Is Ethereum Just Leveraged Bitcoin? Nine Years of Data
Ask why someone owns Ethereum instead of more Bitcoin and you usually get the same answer. Bitcoin is the engine of crypto, Ethereum is the same engine in a bigger gear. Bitcoin runs 10%, Ethereum should run 20%. You buy ETH to get Bitcoin's upside, only more of it.
That belief is not stupid. For one complete cycle it was exactly right, and the people who acted on it got paid. The problem is what happened next, and how few people went back to check.
It was true, and that is why it stuck
From the December 2018 bottom to the November 2021 top, Bitcoin gained 2,025%. Over the same window Ethereum gained 5,599%, nearly three times the move.
That is what genuine leverage looks like when it works. Anyone who bought Ethereum for amplified Bitcoin exposure in that window was correct, and had the returns to prove it. Beliefs that were never true are easy to discard. Beliefs that used to be true are the dangerous ones, because they come with receipts.
The cycle that broke it
Run the same measurement across every cycle leg and the pattern falls apart in the most recent one.
- 2018 bottom to 2021 top. Bitcoin +2,025%, Ethereum +5,599%. ETH delivered 2.8x Bitcoin's move.
- 2022 bear. Bitcoin -76.7%, Ethereum -77.0%. A tie, 1.0x.
- 2022 bottom to 2025 top. Bitcoin +691%, Ethereum +323%. ETH delivered 0.5x.
- Current bear, from the October 2025 top. Bitcoin -48.2%, Ethereum -59.3%. ETH delivered 1.2x of the fall.
Read the bottom two lines together, because that is the whole story. In the rally that just ended, Ethereum returned less than half of what Bitcoin did. In the decline that followed, it fell further than Bitcoin did. That is the exact opposite of the trade people believe they are making.
The simplest way to see it
Price Ethereum in Bitcoin instead of dollars. That single ratio strips out everything the broader market did and leaves only the question of which one you were better off holding.
One ETH is worth 0.0295 BTC today. That is the lowest it has been since January 2021, and roughly 74% below its 2018 peak ratio.
Put concretely, someone who rotated out of Bitcoin and into Ethereum at the 2021 top and simply held has about 59% fewer bitcoin today than if they had done nothing at all. No leverage ever arrived. The position just shrank against the thing it was supposed to amplify.
The same asymmetry shows up daily
Four cycle legs is only four observations. If the effect is real it should appear in daily data too, and it does.
On Bitcoin's best 10% of days, Ethereum captured 91% of the move. On Bitcoin's worst 10% of days, it took 107%. Less of the good, more of the bad.
Measured as a formal beta, splitting on whether Bitcoin rose or fell that day, Ethereum's beta is 0.83 when Bitcoin rises and 1.18 when it falls. Beta here simply means how far Ethereum moves for each 1% Bitcoin moves. A genuinely leveraged asset would sit at 2.0 or above in both directions.
Why I trust that number
A gap that convenient for a headline deserves to be attacked before it is published. Here is what it survived.
- Standard dual-beta regression. 0.83 up against 1.18 down, with a t-statistic of 9.4.
- Each side given its own intercept. 0.77 against 1.11. Gap holds.
- The wildest 1% of days removed. 0.83 against 1.11. Gap holds.
- Bootstrap, 2,000 resamples. 95% of outcomes fall between +0.21 and +0.47, and 100% of them are positive.
- Measured year by year. The gap is positive in 8 of the 9 years.
One honest caveat belongs here. Compare the simple average day instead of the beta and Ethereum looks symmetric, moving about 1.08 times Bitcoin on up days and 1.07 times on down days. The asymmetry lives in how Ethereum responds to the size of Bitcoin's move, not in the average day. Both facts are true. The cycle-leg returns are what settle which one actually mattered for a holder.
It changes shape by regime
Splitting the same measurement by whether Bitcoin was above or below its 200-day average explains the cycle table.
- Bull market. ETH beta of 0.65 on up days, 1.08 on down days.
- Bear market. ETH beta of 1.14 on up days, 1.23 on down days.
In a bull market Ethereum captures barely two thirds of Bitcoin's up moves while still absorbing all of its down moves. In a bear market it amplifies both directions. There is no regime in the data where the trade is in your favour.
And it is not diversification either
If Ethereum gave up some upside but protected you when Bitcoin fell, that would be a trade worth making. It does the reverse, and it offers no shelter, because the two barely separate.
The 90-day correlation sits at 0.88 today against a long-run average of 0.83, where 1.0 would mean the two move identically. It has never closed a single year below 0.76. Not in a bull market, not in a bear market, not in the 2020 crash and not through the 2022 collapse.
For scale, here is Bitcoin measured against everything else over the same period. Lower means more genuinely separate.
- Ethereum +0.88 today, +0.83 average
- S&P 500 +0.42 today, +0.27 average
- Nasdaq 100 +0.41 today, +0.27 average
- Gold +0.38 today, +0.10 average
- Long US bonds +0.10 today, -0.02 average
- US dollar index -0.33 today, -0.11 average
Ethereum is the least diversifying asset on that list. The Nasdaq separates from Bitcoin roughly twice as much as Ethereum does. Gold separates far more. If the reason you hold ETH is to spread risk around a Bitcoin position, that comparison is the answer.
What this does not say
It does not say Ethereum is a bad asset. If you own it because you believe in what it is building, that is a judgment about technology and adoption, and nothing measured here touches it.
It does not predict the next cycle. The relationship already changed once, from 2.8x to 0.5x. Something that changed once can change again. What the data rules out is assuming today's Ethereum behaves like 2020's.
It does not say sell. That depends on your position, your timeframe and your reasons, none of which a study can see.
What it does say is narrow and firm. If you hold Ethereum in order to get more Bitcoin upside, the last full cycle and the current bear both say you are not getting it.
The part that generalises
The wider lesson is worth more than the Ethereum call. Beliefs rarely die because they were wrong to begin with. They die because the conditions that made them true quietly changed, and the people holding them never rechecked. This one had five years of evidence behind it before it stopped working, which is exactly what made it so hard to notice.
Education, not financial advice.
Common questions
Is Ethereum leveraged Bitcoin?
It was for one cycle and is not now. From the 2018 bottom to the 2021 top Ethereum returned 5,599% against Bitcoin's 2,025%, about 2.8 times the move. From the 2022 bottom to the 2025 top Bitcoin gained 691% and Ethereum gained 323%, roughly half. Since the October 2025 top Ethereum is down 59.3% against Bitcoin's 48.2%.
What is Ethereum's beta to Bitcoin?
About 1.00 across the full history, but it splits by direction. Ethereum's beta is 0.83 on days Bitcoin rises and 1.18 on days Bitcoin falls. A genuinely leveraged asset would be at 2.0 or above in both directions. The gap holds in 8 of the last 9 years and survives outlier removal and a 2,000-sample bootstrap.
How correlated are Ethereum and Bitcoin?
The 90-day correlation is 0.88 today against a long-run average of 0.83, where 1.0 means identical movement. It has never closed a calendar year below 0.76 since 2018. By comparison Bitcoin's correlation to the Nasdaq is 0.41 and to gold is 0.38, so Ethereum is the least diversifying of the three.
Does holding both Bitcoin and Ethereum diversify my portfolio?
Very little. At a correlation of 0.88 the two behave close to a single position. Ethereum also captures only 91% of Bitcoin's best days while taking 107% of its worst, so it adds downside without adding matching upside. Holding both is closer to one bet taken twice than to two separate bets.
What is the ETH to BTC ratio now?
One ETH is worth about 0.0295 BTC, the lowest since January 2021 and roughly 74% below the 2018 peak ratio. Someone who moved from Bitcoin into Ethereum at the 2021 top and held has about 59% fewer bitcoin than if they had not moved at all.
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Education, not financial advice. Trading involves real risk.