# How do I calculate the carbon footprint of wall putty per kg?

Canonical: https://senseible.earth/answers/wall-putty-carbon-footprint-per-kg

In cement-based putty, white cement usually drives most of the footprint: multiply the cement per kg by the cement maker's figure. Add calcite, polymer and bags, then blending and packing electricity divided by kg packed.

## Materials

- White cement by weight.
- Calcite or dolomite powder.
- Redispersible polymer powder and additives.

## Process

- Dry blending in ribbon or plough mixers.
- Packing in bags.
- Dust collection.

## Per kg

Report per kg by product. Cement content drives most of the figure, so give the white cement share.

## Worked example: wall putty unit per kg (one month)

- Electricity: 20,000 kWh x 0.710 = 14,200 kg CO2
- Putty packed (kg): 2,000,000
- Plant total: 14,200 / 2,000,000 = 0.00710 kg CO2 per kg
- Add white cement and polymer for the full figure

Inputs are illustrative; use your own bills and production records.

## What Senseible does here

Senseible reads the plant's electricity bills (CEA grid factor 0.710 kg CO2 per kWh, CO2 Baseline Database version 21.0) and fuel invoices (IPCC 2006 defaults) into a fingerprinted Scope 1 and 2 record, the plant-level input to a per-unit figure. Bought-in materials go to the supplier evidence trail; product reports are self-declared drafts.

- [Product carbon footprint calculator](https://senseible.earth/calculators/product-carbon-footprint)
- [Paint footprint](https://senseible.earth/answers/paint-carbon-footprint-per-litre)
- [Ready mix concrete footprint](https://senseible.earth/answers/ready-mix-concrete-carbon-footprint-per-cubic-metre)
- [Cement industry](https://senseible.earth/industries/cement)

Sources: [GHG Protocol Product Standard](https://ghgprotocol.org/standards), [ISO 14067:2018, Carbon footprint of products (iso.org)](https://www.iso.org), [IPCC 2006 Guidelines, Volume 2 Energy (fuel defaults)](https://www.ipcc-nggip.iges.or.jp/public/2006gl/vol2.html), [CEA CO2 Baseline Database, version 21.0](https://cea.nic.in/cdm-co2-baseline-database/?lang=en)

Last reviewed 2026-10-20.