Optimism Market Cap Calculator
Calculate Optimism (OP) market cap from the live OP price and circulating supply — plus FDV, and the price OP would need to reach any target valuation.
Result
Enter values to see the result.
Using the Optimism Market Cap Calculator
Market cap is simply the live OP price multiplied by the number of coins in circulation, and this page does that with the current price loaded for you. The supply field starts at roughly 2.29 billion OP, which is where it stood on 5 August 2026 — supply moves, so check it against a market data source if you need an exact figure, and edit the field.
Optimism's supply is bounded at 4.29 billion OP, so the fully diluted valuation is a real ceiling rather than an open-ended one. The MC/FDV row shows how much of that supply is already trading: the closer it is to 100%, the less future dilution is waiting for you, and for OP that gap is currently 53%.
The comparison field answers the question people actually come here for: what would OP be worth at some other valuation? Enter a target market cap and the calculator returns the implied OP price and the multiple from here. It is arithmetic, not a forecast — reaching a larger cap means absorbing every holder willing to sell on the way, and oP competes directly with ARB for the same narrative, and the two tend to move together — often on the same rollup news.
Optimism at a glance
- Launched
- Chain and OP token 2022
- Type
- Optimistic rollup; OP Stack powers the Superchain
- Max supply
- 4,294,967,296 OP (2³²)
- Gas token
- ETH — not OP
- Governance
- Token House plus a Citizens' House for retroactive funding
- Native staking
- None — OP is used for governance
Frequently asked questions
- What is Optimism's market cap?
- Multiply the live OP price by the circulating supply — around 2.29 billion OP as of 5 August 2026. The calculator above loads the current price and does this for you; the result updates the moment you change either field.
- How do I calculate the OP price at a given market cap?
- Divide the target market cap by the circulating supply. The comparison field above does it directly and also shows the multiple against today's OP price, which is usually the more sobering number.
- What is Optimism's fully diluted valuation?
- FDV prices all 4.29 billion OP at the current price, including coins not yet circulating. The difference between FDV and market cap is the supply still to enter the market — worth knowing before you treat market cap as the whole picture.
- How do you calculate crypto market cap?
- Market cap = current price × circulating supply. A coin at $2 with 500 million coins in circulation has a $1 billion market cap. Note that it is circulating supply, not total supply — tokens still locked in vesting contracts or a treasury are excluded.
- What is the difference between market cap and FDV?
- Market cap uses only the coins in circulation today. Fully diluted valuation (FDV) prices every coin that will ever exist, including locked and unminted supply. A project with a $200M market cap but a $2B FDV has 90% of its supply still to hit the market.
More OP calculators
Free Optimism (OP) profit calculator. Enter your buy and sell price to see OP profit, loss, ROI and fees — prefilled with the live OP price.
Free Optimism (OP) dollar-cost-averaging calculator. Model recurring OP buys to see coins accumulated, average entry and portfolio value at today's live price.
Work out your weighted average Optimism (OP) entry price across multiple buys — and see exactly where your break-even sits.
Find the exact Optimism (OP) price that liquidates your leveraged position. Prefilled with the live OP price — set your leverage and direction.
Prefer the generic version without OP presets? Open the Crypto Market Cap Calculator.
For educational purposes only. Rates, fees and protocol parameters change — verify current figures with your exchange or validator before acting. Not financial advice.