Use these typical values to test calculations, then replace with supplier data.
| Scenario | Volume (m³) | Binder (kg/m³) | SCM (%) | Distance (km) | Grid (kgCO2e/kWh) | Wastage (%) |
|---|---|---|---|---|---|---|
| General structural mix | 10 | 350 | 25 | 50 | 0.55 | 3 |
| Lower-carbon blend | 10 | 320 | 45 | 50 | 0.55 | 3 |
| Long-haul supply | 10 | 350 | 25 | 180 | 0.55 | 3 |
Binder split
- Cement (kg/m³) = Binder × (1 − SCM%)
- SCM (kg/m³) = Binder × SCM%
Material emissions
- Emissions per m³ = Σ(Material mass × Material factor)
- Material factor units: kgCO2e per kg material
Transport emissions
- Total mass (ton/m³) = Total mass (kg/m³) ÷ 1000
- Transport per m³ = Mass × Distance × Transport factor
Plant energy
- Plant per m³ = Plant electricity × Grid factor
Project wastage
- Applied factor = 1 + Wastage%
- Total per m³ = (Materials + Transport + Plant) × factor
- Total project = Total per m³ × Volume
- Enter concrete volume and binder content per cubic meter.
- Set SCM replacement to match the mix design.
- Replace default factors with supplier or EPD values.
- Confirm aggregate, water, and admixture quantities per cubic meter.
- Add average transport distance and an appropriate transport factor.
- Provide plant electricity and the local grid factor.
- Include wastage to reflect over-ordering and losses.
- Click Calculate to view totals and breakdowns.
- Use CSV or PDF downloads for reporting.
Concrete embodied carbon drivers in construction
Concrete carbon is dominated by binder chemistry, not by volume alone. Cement production releases process emissions from limestone calcination and fuel emissions from kiln heat. This calculator separates cement and SCM shares so teams can see how replacement strategies change the footprint per cubic meter.
Using supplier factors and project assumptions
Default factors are placeholders to help you start quickly. For professional reporting, replace them with verified environmental product declarations, regional datasets, or supplier statements. Keep units consistent: kgCO2e per kg for materials, kgCO2e per ton-km for transport, and kgCO2e per kWh for electricity.
Transport and batching energy contributions
Transport can be small for local aggregates or significant for long-haul supply chains. This tool converts the supplied mass to tons per cubic meter and applies an average distance. Plant electricity covers mixing and yard operations, scaled by a grid factor, allowing sensitivity checks for cleaner power scenarios.
Interpreting results for mix optimization
Compare emissions per cubic meter across options, then review the component shares. If cement dominates, increase SCM replacement, reduce binder content while meeting strength and durability, or source lower-factor cement. If transport dominates, consider closer sources, consolidated deliveries, or alternate modes.
Quality control, wastage, and documentation
Wastage raises totals by applying a project factor for over-ordering, losses, and returned concrete. Track actual placed volume and delivery tickets to refine the percentage. Export the CSV for audit trails and the PDF for submittals. Document the chosen factors, boundaries, and assumptions alongside results.
Example data
Sample dataset for a quick validation run.
| Field | Value | Unit |
|---|---|---|
| Concrete volume | 10 | m³ |
| Binder content | 350 | kg/m³ |
| SCM replacement | 25 | % |
| Cement factor | 0.85 | kgCO2e/kg |
| SCM factor | 0.10 | kgCO2e/kg |
| Transport distance | 50 | km |
| Plant electricity | 4.0 | kWh/m³ |
| Wastage | 3 | % |
1) What does this calculator estimate?
It estimates embodied emissions from concrete materials, average transport, and batching electricity, with an optional wastage factor. It does not include rebar, formwork, pumps, onsite fuel, or end-of-life scenarios.
2) How should I choose emission factors?
Use supplier EPDs where available. Otherwise select reputable regional datasets and state the source in reports. Keep factors in kgCO2e per kg material, and verify boundaries and allocation methods.
3) Why does cement dominate the footprint?
Cement manufacturing involves high-temperature kilns and process CO2 from limestone conversion. Even small cement reductions can produce large savings, especially when strength targets allow lower binder content.
4) What SCM replacement levels are reasonable?
It depends on performance, curing time, and durability exposure. Many structural mixes use 15–35% SCM, while higher replacements may be feasible with testing, mix design expertise, and appropriate curing practices.
5) How is transport calculated?
The tool applies an average one-way distance to the supplied mass per cubic meter, converted to tons. For complex logistics, run separate scenarios for cement, aggregates, and admixtures and compare the sensitivity.
6) How should I set wastage?
Start with a small percentage based on site experience, then refine using delivery tickets and placed quantities. Better planning, accurate takeoffs, and disciplined ordering can reduce wastage and avoid unnecessary emissions.
7) Can I use the PDF in client submittals?
Yes, but include assumptions, factor sources, and scope boundaries. For formal compliance, align reporting with your project framework and local requirements, and verify values with the concrete supplier or LCA specialist.