How to Buy Carbon Offsets: Prices, Projects, and What You Actually Get

You can buy carbon offsets online in just minutes: choose a verified project, check its registry and vintage, confirm the price per tonne, purchase the exact amount you need (from 1 kg or 1 tonne, depending on the credit type), and retire it (claim its environmental benefit) in your name. On Carbonmark's marketplace, prices currently start under $1 per tonne of CO₂e, and every purchase ends with a publicly verifiable retirement certificate.

Importantly, on Carbonmark, all of our carbon retirements, and the trading lifecycle of a credit, are fully traceable back to the registry of origin. What separates a real offset purchase from a feel-good receipt is its proof of retirement: a permanent, public record that one specific credit was used once, by you, and can never be sold again.

Key Takeaways

• Carbon offsets and carbon credits are functionally the same instrument. "Credit" names the unit (1 tonne of CO₂e avoided or removed); "offset" describes what you do with it.
• Live prices on Carbonmark span $0.10 to $650 per tonne across 91 projects in 25 countries (August 2026). Renewable energy credits trade under $3, most forestry credits between $1 and $24, and durable removals from roughly $110.
• Buying takes five steps: choose a project type, check registry and vintage, confirm the price per tonne, purchase, and retire the credit in your name.
• A completed purchase produces a retirement certificate with the project, vintage, exact tonnage, beneficiary name, and a permanent on-chain retirement ID that anyone can verify.
• Fractional purchases start at 0.001 tCO₂e (1 kg), so individuals and businesses can offset exact footprints instead of rounding to whole tonnes.

What is a carbon offset, and is it the same as a carbon credit?

A carbon offset and a carbon credit are functionally the same instrument: a verified claim to one tonne of CO₂e avoided or removed from the atmosphere, issued by a registry against a real project. "Credit" describes the unit you buy. "Offset" describes the use: retiring that credit to compensate for emissions you could not eliminate.

So when you buy carbon offsets, you are buying carbon credits with the intent to retire them. The instrument, the registries, and the quality standards are identical; only the vocabulary changes. For a deeper look at how these instruments and the markets around them work, see our overview of carbon markets.

One key principle to note before you buy anything: offsets compensate for the emissions you cannot yet avoid, reduce, or replace. I.e., they are the final step of the mitigation hierarchy, not a substitute for it.

How much do carbon offsets cost?

Carbon offsets currently cost between $0.10 and $650 per tonne of CO₂e on Carbonmark (August 2026). Renewable energy credits trade for under $3, most forestry credits between $1 and $24, and durable removals such as biochar and mineralized carbon storage from roughly $110 to $650. Project type, vintage, registry, and co-benefits drive the spread.

Live price ranges by project type, pulled from Carbonmark marketplace data on August 24, 2026:

Project type	Live price range (per tCO₂e)	Median
Renewable energy	$0.10 – $2.80	$0.70
Energy efficiency	$1.23 – $3.22	$1.26
Forestry (REDD+, afforestation, IFM)	$0.80 – $23.80	$7.00
Waste disposal & compost	$14 – $21	$21.00
Blue carbon	$42 – $650	$229.00
Soil & agriculture	$62 – $81	$81.20
Biochar (durable removal)	~$110	$109.83

Why the 6,500x spread? Four factors have the greatest influence here:

• Project type and durability. Avoided-emissions credits are abundant and result from generally less costly renewable energy projects; engineered removals that lock carbon away for centuries are produced from newer technologies, often still being scaled up, and are thus more expensive.
• Vintage. The year the impact occurred. Older vintages trade at a discount. Importantly, when considering the same technology type and carbon project methodology, the vintage year is not necessarily an indication of quality or impact. Treat different vintages as equal in such cases.
• Registry and methodology. Stricter or newer methodologies that have undergone the latest due diligence sometimes price higher.
• Co-benefits. Verified community, biodiversity, or UN Sustainable Development Goal outcomes attract buyers looking for positive impact beyond the carbon itself.

Prices move with supply, so treat any published figure as a snapshot; our marketplace shows the live number. For the full breakdown, read our carbon credit pricing methodology.

How do you buy carbon offsets? (step by step)

To buy carbon offsets: pick a project type that matches your goals, verify its registry and vintage, confirm the live price per tonne, purchase the exact quantity you need, and retire the credits in your name. On Carbonmark the whole flow, from browsing to holding a retirement certificate, takes a few minutes.

Here is the process in full:

1. Choose a project type. Nature-based protection, reforestation, renewable energy, or durable removal (more on choosing below).
2. Check the registry and vintage. Confirm the credit is issued by a recognized standard (Verra, Puro.earth, ICR, CMARK, and others) and note the year of impact.
3. Confirm the price per tonne. Compare live listings; the same project can have multiple listings at different prices.
4. Purchase the amount you need. From 0.001 tCO₂e (1 kg) up to bulk volume with no account minimums.
5. Retire the credits in your name. Enter a beneficiary name and an optional retirement message (e.g. ACME Corp; Retired to compensate for 2026 operational emissions). Retirement is what makes the offset yours. An unretired credit can still be resold.
6. Save your certificate. You receive a retirement certificate and a permanent retirement ID recorded on a public blockchain. You can view your historical retirements directly from your Carbonmark account when logged in.

What do you actually get when you buy?

A completed offset purchase on Carbonmark produces a retirement certificate: a public record naming the beneficiary, the project and vintage, the exact tonnage retired, and a permanent retirement ID anchored on a public blockchain. Anyone can verify it. Nobody can edit it, double-count it, or resell it.

Here is a real one. On August 22, 2026, a buyer retired 0.061 tonnes of CO₂e from the Harvey Manning Park Expansion forestry project (vintage 2021) in Washington State. The certificate records the beneficiary, the retirement message, the project and vintage, and a retirement ID that resolves to an immutable on-chain transaction on Base.

Notice two important differentiators enabled by Carbonmark's tech infrastructure: 1) The quantity is 0.061 tonnes, not a rounded whole number. Our enablement of fractional retirement means you offset your actual footprint. And 2) the record is public infrastructure verifiable by any 3rd party, not a PDF in an inbox.

Where can you buy carbon offsets?

You can buy carbon offsets through a marketplace, a broker, or directly from a project developer. Marketplaces show live prices and inventory. However, most marketplaces do not enable instant retirement: this is an area that Carbonmark has played a leading role in developing through the usage of public blockchain technology. In the case of brokers, they often assemble bespoke portfolios for a fee and may involve multiple intermediaries. Carbon Project Developers sell their own projects, usually at volume. Carbonmark often works directly with Carbon Project Developers to help them avoid intermediaries and sell directly to end-buyers. As a buyer, the right route depends on how much transparency, choice, and speed you need.

• Marketplace (like Carbonmark): compare live prices across projects, buy any quantity, retire instantly (enabled on Carbonmark), and receive public proof. Best when you want transparent pricing and immediate settlement.
• Broker or reseller: useful for large, curated portfolios with advisory support, but pricing is typically opaque and fees are baked into the quote. Carbonmark's sales team is active on this front for large business clients that require consulting support when building their offsetting portfolio.
• Project developer direct: buy from the source, usually in volume with negotiated contracts. Strong for long-term offtake, impractical for small or immediate purchases.

We compared these routes in detail in brokers vs. carbon credit marketplaces.

Which carbon offsets should you buy?

Buy the offset that matches the claim you want to make. Avoidance credits (forest protection, renewable energy) are affordable and fund real projects today. Removal credits (reforestation, biochar, mineralized storage) physically draw down carbon and support stronger long-term claims. Many buyers blend both: volume in avoidance, a growing share in removals.

We've included three live examples from our marketplace at various price points below:

• Agroforestry (nature-based removal), $9.77/t: Forestal Río Aquidabán in Paraguay is restoring 301 hectares of degraded grassland through silvopastoral agroforestry, planting trees alongside working cattle pasture. One of Paraguay's first climate forest initiatives, issued under the International Carbon Registry (ICR).
• Biochar (durable removal), ~$110/t: Aperam BioEnergia in Brazil converts biomass residues into biochar under Puro.earth, locking carbon into a stable form for centuries.
• Mineralized storage (engineered removal), $650/t: Limenet's Augusta site in Italy stores CO₂ as calcium bicarbonate in seawater, at the frontier of ocean-based storage.

Frameworks like the Oxford Principles point the same direction: start where you can act now, and shift toward durable removals over time. A $10 agroforestry credit and a $650 engineered-storage credit are not competing products. Rather, they are tools for different stages of a credible climate strategy.

Buying carbon offsets for a business vs. as an individual

Individuals can buy carbon offsets in a single checkout: pick a project, enter any amount from 1 kg, and retire in your own name with a public certificate. Businesses get the same flow plus volume purchasing, invoicing, and an API that automates offsetting per transaction, per product, or per report. Note that certain carbon projects, e.g., those issued under Puro.earth and EcoRegistry (as of August 2026) can only be retired as whole tonnes, rather than fractional units. We're currently working with these registries to support fractionalization in the future.

• As an individual: offset a flight, a year of driving, or your household footprint with a fractional purchase. The certificate carries your name; no registry account required.
• As a business: buy in bulk for annual commitments, or integrate the Carbonmark API to price, quote, and retire credits programmatically. The automated retirement behind the certificate above, for every credit sold on our marketplace, runs on exactly this rail.

Start with a specific purchase

Offsetting done right is specific: a named project, a real price, an exact tonnage, and public proof of retirement. That standard is now available to anyone, from a 1 kg purchase to an automated corporate program.

Browse live projects and prices on the Carbonmark marketplace and retire your first credits today.

Sources: All prices, project counts, and project examples in this article are drawn from live Carbonmark marketplace data (v19 API), pulled August 24, 2026. Prices change with supply; the marketplace shows current figures.