Optimism Average Buy Price Calculator
Work out your weighted average Optimism (OP) entry price across multiple buys — and see exactly where your break-even sits.
Result
Enter values to see the result.
Using the Optimism Average Buy Price Calculator
If you bought OP more than once, your break-even is not the midpoint of the two prices — it is the weighted average, where the larger buy pulls the average toward its own price. This calculator does that weighting for you across two entries, which is the case that trips people up most often when they average down.
The weighted average is also your cost basis for tax in most jurisdictions, though the accepted method differs by country — some require FIFO, others mandate an average-cost approach. Our region-by-region crypto tax guides cover which method applies where before you rely on this figure for a return.
OP competes directly with ARB for the same narrative, and the two tend to move together — often on the same rollup news. That is the practical argument for knowing your true average: it tells you the exact OP price at which the position stops being a loss, which is a much more useful anchor during a drawdown than the price of your first buy.
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
- How do I calculate my average OP price?
- Add up what you spent across all buys, then divide by the total number of OP you received. Weighting by size is essential — buying 1 OP high and 9 OP low gives an average far closer to the low price.
- Does averaging down lower my break-even?
- Yes, arithmetically — buying more OP below your entry pulls the weighted average down. It also increases your position size, so the same percentage move against you now costs more in dollars. Check the new position against your risk limit before adding.
- Do exchange fees change my cost basis?
- In most tax systems acquisition fees are added to cost basis, which raises your true break-even slightly above the raw weighted average. Fees are a few cents and move with Ethereum's data costs; chains built on the OP Stack share the same economics.
- How do I calculate average entry price?
- Average entry = total cost ÷ total coins. Multiply each buy's price by its amount, sum them, then divide by total coins held.
- What is averaging down?
- Buying more of an asset at a lower price to reduce your average entry, so a smaller recovery is needed to break even.
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.
Find the exact Optimism (OP) price that liquidates your leveraged position. Prefilled with the live OP price — set your leverage and direction.
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.
📖 Learn more
What dollar-cost averaging is, why it works in volatile crypto markets, its pros and cons, and how to model your own DCA plan.
HMRC has no separate crypto tax — it uses Capital Gains Tax, an income tax charge on rewards, and share-pooling rules that decide which coins you actually sold. Here is how all three work.
Germany treats crypto unusually kindly: hold for more than a year and the gain is completely tax-free. Here is how §23 EStG works, the €1,000 exemption limit, staking rules and the new DAC8 reporting.
Prefer the generic version without OP presets? Open the Average Entry Price Calculator.
For educational purposes only. Rates, fees and protocol parameters change — verify current figures with your exchange or validator before acting. Not financial advice.