GreenCalculus

Look up greenhouse-gas emission factors and run standards-based carbon calculations (activity-based, embodied EN 15978, PCAF financed emissions) — every…

CommunityOnlineNo sign-inGlobalFreeRead-only

What it can do

  • Lookup Factor: Look up a single greenhouse-gas emission factor by its canonical key and get the value with full provenance (source id, exact source cell, data version). Use search_factors first if you
  • Search Factors: Find emission-factor keys by section, key prefix, or free text. Returns matching keys, names, and sections (values are redacted here — call lookup_factor for the value).
  • Calculate Activity: Turn activity data into greenhouse-gas emissions: emissions = activity × factor. Give an amount + unit and a factor key; the unit engine converts to the factor basis (MWh→kWh, tonn

What data it sees

Do you need an account

No: the server works without sign-in

Look up greenhouse-gas emission factors and run standards-based carbon calculations (activity-based, embodied EN 15978, PCAF financed emissions) — every result returns with its exact source cell and data version, so your agent hands back sourced, citable numbers instead of a guess. 13,000+ factors across 50+ categories (grid, fuels, freight, refrigerants, AFOLU, CBAM, construction materials, spend-based EEIO, digital). Free tier, no card.

How to connect

How to connect GreenCalculus to Claude

The server address to paste into Claude settings:

https://api--greencalculus.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect GreenCalculus to ChatGPT

The server address to paste into ChatGPT settings:

https://api--greencalculus.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect GreenCalculus to Cursor

The server address to paste into Cursor settings:

https://api--greencalculus.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (10)

Raw names from tools/list. Only developers need these.

lookup_factorLook up a single greenhouse-gas emission factor by its canonical key and get the value with full provenance (source id, exact source cell, data version). Use search_factors first if you do not know the key.
search_factorsFind emission-factor keys by section, key prefix, or free text. Returns matching keys, names, and sections (values are redacted here — call lookup_factor for the value).
calculate_activityTurn activity data into greenhouse-gas emissions: emissions = activity × factor. Give an amount + unit and a factor key; the unit engine converts to the factor basis (MWh→kWh, tonne→kg, gallon→litre, mile→km) and returns the emissions with the working, the GHG Protocol scope, and the source. Use search_factors / lookup_factor to find the factor key.
calculate_embodiedWhole-life embodied carbon for materials, per EN 15978. Give a material key + quantity (+ optional boundary A1-A3 / A1-A4 / A1-A5 / A1-C); it assembles the declared lifecycle modules (A1-A3, B, C1-C4, D) into stages, totals the boundary, reports module D separately, and flags any missing stage as not-assessed (never zero). Find material keys via search_factors (section "materials").
calculate_pcafCompute PCAF Part A financed emissions for a portfolio. Returns each holding's attribution factor and financed emissions, the portfolio total, the outstanding-weighted data-quality score, and the audit trail (formula + PCAF source).
calculate_electricityGHG Protocol Scope 2 for purchased electricity, both methods. Always returns location-based (grid-average) emissions; also returns market-based when you supply a contractual supplier_factor (e.g. a green tariff / REC = 0) or a market_factor_key (residual mix). Find grid keys via search_factors (section "grid").
calculate_freightFreight & logistics emissions (Scope 3 Cat 4 & 9), GLEC tonne-km method: emissions = tonnes × km × factor. Find mode factors via search_factors (section "freight" or "freight_detailed"), e.g. freight.road_hgv.tonne_km.
calculate_spendSpend-based (EEIO) Scope 3 screening: emissions = spend × economic-intensity factor. Spend must be in the factor's own currency/year (no FX). Find sector factors via search_factors (section "spend_based"), e.g. spend_based.us.naics6.541511.custom_computer_programming.
calculate_business_travelBusiness travel emissions (Scope 3 Cat 6), distance method: emissions = km × passengers × factor. Air factors come in with_rf / without_rf (radiative forcing) variants. Find factors via search_factors (section "business_travel").
resolve_factorFind the best emission-factor key(s) for a plain-language description — the hardest step is picking the right key out of ~13,000. Returns ranked candidates with a confidence score; feed the chosen key to a calculate_* tool or lookup_factor. Prefer this over guessing a key.