Carbon Price
Somewhere in your organisation, a tonne of CO₂e already has a price. It may be set by a regulator, by an allowance market, by a finance team running a shadow figure — or by nobody, in which case the price is zero and that is a decision too.
A carbon price is simply what it costs to emit one tonne of CO₂e. The difficulty is never the definition. It is that two quoted prices are almost never comparable, and the headline number is the part that tells you least.
A carbon price is the cost of emitting one tonne of CO₂e, in $/tCO₂e. It reaches an organisation three ways: a carbon tax, an emissions trading scheme, or an internal price. Across the World Bank’s 87 instruments the range is wide, and two quoted prices are rarely comparable.
Definition — The Price of Emitting a Tonne
A carbon price attaches a monetary cost to greenhouse gas emissions, denominated per tonne of CO₂ equivalent. Its purpose is to move a cost that would otherwise fall on everyone onto the party creating it, so that avoiding a tonne becomes a decision with a number attached rather than a matter of preference.
The concept is straightforward. The confusion is that “the carbon price” is used to mean at least four different things — a statutory tax rate, a traded allowance price, a company’s own internal figure, and an economist’s estimate of the damage a tonne causes. They are not interchangeable, they are not the same order of magnitude, and only the first two are anything you can be billed for.
Definition at a glance
| What it is | The cost of emitting one tonne of CO₂e |
|---|---|
| Unit | $/tCO₂e (the World Bank’s comparable metric is US$ nominal) |
| How it reaches you | A tax, an ETS, or an internal price |
| Global range | 0.11 to 169.71 $/tCO₂e across 87 instruments (1 April 2026) |
| Median | About $22/tCO₂e — most instruments sit far below the headline names |
| Comparable? | No. Coverage, point of regulation and free allocation differ — see below |
| Effect on your inventory | None. A price values emissions; it does not change how they are counted |
Three Ways a Price Reaches You
Every carbon price an organisation encounters arrives through one of three routes, and each has its own page here because each behaves differently:
| Route | Who sets the price | What you actually pay |
|---|---|---|
| Carbon tax | The government, as a statutory rate | The rate × your covered emissions. The price is known; the quantity abated is not. |
| Emissions trading (ETS) | The market, under a regulated cap | The allowance price × your uncovered emissions. The quantity is capped; the price is not. |
| Internal carbon price | You | Nothing externally — it steers capital decisions, or moves money between internal budgets. |
A fourth figure circulates and is worth naming so it is not mistaken for the others: the social cost of carbon, an economic estimate of the damage one tonne causes. It informs policy appraisal and appears in some internal pricing. Nobody invoices you for it.
What a Tonne Actually Costs
Read live from the World Bank Carbon Pricing Dashboard, priced at 1 April 2026. A selection across the range, highest first:
| Jurisdiction | Instrument | $/tCO₂e |
|---|---|---|
| Norway | Carbon tax | 169.71 |
| Uruguay | Carbon tax | 165.61 |
| Sweden | Carbon tax | 154.55 |
| Switzerland | Carbon tax | 149.81 |
| European Union | ETS | 84.89 |
| Canada | ETS | 68.4 |
| Washington State | ETS | 65.27 |
| United Kingdom | ETS | 54.83 |
| Singapore | Carbon tax | 34.99 |
| California | ETS | 29.05 |
| RGGI (US north-east) | ETS | 26.43 |
| United Kingdom | Carbon price support | 23.94 |
| South Africa | Carbon tax | 18.28 |
| China | National ETS | 11.56 |
| Japan | Carbon tax | 1.82 |
| Poland | Carbon tax | 0.11 |
Two things stand out. The spread is more than a thousandfold from the bottom of the table to the top. And the median instrument prices a tonne at roughly $22 — well below the European and Nordic figures that dominate the conversation. Most of the world’s priced carbon is priced cheaply.
The average, worldwide. The World Bank’s State and Trends of Carbon Pricing 2026 puts the average price across implemented instruments at nearly US$21 a tonne in 2026, up from US$10 in 2016. Those 87 carbon taxes and emissions trading systems cover 29% of global greenhouse gas emissions, and raised more than US$107 billion for governments in 2025. Norway’s carbon tax is now the highest price, just above Uruguay’s.
The full set of 87 instruments is published as carbon price reference values, and the carbon pricing hub covers how to work out which one applies to you.
Quick converters: restate a price on a different basis with price per tCO₂ to price per tC — the carbon-versus-CO₂ distinction that quietly changes a figure by 3.67× — or carbon price per tonne to per kg.
Why Two Quoted Prices Aren’t Comparable
This is the part that matters, and the reason a league table of carbon prices is close to meaningless read straight down the column. Our own data layer states it plainly in its methodology note: prices are not directly comparable across instruments because of differences in coverage, compliance, point of regulation, and compensation.
Coverage. An instrument prices some share of a jurisdiction’s emissions, not all of them. A $150 tax reaching a tenth of an economy does less than a $25 scheme reaching four fifths. The headline rate says nothing about reach.
Point of regulation. A price applied upstream at the fuel producer behaves differently from one applied at the smokestack — different parties are liable, and the cost arrives through different channels.
Compensation. Free allocation, rebates and exemptions routinely give much of the money back. An installation receiving free allowances faces the market price only at the margin, not on every tonne it emits.
The practical rule: a quoted carbon price is a rate, not a burden. To know what an instrument actually costs a business you need the rate, the covered share, and whatever compensation applies — and the last two rarely travel with the number.
Where a Carbon Price Shows Up in Your Numbers
Nowhere in your emissions inventory. This is worth stating flatly, because the two are routinely conflated: a carbon price values emissions; it does not measure them. Your Scope 1, 2 and 3 figures are identical whether the tonne costs $0 or $170.
What a price does change is everything downstream of the inventory — the cost of a compliance obligation, the payback on an abatement project, the ranking of options in a marginal abatement cost curve, and the transition-risk disclosures that frameworks now ask for. Under ESRS E1 an internal carbon price must be disclosed with the volume it applies to, which is the same coverage question arriving from the other direction.
Common Confusions
- Comparing two headline rates. Without coverage and compensation the comparison is not wrong so much as empty. A high rate on a narrow base can price less carbon than a low rate on a broad one.
- Treating a carbon price as an emission factor. It is a cost per tonne, not a quantity per unit of activity. It multiplies a result; it never appears inside one.
- Assuming a price changes the inventory. It does not. Pricing sits downstream of measurement, and an inventory is identical at $0 and at $170.
- Mixing per-tonne-carbon with per-tonne-CO₂. A price quoted per tonne of carbon is 3.67× the same price per tonne of CO₂. Older economics literature uses $/tC; compliance instruments use $/tCO₂e.
- Quoting an ETS price as if it were fixed. An allowance price is a market price on a date. The figures here are 1 April 2026; they move.
- Confusing the price with the social cost of carbon. One is what you pay, the other is an estimate of damage done. They are not the same number and rarely the same magnitude.
Related Terms, Standards, and Tools
Frequently Asked Questions
The cost of emitting one tonne of CO₂e, quoted as $/tCO₂e. It reaches an organisation through a carbon tax set by statute, an emissions trading scheme where a capped market sets the price, or an internal price a company applies to its own decisions. The definition is simple; the comparability is not.
It depends entirely on where. Across the World Bank’s 87 tracked instruments the range runs from 0.11 [GreenCalculus carbon_pricing.pol.carbon_tax · WORLD BANK · v2026.262] to 169.71 USD/tCO2e [GreenCalculus carbon_pricing.nor.carbon_tax · WORLD BANK], with a median near $22. The EU ETS is 84.89 [GreenCalculus carbon_pricing.eu.ets · WORLD BANK], the UK ETS 54.83 [GreenCalculus carbon_pricing.gbr.ets · WORLD BANK], and China’s national scheme 11.56 [GreenCalculus carbon_pricing.chn.ets · WORLD BANK]. Prices are as at 1 April 2026 and move.
Because the rate is only one of three variables. Instruments differ in coverage — what share of the jurisdiction’s emissions they touch — in point of regulation, and in compensation such as free allocation and rebates. A high rate on a narrow base can price less carbon than a low rate on a broad one, so reading a league table straight down the column tells you very little about which jurisdiction actually prices carbon hardest.
No. A price values emissions, it does not measure them — your Scope 1, 2 and 3 figures are the same whether a tonne costs nothing or $170. What a price changes is everything downstream: compliance cost, project payback, abatement ranking, and the transition-risk disclosures frameworks ask for.
A carbon price is what someone charges you. The social cost of carbon is an economic estimate of the damage one tonne causes. The first is a market or statutory fact you can be billed for; the second is a modelled figure used in policy appraisal and sometimes as the basis for an internal price. They are frequently quoted in the same breath and are not the same number.
No — they differ by a factor of 3.67, the mass ratio of CO₂ to the carbon in it. A price of $100 per tonne of carbon is about $27 per tonne of CO₂. Older economics literature tends to quote $/tC while compliance instruments quote $/tCO₂e, so the two circulate together. The converter handles it.
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