How do I calculate my average ARB price?

Add up what you spent across all buys, then divide by the total number of ARB you received. Weighting by size is essential — buying 1 ARB high and 9 ARB low gives an average far closer to the low price.

Does averaging down lower my break-even?

Yes, arithmetically — buying more ARB 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. Arbitrum transactions typically cost cents, since the rollup amortises Ethereum data costs across a whole batch; that cost still moves with Ethereum's own fee market.

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.

Arbitrum · ARB

Arbitrum Average Buy Price Calculator

Work out your weighted average Arbitrum (ARB) entry price across multiple buys — and see exactly where your break-even sits.

Result

Enter values to see the result.

Using the Arbitrum Average Buy Price Calculator

If you bought ARB 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.

ARB has been under near-constant unlock pressure since launch, and trades on rollup competition and on Ethereum's own fee narrative. That is the practical argument for knowing your true average: it tells you the exact ARB 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.

Arbitrum at a glance

Launched: Chain August 2021; ARB token March 2023
Type: Optimistic rollup settling to Ethereum
Max supply: 10,000,000,000 ARB
Gas token: ETH — not ARB
Withdrawals: ~7-day challenge window for trustless exits to Ethereum
Native staking: None — ARB is used for governance

Frequently asked questions

How do I calculate my average ARB price?: Add up what you spent across all buys, then divide by the total number of ARB you received. Weighting by size is essential — buying 1 ARB high and 9 ARB low gives an average far closer to the low price.
Does averaging down lower my break-even?: Yes, arithmetically — buying more ARB 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. Arbitrum transactions typically cost cents, since the rollup amortises Ethereum data costs across a whole batch; that cost still moves with Ethereum's own fee market.
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 ARB calculators

Arbitrum Profit Calculator

Free Arbitrum (ARB) profit calculator. Enter your buy and sell price to see ARB profit, loss, ROI and fees — prefilled with the live ARB price.

Arbitrum DCA Calculator

Free Arbitrum (ARB) dollar-cost-averaging calculator. Model recurring ARB buys to see coins accumulated, average entry and portfolio value at today's live price.

Arbitrum Liquidation Price Calculator

Find the exact Arbitrum (ARB) price that liquidates your leveraged position. Prefilled with the live ARB price — set your leverage and direction.

Arbitrum Market Cap Calculator

Calculate Arbitrum (ARB) market cap from the live ARB price and circulating supply — plus FDV, and the price ARB would need to reach any target valuation.

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Prefer the generic version without ARB 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.