Authoritative Data
We utilize recognized emissions coefficient factors, delivering high scientific accuracy and credibility.
Bespoke integrations bringing carbon accounting functionality to your website or app
Our suite of carbon accounting tools are available via custom integration packages.
Why utilize our tooling for your emissions analysis efforts?
Developer Support
The experience our carbon accounting and product development teams bring to their engagements allow us to catalyze long term partnerships.
Flexible Framework
Our approach enables seamless and lightweight integration into a wide variety of web-based carbon footprint calculators and applications.
Continuous Improvement
Core to our approach is the maintenance of curiosity and ensuring our products and services don't stand still as carbon accounting methodologies advance.
Example Integration: Aviation Emissions Tool
Calculate flight emissions with our easily embeddable widget.
Our flight calculator utilizes UK Government (DESNZ) emissions coefficients across a database of more than 7,900 airports worldwide, subject to great-circle distance, routing uplift, haul length, cabin class, and radiative forcing to provide a detailed and accurate per-passenger carbon account of travel.
Choose a departure and destination airport
Emissions are calculated from the great-circle distance between the two airports using UK Government (DESNZ) conversion factors — no region or aircraft selection required.
Take Climate Action in a Few Clicks after analyzing your emissions.
We make climate action simple and accessible. Whether you’re looking to invest in climate solutions to balance your carbon footprint or integrate programmatic offsetting into your software, Carbonmark empowers you to do so in real time and at any scale, from 0.001 to thousands of tonnes of CO₂e.
Carbonmark is a compliance-grade solution that offers real climate accountability and regulatory readiness, with the depth required for thorough due diligence. Ideal for ESG reporting and investor assurance.
Key facts
- Carbonmark offers bespoke integrations that bring carbon accounting functionality to partner websites and apps, delivered via custom integration packages.
- Carbonmark's carbon accounting tools use recognized emissions coefficient factors for high scientific accuracy and credibility.
- Example integration: an embeddable aviation emissions calculator, live on this page and at carbonmark.com/tools/flight-emissions, which estimates per-passenger CO2e for any route between two of 7,900+ airports worldwide.
- The flight calculator uses emissions factors from the Greenhouse gas reporting: conversion factors 2026 (UK Department for Energy Security and Net Zero (DESNZ/DEFRA), published 11 June 2026), includes radiative forcing by default, and applies DEFRA's 8% great-circle distance uplift for indirect routing, holding patterns and taxiing.
- The flight calculator requires only a departure airport, a destination airport, cabin class and trip type — the DEFRA haul band (domestic, short-haul or long-haul) is derived from the distance between the two airports and whether they are in the same country.
- The framework enables seamless, lightweight integration into a wide variety of web-based carbon footprint calculators and applications, with developer support from Carbonmark's carbon accounting and product development teams.
- After analyzing emissions, users can offset in real time at any scale, from 0.001 to thousands of tonnes of CO2e, through the Carbonmark marketplace (app.carbonmark.com) or the Carbonmark API (carbonmark.com/api-and-integrations).
- Carbonmark is a compliance-grade solution with the depth required for thorough due diligence, suited to ESG reporting and investor assurance.