material quantities based on dimensions, mix ratio, and number of footings.
Step 1 — Calculate Footing Volume
All dimensions must be converted into meters before calculation.
Step 2 — Convert to Dry Volume
The factor 1.54 accounts for voids in aggregates, sand bulking, and material loss.
Step 3 — Material Calculation
For M20 concrete (1:1.5:3):
Step 4 — Convert Cement to Bags
Step 5 — Add Wastage
Calculation example for M20 Footing Concrete Calculator
This example uses the active concrete dimensions, mix ratio, and wastage from this programmatic calculator page.
- Length = 1.5 m
- Width = 1.5 m
- Footing Thickness = 450 mm
- Footing Count = 8
- Mix Ratio = 1:1.5:3
- Wastage = 5%
Step 1 - Calculate wet volume
Wet Volume = 8.1 m³
Step 2 - Convert to dry volume
Dry Volume = 12.474 m³
Step 3 - Split concrete materials
Cement Bags = 68.63 bags
Sand Volume = 3.402 m³
Aggregate Volume = 6.804 m³
For this page, the active inputs estimate about 68.63 cement bags, 3.402 m³ sand, and 6.804 m³ aggregate.
Worked Example: Concrete Footing Calculation
Let’s calculate concrete required for 4 footings:
- Length = 1.5 m
- Width = 1.5 m
- Thickness = 300 mm (0.3 m)
- Number of Footings = 4
- Concrete Mix = M20 (1:1.5:3)
Step 1 — Wet Volume
Step 2 — Dry Volume
Step 3 — Materials
Step 4 — Cement Bags
Step 5 — With Wastage
Concrete Mix Ratios for Footings
Footings require strong concrete as they transfer structural loads to soil. Higher grade concrete ensures better stability and durability.
- M20 (1:1.5:3) → Common for residential footings
- M25 (1:1:2) → Used for heavier loads
- M30+ → Used for high-rise structures
When should you use this concrete footing calculator?
- Before laying building foundations
- For estimating materials for multiple footings
- For cost planning and budgeting
- For comparing different concrete mix grades
- During site planning and execution
Limitations of this calculator
- Does not include reinforcement steel
- Assumes uniform footing dimensions
- Does not account for soil bearing capacity
- Actual material usage may vary on site
Common mistakes in footing calculation
- Incorrect unit conversion
- Ignoring number of footings
- Not applying dry volume factor
- Incorrect mix ratio selection
- Ignoring wastage
Disclaimer: This calculator provides approximate results for planning and estimation purposes only. Actual requirements may vary based on site conditions, materials, workmanship, and local building regulations. Always consult a qualified engineer, architect, or construction professional before making final decisions.