Try the core calculators
No card, no time limit. Useful for first-pass estimates and seeing whether the workflow fits.
Run practical carbon calculations for free. Upgrade when the work needs saved assumptions, branded reports, share links, embeds, stock workflows or buyer-ready basket views.
No card needed·Not sure where to start? Use Project Intake.
Tools and outputs
Free gives people a real way to test TCW. Pro is for the moment the work needs saving, exporting, sharing, embedding or turning into stock and basket outputs.
No card, no time limit. Useful for first-pass estimates and seeing whether the workflow fits.
All calculators, saved work, branded reports, share links, embeds, analytics, Stock and Basket Builder.
Start Pro →Use Pro yourself, or ask for help configuring embeds, reports, SharePoint pages, stock workflows or client website installs.
Ask about setup →Runs the full biomass → biochar → carbon → CO₂e chain. Tweak yield, moisture, permanence discount and process emissions and the numbers update instantly. Includes sanity-check ratios so you can spot if something's off before you share it.
Open Biochar Calculator →Scope 1, 2 and 3 for your organisation, built around BSI PAS 2060. Breaks down emissions by source and gives you a straight offset cost estimate at Gold Standard pricing. Useful for ESOS reports and CarbonZero assessments.
Open Footprint Analyser →Plug in household count, credit price and project life and you get annual credit volumes, total revenue and a simple ROI. Useful for sense-checking a project before you spend money on validation, or putting numbers together for a funder.
Open in Pro →Enter system capacity, peak sun hours and the local grid emission factor and get annual MWh generation, tCO₂e credits and lifetime revenue. Presets for West Africa, East Africa, South Asia, SE Asia and Latin America - the regions where most Gold Standard solar projects are developed.
Open in Pro →Estimate credits from afforestation, reforestation and revegetation projects under Verra VM0047 v1.1 - the new ICVCM-approved standard. Set hectares, forest type, permanence buffer and leakage deduction and see net annual credits with each deduction broken out line by line.
Open in Pro →The only tool of its kind. Choose project type and standard, enter your annual credit volume and price, and get an itemised breakdown of validation costs, annual verification fees, registry charges, net year-1 revenue and break-even timeline. Saves hours of VVB quote-gathering in early project planning.
Open in Pro →Pro turns the calculators into a working delivery layer: save assumptions, export branded outputs, publish embeds, maintain stock and build buyer baskets without rebuilding the same spreadsheet every time.
Publish a portfolio map with clickable projects, regional focus controls and client-safe display options.
Track lots, prices, LoAs, CCP tags and SDGs, then slice buyer baskets into shareable views.
Send branded reports, assumptions and result links after calls without cleaning up a workbook.
Add calculators, counters and market widgets to your own site and see which tools are being used.
Try it now
Adjust the live calculators below. Create a free account to keep working in the app, then move to Pro when you need saved work, exports, share links or the full tool suite.
A data-driven personal footprint calculator covering 8 lifestyle categories - home energy, flights, car, food, shopping, digital, activity and more. Get a score, track your progress over time, and see exactly what would make the biggest difference.
No black boxes
Every emission factor has a source. Every formula is documented. Change any input and you see the effect immediately - which matters when someone asks you to justify a figure.
Learn and apply
The Learn section explains registries, verification, pricing, project design and embeds in plain English. It is there for developers, consultants and teams who want clearer context before they start modelling.
Start with a guide, understand the trade-offs, then move into the calculator, embed or intake flow that fits what you are trying to do.
Open the Learn hub →Outputs people can trust
Each calculator is designed to show the assumptions, emission factors and deductions behind the result so a developer can review the logic before using it in a proposal or feasibility note.
Try a calculator →Pro workflows turn calculator results into cleaner client-facing outputs: branded exports, saved assumptions and shareable links that are easier to send to a funder, colleague or client.
See Pro features →Pro keeps commercial work close to the tools: embedded lead capture, stock records, basket views and cleaner proposal links for carbon teams.
Explore embeddable tools →Pricing
Use TCW free for practical first-pass calculators. Upgrade to Pro when the work needs to be saved, exported, shared, embedded or turned into a buyer-facing stock and basket workflow.
Project, business, finance and commercial tools in one account.
Turn results into something you can send after a call.
Configure calculators and widgets without building them yourself.
Keep exports and embeds closer to your own client workflow.
Biochar, footprint, CO₂e converter, water project, methodology selector and personal score.
Feasibility, cookstove, solar, borehole, forestry, verification costs, pension climate and net zero.
Maintain credit lots, slice buyer baskets, create share views and attach enquiries to the handoff.
Branded PDFs, CSV-ready outputs, share links, embeddable tools, project maps, widgets and analytics.
How we compare
A spreadsheet is fine for a private scratch model. TCW is for the point where the same calculation needs to be reused, shared, exported, embedded or tied to stock, basket and client-facing workflows without rebuilding the model each time.
| Feature | Carbon Workbench | Spreadsheet | Traditional GHG software |
|---|---|---|---|
| Carbon project calculator library | Build yourself | Usually corporate footprint focused | |
| Saved assumptions and repeatable outputs | Easy to overwrite | ||
| Consistent public and Pro user journey | Manual handoff | Usually gated from the start | |
| Branded PDF exports and CSV-ready outputs | Manual formatting | Often limited or expensive | |
| Shareable calculation links | Send a file | Account access often needed | |
| Embeddable calculators and widgets | - | Rare | |
| Methodology and market context | Separate notes | Variable | |
| Stock baskets and proposal links | Manual | - | |
| Client website and SharePoint use | Not practical | Custom project | |
| Setup time | Minutes | Hours or days | Weeks |
| Starting price | £0 | £0 + upkeep | Often £500+/mo |
FAQ
Answered honestly.
Calculations reference published sources such as IPCC AR6, UK DESNZ 2024 and methodology guidance from recognised carbon standards where relevant. The biochar workflow also reflects Puro.earth and Gold Standard permanence requirements. These are estimation tools - for formal credit issuance you'll still need independent verification.
The Carbon Workbench uses Gold Standard aligned methodology and is a strong starting point for project planning and feasibility. For formal submissions, you'll need a registered auditor to verify final numbers - but our tools will get you to the right ballpark quickly.
The free tier includes core calculators and guidance tools so you can test the workflow without a card. Upgrade to Pro for the full calculator suite, saved calculations, branded PDF and CSV-ready outputs, share links, embeddable tools, branding controls and the Stock Desk workflow.
Yes - cancel any time from your account. No long-term commitment. You keep Pro access until the end of your billing period.
Yes - start with Pro for the full tool suite, branded exports, share links and embeddable calculators. Optional setup support is there if you want help configuring embeds, stock workflows, proposal links, SharePoint, client websites or team onboarding.
Use the free Methodology Selector tool - pick your project type, scale, region and priority (credit quality vs volume vs speed) and it returns ranked recommendations with a plain-English explanation of why each standard suits your project. It covers cookstoves, water, biochar, solar, forestry/ARR, REDD+, agricultural land management, methane capture and blue carbon.
Yes - Pro users can generate a shareable link from any calculator. The link opens a clean read-only project card showing your key results and inputs, without requiring the recipient to have an account. Useful for sharing feasibility estimates with funders or project partners before a meeting.
We update emission factors annually in line with UK DESNZ guidance and IPCC updates. Pro users are notified when factors change so you can rerun affected calculations.
No card, no commitment. If it's useful, great. If you need more, Pro is £49/mo.
The Carbon Workbench - Explore the guides, then move into the right tool.