EcoLedger
Carbon Footprint Calculator
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Calculate your Scope 1, 2 & 3 footprint in minutes.

A carbon calculator for finance and sustainability teams — pick your sector, fill in what you know, estimate what you don't, and see a credible Scope 1, 2 & 3 figure in minutes.

Coverage follows the GHG Protocol Corporate Standard, Scope 2 Guidance and Scope 3 Standard (Cat 1–15), with emission factors drawn from DESNZ 2024, IPCC AR5/AR6 and IEA grid data. The output is structured to align with ISSB IFRS S2 disclosure — a board-ready report with cited factors that you can export and hand to your auditor.

When you need an audit-grade number under ISO 14064-3 or ISAE 3410 assurance, EcoLedger handles the full GHG Protocol workflow.

Beyond the calculator
The full EcoLedger reporting suite, built for audit-grade ESG disclosure.
Carbon accounting is one piece. Explore modules for ISSB, CSRD, TCFD and UK SRS reporting.
ISSB IFRS S2 CSRD / ESRS E1 TCFD UK SRS 1&2
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Inputs auto-save in your browser
Sample data pre-loaded — feel free to explore the numbers, or to start with a blank canvas before entering your own.
Run as
Your organisation
Tell us a little about you — this calibrates defaults and benchmarks.
Used for tCO₂e per employee.
Used for tCO₂e per $m revenue.
Pick a sector above for tailored guidance.
Direct emissions you own Scope 1
Things you burn or release on-site or in your own vehicles.
0.00 tCO₂e
What is Scope 1? Direct emissions from sources your business owns or controls — the gas boiler at your office, the diesel in your fleet, refrigerant gases that leak from your A/C units. If you can put your hand on it, it's probably Scope 1.
Stationary combustion i [src ↗]
Activity
Quantity
Emission factor
tCO₂e
Natural gas heating, hot water, kitchen
kWh / year
That looks unusually high — check the unit (kWh, not therms).
kg CO₂e / kWh
0.00
Heating oil / kerosene off-grid sites
litres / year
kg CO₂e / litre
0.00
LPG / propane cylinders, boilers, kitchens
litres / year
kg CO₂e / litre
0.00
Generator / on-site diesel backup power, plant
litres / year
kg CO₂e / litre
0.00
Mobile combustion (your fleet) i [src ↗]
Fleet petrol
litres / year
kg CO₂e / litre
0.00
Fleet diesel
litres / year
kg CO₂e / litre
0.00
Aviation / marine fuel if you operate aircraft / vessels
litres / year
kg CO₂e / litre
0.00
Fugitive emissions (refrigerants) i [src ↗]
Refrigerant top-ups A/C servicing, leaks
kg topped up
GWP 2,088 (AR5)
0.00
Process emissions i
Process emissions e.g. clinker, livestock CH₄, chemical reactions
tCO₂e (already in tonnes)
— enter tCO₂e directly
0.00
Biogenic CO₂ (memo) i tCO₂e — reported separately, not in Scope 1 total (GHG Protocol Corp. Std. Ch.9).
Energy you buy Scope 2
Electricity, steam, heat or cooling delivered to your sites.
0.00 tCO₂e
What is Scope 2? Indirect emissions from energy you buy — usually grid electricity. The fuel was burnt at the power station, but the emissions are yours because you bought the electricity.
Location-based uses the grid average above.
Energy consumed [src ↗]
Activity
Quantity
Emission factor
tCO₂e
Purchased electricity all sites combined
kWh / year
That looks unusually high — check the unit (kWh, not MWh).
kg CO₂e / kWh
0.00
No evidence claimed. Under the GHG Protocol Scope 2 Guidance, market-based reductions require contractual instruments (RECs, REGOs, GoOs, PPAs) that are tracked, retired and not double-counted. Without evidence, your market-based and location-based numbers should be the same.
District heat / steam
kWh / year
kg CO₂e / kWh
0.00
District cooling
kWh / year
kg CO₂e / kWh
0.00
Your value chain Scope 3
Everything else — what you buy, how staff travel and commute, where your products end up.
0.00 tCO₂e
What is Scope 3? The 15 categories of indirect emissions across your value chain — from suppliers, business travel, employee commuting, waste, the products you sell. For most organisations Scope 3 is far bigger than Scope 1+2 combined. We've kept the most material categories below.
Cat 1 · Purchased goods & services i [src ↗]
Industry of your spend (sets a sensible factor):
Activity
Quantity
Emission factor
tCO₂e
Purchased goods & services non-capital procurement spend
$ / year
That looks unusually high relative to your stated revenue — check the figure.
kg CO₂e / $
0.00
Capital goods Cat 2 — equipment, fit-outs
$ / year
kg CO₂e / $
0.00
Cat 3 · Fuel- & energy-related activities i [src ↗]
Well-to-tank — fleet fuels upstream emissions of fuels you burnt in Scope 1 mobile
auto: ~21% of fleet S1
factor 0.21 × tank-to-wheel
0.00
Well-to-tank — stationary fuels upstream emissions of gas/oil/LPG burnt in Scope 1 stationary
auto: ~16% of stationary S1
factor 0.16 × stationary
0.00
T&D losses — electricity grid losses on the kWh you bought
auto: kWh × 0.0184
kg CO₂e / kWh
0.00
Cat 6 · Business travel [src ↗]
Flights — short-haul < 1500 km, economy
passenger.km
kg CO₂e / p.km
0.00
Flights — long-haul > 3700 km
passenger.km
kg CO₂e / p.km
0.00
Rail / Eurostar
passenger.km
kg CO₂e / p.km
0.00
Hotel nights
room-nights
kg CO₂e / night
0.00
Cat 7 · Employee commuting [src ↗]
Commuting (avg car) all staff combined per year
passenger.km
kg CO₂e / p.km
0.00
Commuting (rail / bus / tube)
passenger.km
kg CO₂e / p.km
0.00
Home-working day allowance Cat 7 — typical 1.7 kg / WFH day
WFH days / year
kg CO₂e / day
0.00
Cat 4 / 9 · Freight & logistics [src ↗]
Upstream freight (HGV) Cat 4 — inbound goods
tonne.km
kg CO₂e / t.km
0.00
Downstream freight Cat 9 — outbound to customer
tonne.km
kg CO₂e / t.km
0.00
Cat 5 · Waste & water [src ↗]
Waste to landfill
tonnes / year
kg CO₂e / tonne
0.00
Waste recycled
tonnes / year
kg CO₂e / tonne
0.00
Water supply & treatment
m³ / year
kg CO₂e / m³
0.00
Sector-specific Scope 3 i
Use of sold products (Cat 11) Energy use of products you sell over their lifetime
unit / year
kg CO₂e / unit
0.00
Estimated total footprint
0.00tCO₂e / year
Across Scope 1, 2 and 3 — directional, GHG-Protocol-aligned.
Scope 1 — direct0.000%
Scope 2 — purchased energy0.000%
Scope 3 — value chain0.000%
Carbon intensity
0.00
tCO₂e / $m revenue
0.00
tCO₂e / employee
$0
at internal carbon price of $80/tCO₂e
Sector benchmark tCO₂e / $m revenue
Peer average—
Your intensity—
Source: EcoLedger working estimate from CDP 2024 disclosed Scope 1+2+3 / revenue, sector-filtered (n≈30–80 per sector). Directional only.
This is a directional estimate. When you need an audit-ready number with verified factors, full Cat 1–15 coverage and ISSB / CSRD / TCFD reporting in one place, that's what EcoLedger is for.
See EcoLedger →
Factors: DESNZ 2024 v1.1 · IPCC AR5 GWP · GHG Protocol Corporate Standard (rev. 2004) + Scope 2 Guidance (2015) + Scope 3 Standard (2011)
Calculated: — · v2.1
GHG Protocol aligned
~5 minutes
Inputs stay in your browser
Method, sources & limitations
Approach. Totals are the sum of activity-data × emission-factor for every line, divided by 1,000 to convert kg → tCO₂e. Refrigerant emissions are kg × GWP / 1,000. Process emissions and biogenic CO₂ are entered directly in tCO₂e.

Standards aligned to. WRI/WBCSD GHG Protocol Corporate Accounting and Reporting Standard (Revised, 2004); WRI GHG Protocol Scope 2 Guidance (2015) covering location- and market-based methods; WRI Corporate Value Chain (Scope 3) Accounting and Reporting Standard (2011) covering Cat 1–15. GHG Protocol Scope 2 Guidance market-based criteria (Quality Criteria for Contractual Instruments, §7.5) are reflected in the evidence-type dropdown.

Emission factors. UK Government GHG Conversion Factors (DESNZ, 2024 v1.1 release, June 2024). Refrigerant GWPs from IPCC AR5 (2014) by default; AR6 (2021) optional. International grid factors: EEA 2023 (EU), EPA eGRID 2024 (US), IEA 2024 (China, Norway), CEA 2023 (India), MCTI 2024 (Brazil). Spend-based factors derive from EXIOBASE 3.8 / DEFRA Indirect Emissions 2024 — these vary 5–10× across categories and are the largest source of estimation error.

Sector benchmarks. EcoLedger working estimates from CDP 2024 disclosed Scope 1+2+3 / revenue, sector-filtered (n≈30–80 per sector). Designed as a directional sanity-check, not a peer-reviewed comparison. Sector definitions follow ICB; comparability across companies is limited by differing organisational boundaries, Scope 3 completeness and reporting maturity.

What this tool is not. Free directional calculator only — not assurance-grade. Does not replace verification under ISO 14064-3, AA1000AS or ISAE 3410. Does not constitute regulatory disclosure under ISSB IFRS S2, CSRD/ESRS E1, UK SRS 1&2 or the SEC climate rule. Sanity warnings are heuristics, not validation.

Privacy. Calculations run locally in your browser. Activity inputs are saved to your browser's local storage so you can come back to them — they are never transmitted to a server. When you download your report, we ask for your name, email and role; this contact information is the only data sent to EcoLedger. Use the Reset button to clear all stored data.