Not a score. Not a guilt trip. A credible, sourced, personalised picture of where your estimated emissions come from — and what to do about them.
Most personal carbon tools are built by people with good intentions and no methodology background. The emission factors are vague, the assumptions are buried, and the numbers rarely hold up to scrutiny.
Decarb started from the other direction. The methodology came first — built on the same emission factor standards used in professional environmental consulting. The product followed. That order matters.
The goal isn’t to make you feel good about a number. It’s to give you a number you can actually trust — and a plan worth acting on.
Decarb uses the same data sources as institutional GHG accounting. Not estimates of estimates. Not proprietary black-box coefficients. The full methodology is documented publicly at decarb.co/methodology.
The calculator covers six emission categories: home energy, transport, flights, food and diet, consumption, and financed emissions. US and EU markets are both supported, with country-level grid factors and regional defaults throughout.
Estimates, clearly labelled. We never present modelled figures as verified data. Every number comes with an assumption log.
Sources named inline. IPCC, EPA, eGRID, IEA, Poore & Nemecek — attributed in the methodology, not hidden in footnotes.
Version-controlled factors. Emission factors update as better data becomes available. Version numbers are tracked.
No carbon neutral claims. We will not call anything carbon neutral unless it has been independently verified.
Electricity factors from eGRID 2023 (0.37 kg CO₂e/kWh US average). Fuel oil and gas from EPA Emissions Factors Hub 2024. Regional subgrid factors available.
Road transport from EPA vehicle emission factors. Flight emissions from ICAO Carbon Emissions Calculator methodology, including a radiative forcing multiplier.
Lifecycle emission factors from Poore & Nemecek (2018), the most comprehensive food systems dataset available. Covers 40 food products from farm to retail.
Consumption-based emission factors from Exiobase, a multi-regional input-output database covering goods and services across 44 countries.
Bank deposits and investment portfolios calculated using PCAF-aligned emission intensity factors. US defaults use Federal Reserve SCF 2022 averages.
EU users receive country-level grid factors from IEA and EEA data. EUR-denominated finance defaults and regional transport factors throughout.
Decarb is being built in phases. Each phase adds a layer of value without compromising what’s already there.
A credible 15-question calculator producing a structured, transparent, personalised reduction report.
A native webapp replaces Typeform. User accounts introduced. The focus shifts from a one-time calculation to a continuous record.
Decarb Capital connects users to the investments and services that actually move their footprint number — not just measure it.
Free. 3 minutes. Sourced emission factors. No account required.