CarboMeter

Track your browsing carbon footprint, locally.

Every tab has a carbon cost. CarboMeter shows you exactly what it is. The internet consumes roughly 4% of global electricity — more than the entire aviation industry. Every page load, every video stream, every background request burns energy and emits CO₂. But until now, that cost has been invisible. CarboMeter makes it visible. What it does ------------------------------------------------------- CarboMeter silently measures the data transferred by every website you visit and converts it into grams of CO₂ equivalent — in real time, right on your toolbar badge. Open the popup and you'll see: - Your total carbon footprint from browsing, all time - Your emissions today, this week, and this month - A 30-day chart so you can spot trends at a glance - A per-domain breakdown showing your top emitters — the sites that cost the most - No setup. No accounts. No permissions beyond what's strictly needed. Just install and go. Grounded in science ------------------------------------------------------- CarboMeter uses the Sustainable Web Design Model v4 — the same methodology trusted by web sustainability researchers and organizations worldwide. - 0.300 kWh per GB of data transferred - 494 gCO₂e per kWh (Ember global average carbon intensity) - Emissions are always derived on-the-fly from raw bytes — nothing is pre-cooked or rounded early The formula is simple enough to verify yourself, and the constants are documented in the source code. Built for privacy ------------------------------------------------------- CarboMeter works entirely on your device. It never phones home, never sends your browsing data anywhere, and has no backend whatsoever. Everything stays in your browser's local storage. - No analytics - No telemetry - No third-party services Lightweight by design ------------------------------------------------------- CarboMeter won't slow your browser down. It has no visible performance impact. Available in 22 languages ------------------------------------------------------- English, French, Spanish, German, Italian, Portuguese, Dutch, Polish, Japanese, Simplified Chinese, Arabic, Hebrew, Persian, Russian, Vietnamese, Indonesian, Czech, Korean, Ukrainian, Hungarian, Swedish, and Hindi. Full right-to-left support for Arabic, Hebrew, and Persian. What the numbers mean ------------------------------------------------------- A typical webpage transfers about 2–4 MB of data, which works out to roughly 0.3–0.6 g of CO₂. That sounds tiny — until you multiply it by 5 billion internet users making dozens of requests a day. Streaming HD video? A single hour can emit 36 g or more. A heavy news homepage with autoplaying ads? Often worse than you'd expect. CarboMeter doesn't preach. It just shows you the numbers and lets you decide what to do with them. Who it's for ------------------------------------------------------- - Sustainability-minded users who want to understand the environmental cost of their digital habits - Web developers who want to see the real-world impact of the sites they build - Researchers and journalists looking for a reliable, methodology-backed measurement tool - Anyone curious about where their data goes and what it costs the planet Start measuring. Start knowing.