Concrete Mix Ratio Calculator

Calculate exact material volumes, weights, and dry mix ratios.

feet
feet
inches
% allowance
W: 0 L: 0 D: 0
Total Concrete Required Includes 5% waste margin
0.00 yd³
Total Estimated Weight
0 lbs
Cement (1 Part)Number of Bags / Total Weight
0 Bags
0 lbs
Sand (1.5 Parts)Volume / Weight
0.00 yd³
0 lbs
Aggregate/Gravel (3 Parts)Volume / Weight
0.00 yd³
0 lbs
Estimated Water NeededBased on 0.5 Water/Cement ratio
0 Gallons

1. Select your units: Choose between Imperial (Feet/Inches) or Metric (Meters/Centimeters) at the top left.

2. Choose the structure shape: Select either a Slab (for driveways, patios, square footings) or a Column (for sonotubes, round pads).

3. Enter dimensions: Input your measurements. The 3D visualizer will update immediately to verify your inputs.

4. Select Mix Ratio: Choose a standard grade (like M20 for typical foundations) or enter a custom ratio.

5. Download Report: Click the orange button to generate a professional, branded PDF detailing all required materials, volumes, and weights for purchasing.

Wet Volume Calculation:
Slab = Length × Width × Depth
Column = π × (Diameter / 2)² × Height

Dry Volume Conversion:
Concrete shrinks when mixed with water. We apply the industry-standard Dry Volume factor of 1.54.
Total Dry Volume = (Wet Volume × 1.54) + Waste Margin %

Ratio Distribution:
If ratio is 1:2:4 (Cement:Sand:Gravel), Total Parts = 7.
Cement Volume = Total Dry Volume × (1 / 7)
Sand Volume = Total Dry Volume × (2 / 7)
Gravel Volume = Total Dry Volume × (4 / 7)

Material Densities Assumed:
Cement: ~1440 kg/m³ (90 lbs/ft³)
Sand: ~1600 kg/m³ (100 lbs/ft³)
Gravel: ~1500 kg/m³ (95 lbs/ft³)

Concrete-Depot.com

Professional Mix Ratio & Material Calculation Report

Project ID:
Date:
Shape Profile:
Mix Ratio:
High-Level Summary
Total Material Volume
Total Estimated Weight
Cement Required
Input Parameter Metrics
Material Breakdown
3D Shape Visualization

Standard Structural Tolerances & Disclaimers: Calculations utilize an industry-standard wet-to-dry conversion factor of 1.54. Volumes and weights are estimates based on standard material densities (Cement: 1440 kg/m³, Sand: 1600 kg/m³, Aggregate: 1500 kg/m³). Actual site conditions, material moisture content, and mixing practices will affect final yields.

Always order slightly more material than mathematically required. A waste margin of % is included in this report.

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