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CO₂e
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BETTER CHOICES, MADE VISIBLE
See the impact
behind everyday things.
Take a photo of a meal, product, or journey. Carbonly turns it into a clear carbon estimate—and shows you a lighter way forward.
⌁✦◎
Published factors, clearly sourced. See how each estimate is made.
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What are you holding?
Snap a photo or choose one from your library. Then confirm the item for a clear, useful estimate.
⌑Point, snap, discover
Your photo stays on this device.
YOUR CURRENT MONTH
A lighter month, one choice at a time.
Current month
YOUR FOOTPRINT
0.00kg CO₂eSet a monthly target to see progress.
WHERE IT COMES FROM
0 choicesYOU’RE BUILDING A HABIT
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RECENT CHOICES
Every choice tells a story.
THE 60-SECOND CARBON SPRINT
Which choice lands lighter?
Five quick comparisons. No guilt, no leaderboard—just the kind of pattern-spotting that makes everyday choices easier.
YOUR BEST—points
Round 1 of 50 pts
FOOD FACE-OFF
Which has the lower average footprint for the same 100 g portion?
Pick the option you think is lighter.
THE CARBONLY FIELD NOTES
Useful climate knowledge,
without the lecture.
Every number in this app is an estimate, but not a guess. These short reads show what the evidence says—and where it has limits.
THE SURPRISING BIT
Read the evidence ↗Your plate usually matters more than its postcode.
For the global food system, transport accounts for about 5% of emissions. What you eat is generally more important than how far it travelled.
Beef and peas can be worlds apart.
Global average life-cycle data puts beef from beef herds at 99.48 kg CO₂e per kg, and peas at 0.98 kg. The difference is mostly production and land use—not food miles.
See the dataset ↗Distance matters. So does how you move.
For UK travel, the 2026 reporting factors list 0.16591 kg CO₂e per km for an average petrol/diesel-unknown car, versus 0.03092 for national rail per passenger-km.
See the 2026 factors ↗Electricity has a postcode too.
Electricity emissions depend on the grid that makes it. The app’s electricity estimate uses the UK 2026 grid, transmission, and upstream factors; it is not a universal value.
How factors work ↗A single “carbon score” can hide a lot.
Farming impacts vary widely: the same food can differ by producer, location, and practices. Use the estimate to compare broad choices—not as a precise label for a specific brand.
Read the research ↗What does CO₂e actually mean?
Carbon dioxide equivalent combines gases with different warming effects into one number, using their warming effect over 100 years. It makes methane, nitrous oxide, and CO₂ comparable.
Understand CO₂e ↗Don’t chase perfect. Repeat the good.
Choose the lower-impact option when it is practical, then repeat it. A tracker is most useful when it helps you notice patterns, not when it makes you feel judged.
Try a comparison ↗METHOD & SOURCES
How Carbonly calculates.
Food estimates use global life-cycle averages from Poore & Nemecek (2018), processed by Our World in Data. Travel and electricity estimates use the UK Government’s 2026 conversion-factor dataset. Values are presented with their source units and are not product-specific life-cycle assessments.
Food source ↗UK source ↗