Estimate the CO2 emissions behind your cryptocurrency use from energy per transaction, how many transactions you make, and the carbon intensity of the electricity grid involved.
Quick Facts
Method
Energy per transaction × transaction count × grid carbon intensity
Total CO2e (kg) = Energy/tx (kWh) × Transactions × Carbon intensity (kg CO2/kWh) × Years
Results
Calculated
Estimated CO2 emissions
—
Total for the period, in kg CO2e
Energy consumed
—
Total electricity used, in kWh
Driving equivalent
—
Miles in an average passenger car
Trees to offset (1 year)
—
Mature trees absorbing CO2 for a year
Ready
Enter your transaction energy, count, and grid intensity, then press Calculate.
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How to use this calculator
Estimate the carbon footprint of your cryptocurrency activity by entering how much energy a single transaction uses, how many transactions you make per year, and the carbon intensity of the electricity grid involved. Click Calculate to see your total emissions plus driving and tree-offset equivalents. Click Clear to reset all fields and start a new estimate.
The formula
Total CO2 emissions (kg CO2e) = Energy per transaction (kWh) × Number of transactions × Grid carbon intensity (kg CO2 per kWh) × Number of years. This is the standard approach used by crypto energy-tracking projects: multiply electricity used by how carbon-intensive that electricity was to generate. Energy consumed is simply energy per transaction × transactions × years, before the carbon multiplier is applied.
Why energy per transaction varies so much
Proof-of-Work networks like Bitcoin secure the blockchain through mining — many computers competing to solve a computational puzzle — which is deliberately energy-intensive and can run into the hundreds of kWh per transaction depending on network activity. Proof-of-Stake networks like Ethereum (since its 2022 Merge) secure the chain by having validators lock up (stake) coins instead of computing, which the Ethereum Foundation has estimated cut network energy use by more than 99.9%. Enter the figure that best matches the network and time period you are estimating; adjust it as network conditions change.
Interpreting the results
The highlighted cards show your total estimated emissions and the energy behind them. The driving and tree equivalents translate that CO2 mass into more tangible terms using commonly cited reference conversions — about 0.404 kg CO2 per mile for an average passenger vehicle, and about 21.8 kg CO2 absorbed per mature tree per year. These are illustrative comparisons, not offset guarantees.
Frequently Asked Questions
How is a cryptocurrency's carbon footprint calculated?
The standard method multiplies the electricity used per transaction (kWh) by the number of transactions, then multiplies that total energy by the carbon intensity of the electricity grid (kg CO2 per kWh) that powered it. The result is a mass of CO2-equivalent emissions attributable to that activity.
Why does energy per transaction vary so much between coins?
It depends on the consensus mechanism. Proof-of-Work networks like Bitcoin secure the ledger with competitive computation (mining), which can use hundreds of kilowatt-hours per transaction. Proof-of-Stake networks like post-Merge Ethereum secure the ledger by having validators stake coins instead of computing, cutting energy use by well over 99%. Enter the figure that matches the network you are estimating.
What is grid carbon intensity and why does it matter?
Grid carbon intensity is how much CO2 is released per kWh of electricity generated, and it depends on the local fuel mix. A grid running mostly on coal can exceed 0.9 kg CO2/kWh, while a hydro- or nuclear-heavy grid can fall below 0.1 kg CO2/kWh. The same energy use produces very different emissions depending on where the electricity was generated, so adjust this figure to match the relevant region.
How accurate are the driving and tree equivalents?
They use widely cited reference conversions — about 0.404 kg CO2 per mile for an average passenger vehicle, and about 21.8 kg CO2 absorbed per mature tree per year — to translate an abstract CO2 mass into something tangible. Treat them as illustrative comparisons, not precise offsets.