How it works

Two ways to ask “what if”. Here’s an example with ETH and BTC.

Market cap

What if ETH had BTC's market cap?

We give ETH the same market cap as BTC, then divide by the supply used for ETH. NOW uses the current market cap of BTC; ATH uses its historical high.

Peak ratio

What if ETH hit its peak BTC ratio?

We find the highest recorded ETH/BTC price ratio in our available daily history, then apply it to the price of BTC today. This shows what one ETH would cost if it regained that relative strength.

Use the question below your result to flip between the two modes.

What if A had B's market cap?

Select A
Select B

ARB at a $20B market cap

As of Sep 15, 2026, if Arbitrum (ARB) had a market cap of $20B, one ARB would be worth $2.99, 20.46x its current price of $0.1463. Its market cap today is $977.38M.

Price of Arbitrum at a $20B market cap: ($20B ÷ $977.38M) × $0.1463 = $2.99.

Questions

What would ARB be worth at a $20B market cap?
Arbitrum (ARB) would be worth $2.99 per coin at a $20B market cap. That is 20.46x its price of $0.1463 on Sep 15, 2026.
How much would Arbitrum need to grow to reach a $20B market cap?
Arbitrum would need to grow 20.46x. Its market cap is $977.38M today.

Data: CoinGecko, refreshed daily. Last update Sep 15, 2026.