Free forever — no sign-up, no report to buy. Just carbon, made to make sense.
Runs entirely in your browser. Installs to your phone and works offline.
A tonne of CO₂ is hard to picture
"Two-point-five tonnes of CO₂e" means very little to most people — including plenty of people making decisions about buildings. TreeMonkey fixes that. It turns any amount of carbon into things you can actually picture: a stand of trees absorbing for a year, miles in a petrol car, return flights, or the annual energy of a typical UK home. It's the fun end of the Monkey toolkit — the one that gets shared — and it quietly does the serious job of building carbon literacy.
Turn your project into numbers people feel
The "My project" tab is where it earns its keep. Slide a floor area and see a new build's embodied carbon; size a PV array and see its yearly grid offset; set a retrofit's gas saving or a home's space-heat demand and watch the trees add up. It's a fast, honest way to frame a project for a planning submission, a client conversation or a design review — and when you need the real, defensible figure, our team turns it into a proper whole-life carbon and energy statement.
Compare two options side by side
The Compare tab puts two scenarios head to head — a gas boiler against a heat pump, a car year against a flight, one design against another — and shows the difference as a percentage and as trees saved every year. It's the clearest one-screen way to make the low-carbon case.
Built to be shared
Every result becomes a designed card you can send anywhere: straight into WhatsApp or socials from your phone, as a downloadable image, or as a link that reopens the exact number. Each card even carries a QR code back to the live tool — so it works on a poster, a slide or a school display, not just a screen. It's free reach that puts Energycount's name next to a genuinely useful thing.
How it works
- Pick a starting point — a tonnage, an everyday activity (miles, flights, kWh), or your own project.
- See it in real terms — trees for a year, car miles, flights, homes and more, each with its source.
- Compare two options — put two scenarios side by side and read off the saving.
- Share it — a designed card with a scannable QR link, straight to WhatsApp, socials or a download.
Honest about the numbers
TreeMonkey shows illustrative equivalents — it is not an offset or carbon-credit scheme, and it isn't a compliance calculation. Figures come from published UK sources (SAP 10.2 emission factors, DESNZ/DEFRA conversion factors, National Grid ESO grid intensity, Forest Research and LETI/RIBA benchmarks), each named on the result. And it keeps the message straight: trees are the picture, but the real win is not emitting the carbon in the first place.
Who it's for
Homeowners and self-builders weighing up solar or a heat pump; architects and developers framing a project's carbon for planning; and anyone who's ever wondered what a tonne of CO₂ really means. Need those numbers turned into a stamped report? We're happy to help.
Quick answers
Common carbon questions, answered — each with the tool one tap away:
- How many trees does it take to offset a car?
- How much CO₂ does a car produce per mile?
- How much CO₂ is a return flight?
- How much CO₂ does a tree absorb?
- What is a UK household’s carbon footprint?
- What is the embodied carbon of a new house?
- Heat pump vs gas boiler: how much carbon do you save?
- How much CO₂ is a kWh of electricity?
Frequently asked questions
What does TreeMonkey actually do?
It translates carbon into things you can picture. Put in any amount of CO₂ — or an everyday activity, or your own project — and it shows the equivalent in trees absorbing for a year, petrol-car miles, return flights, UK homes powered and more. Every figure carries its source.
Is it accurate — where do the numbers come from?
They're illustrative equivalents from published UK sources — DESNZ/DEFRA conversion factors, SAP 10.2 emission factors, National Grid ESO grid intensity, Forest Research on tree absorption, and LETI/RIBA embodied-carbon benchmarks. Each result card names its source and year. It's a carbon-literacy tool, not a compliance calculation — for the real, stamped numbers we do whole-life carbon and energy statements.
Can it show my own project?
Yes — the “My project” tab turns a floor area into a new home's embodied carbon, a kWp figure into a solar array's yearly offset, a retrofit's gas saving into carbon avoided, and a space-heat demand into heating carbon — each in trees. The Compare tab puts two scenarios side by side, like a gas boiler against a heat pump.
Is TreeMonkey free?
Completely free, forever — no sign-up, no paywall, no report to buy. It's here to make carbon make sense. If you need those figures turned into a proper carbon or energy statement for planning or Building Control, that's what our team does.
How do I share a result?
Every result has a Share button. On a phone it opens your share sheet straight into WhatsApp, Instagram or Messages with a designed card attached; on desktop you get a downloadable image, a WhatsApp-ready text, or a link that reopens the exact result. The share card even carries a QR code back to the live number — handy for posters, slides and school projects.
Does it work offline / can I install it?
Yes — TreeMonkey installs to your home screen like an app and runs fully offline once loaded. It's a lightweight single page, so it's quick even on a phone on site.
Why trees — isn’t offsetting the wrong message?
Trees are the picture, not the plan. TreeMonkey is clear throughout that the real win is not emitting the carbon in the first place — reduce first, offset last. The tree count is there to make a tonne of CO₂ feel real, and to point people towards the energy hierarchy and lower-carbon choices.