TryBuildCalcCement Sand Aggregate Calculator(Concrete Materials by Ratio)
Calculate cement bags, sand, aggregate, water, and optional material cost for concrete using common nominal mix ratios or grade presets.
Estimate concrete materials by ratio or grade.
🕒 Last updated: August 14, 2026
Inputs
Material Settings
ℹ️Default 1.54 for concrete material estimation.
ℹ️Typical range: 0.45 to 0.50 for nominal concrete estimation. Lower values may need better compaction or admixture.
Cost Settings
Theoretical Materials
6.34 bags
Cement Weight: 316.8 kg
Cement Volume: 0.22 m³
Sand: 0.44 m³ (15.54 ft³)
Aggregate: 0.88 m³ (31.08 ft³)
Water: 158.4 liters
Wet Volume: 1 m³ (35.31 ft³)
Dry Volume: 1.54 m³ (54.38 ft³)
Ratio Used: 1:2:4
Recommended Materials
(Including 5% Wastage)
6.65 bags
Cement: 332.64 kg (0.231 m³)
Sand: 0.462 m³ (16.32 ft³)
Aggregate: 0.924 m³ (32.63 ft³)
Water: 166.3 liters
Water-Cement Ratio: 0.5
Cement, sand, and aggregate from volume and ratio
This page focuses on the three core materials — cement, sand, and aggregate — computed together from your concrete volume and mix ratio in one result.
Edit the volume, ratio, or wastage above and all three material quantities update together, since they're split from the same dry volume using the same ratio.
- Cement is shown in bags (and kg); sand and aggregate are shown in m³ and cft.
- All three materials come from the same dry-volume split — changing the ratio changes all three proportionally.
- Water requirement is also calculated from the resulting cement weight and your water-cement ratio.
Concrete mix calculation formula
Concrete mix quantity calculation starts with the required wet concrete volume, then converts it into dry material volume. The dry volume is divided between cement, sand, and aggregate according to the selected mix ratio.
Step 1 - Wet Concrete Volume
The wet concrete volume is the final concrete volume required at site. In this calculator, the user enters this value directly in m³ or ft³.
Step 2 - Dry Volume
Dry volume accounts for voids between aggregates, bulking, compaction, and handling losses. For nominal concrete estimation, 1.54 is commonly used.
Step 3 - Total Mix Parts
The selected concrete ratio is split into cement, sand, and coarse aggregate parts. For example, 1:2:4 has 7 total parts.
Step 4 - Cement, Sand, and Aggregate Volume
Each material receives its share of the dry volume based on the selected ratio.
Cement Volume = Cement Part / Total Parts x Dry Volume
Sand Volume = Sand Part / Total Parts x Dry Volume
Aggregate Volume = Aggregate Part / Total Parts x Dry Volume
Step 5 - Cement Weight and Cement Bags
Cement volume is converted into weight using a standard cement density of 1440 kg/m³. The number of bags is then calculated using the selected cement bag weight.
Cement Weight = Cement Volume x 1440
Cement Bags = Cement Weight / Cement Bag Weight
Step 6 - Water Requirement
Water is estimated from cement weight and the selected water-cement ratio. Since 1 kg of water is approximately 1 liter, the water quantity is shown in liters.
Step 7 - Wastage Allowance
Wastage allowance is applied to the calculated material quantities to cover handling losses, small batching differences, spillage, and practical site variation.
Example concrete mix calculation
This example uses the active calculator inputs above and follows the same steps from the formula section — showing the default scenario if you haven't changed anything, or your own live inputs once you do.
Input Values Used
| Input | Value | Why it is used |
|---|---|---|
| Concrete volume | 1.00 m³ | Sets the total wet concrete volume to estimate |
| Mix ratio | 1:2:4 | Splits dry volume into cement, sand, and aggregate parts |
| Dry volume factor | 1.54 | Converts wet volume to dry material volume |
| Cement bag weight | 50 kg | Converts cement weight into bag count |
| Water-cement ratio | 0.50 | Sets water quantity from cement weight |
| Wastage allowance | 5% | Adds a buffer for handling and site losses |
Step 1 — Dry Volume
| Calculation | Substitution | Result |
|---|---|---|
| Dry Volume | 1.00 × 1.54 | 1.54 m³ |
Step 2 — Total Mix Parts
| Calculation | Substitution | Result |
|---|---|---|
| Total Parts | 1 + 2 + 4 | 7 |
Step 3 — Cement Volume, Weight & Bags
| Calculation | Substitution | Result |
|---|---|---|
| Cement Volume | 1 / 7 × 1.54 | 0.22 m³ |
| Cement Weight | 0.22 × 1440 | 316.80 kg |
| Cement Bags | 316.80 / 50 | 6.34 bags |
Step 4 — Sand & Aggregate Volume
| Calculation | Substitution | Result |
|---|---|---|
| Sand Volume | 2 / 7 × 1.54 | 0.44 m³ |
| Aggregate Volume | 4 / 7 × 1.54 | 0.88 m³ |
Step 5 — Water Requirement
| Calculation | Substitution | Result |
|---|---|---|
| Water | 316.80 × 0.50 | 158.4 liters |
Step 6 — With 5% Wastage
| Calculation | Substitution | Result |
|---|---|---|
| Cement Bags | 6.34 × (1 + 5 ÷ 100) | 6.65 bags |
| Sand | 0.44 × (1 + 5 ÷ 100) | 0.46 m³ |
| Aggregate | 0.88 × (1 + 5 ÷ 100) | 0.92 m³ |
| Water | 158.4 × (1 + 5 ÷ 100) | 166.3 liters |
Therefore, for 1.00 m³ of concrete using a 1:2:4 mix, you need 6.65 cement bags, 0.46 m³ of sand, and 0.92 m³ of aggregate.
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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.