Carbonledger turns invoices, meter reads, and supplier data into a double-entry carbon ledger — Scope 1, 2, and 3 — with the emission factor, the calculation, and the evidence behind every line. The footprint your CFO signs and your auditor can't unravel.
Built for the teams who have to sign the disclosure
Most carbon tools hand you a dashboard and a total you have to take on faith. Carbonledger hands you a ledger — every figure reconciled, sourced, and ready for the only question that matters: 'where did this come from?'
A double-entry record where every emission posts against a source document — an invoice, a utility bill, a fuel receipt. Drill from the headline tonnage down to the single line that produced it. No black boxes, no 'trust the model.'
Direct fuel, purchased energy, and the long tail of supply-chain emissions — measured on a single chart of accounts instead of three disconnected spreadsheets that never tie out.
Every factor library — DEFRA, EPA, ecoinvent, IEA grid mixes — is dated and pinned. When a factor changes, prior periods stay intact and the restatement is logged line by line.
Send a request, collect primary data, and fall back to spend-based estimates only where you must — with the method flagged on every Scope 3 line so nothing hides behind an average.
Generate CSRD, CDP, and GHG Protocol reports straight from the ledger, each figure footnoted to the calculation and source behind it.
What a real ledger changes
There is no hidden step between the number you report and the receipt that backs it. This is the drill-down an auditor follows — and now does themselves.
84,210 tCO2e across Scopes 1–3 for FY26. One number, signed — with every component reconciled beneath it.
Open 'Purchased electricity' and see every facility's posting, the grid mix applied, and the share still on location-based versus market-based method.
A single meter read: 84,902 kWh, the IEA factor and version that priced it, the tCO2e it produced, and who entered it when.
The meter read itself, attached. No re-keying, no 'we'll send that over' — the document that justifies the line lives on the line.
Anyone can publish a number. Carbonledger is built for the follow-up — the auditor, the regulator, the board member who asks how you know.
Every edit, factor change, and restatement is timestamped and attributed. Reconstruct any reported figure exactly as it stood on the day you filed.
Each line shows whether it used primary, supplier-specific, or spend-based data — so reviewers see the quality, not just the total.
Give your external assurer read-access to source documents and calculations directly, ending the annual scramble of forwarded email attachments.
Set a science-based target, baseline it once, and watch actuals post against the trajectory each period — variances explained, not assumed.
“Our auditor used to spend three weeks chasing the calculations behind our footprint. This year they pulled the evidence themselves and signed in four days. That alone paid for it.”
“Scope 3 was a guess we were embarrassed to publish. Carbonledger let us collect real supplier data and show exactly where we still estimate. Our disclosure finally tells the truth.”
“When DEFRA updated its factors, every prior year restated automatically with a full log. I didn't have to rebuild a single spreadsheet, and I could explain the change to the board in one screen.”
Every plan includes the full audit trail and factor versioning. You scale on entities, scopes, and supplier reach — never on whether your numbers are defensible.
Measure your first footprint, properly.
For companies that have to report and assure.
For complex groups and regulated filings.
A dashboard shows you a total. Carbonledger shows you the total and the road to it — every tonne posted against a source document, with the emission factor and calculation visible on the line. When someone asks how you arrived at a figure, you click into it instead of rebuilding it.
We align with the GHG Protocol across Scopes 1, 2, and 3, and export to CSRD and CDP formats. Factor libraries include DEFRA, EPA, ecoinvent, and IEA grid mixes — all dated, versioned, and pinned per reporting period.
Yes. You collect primary data where you can through built-in supplier requests, and fall back to spend-based or activity-based estimates everywhere else. Crucially, every Scope 3 line is flagged with the method used, so your disclosure shows data quality honestly rather than hiding the gaps.
Prior periods stay exactly as filed. The new factor applies going forward, and any restatement of past figures is logged with the old value, the new value, and the date — so your audit trail explains the movement instead of silently overwriting it.
That's the design goal. Because the ledger reconciles to source documents and your external assurer can review evidence directly, the annual assurance cycle stops being a months-long email hunt. Most teams cut their close-to-signed-footprint time to single-digit days.
See your own data turned into a defensible carbon ledger in a 30-minute walkthrough — no slideware, just your numbers traced to their source.