Research · Altcoins · Strand B

The ETH/BTC ratio

The ratio of one asset's price to another's is a relative-value series. It records how the two have been priced against each other, and it is silent about what either will be worth. This page explains what the ratio measures, how to read its trend, and why it is not a forecast.

Last reviewed 2026-09-21Source: CoinGecko historical price dataDefinition and interpretation only. No ratio level or return is asserted.

What the ratio is

The ETH/BTC ratio is the price of one ether expressed in bitcoin. It is a single number that combines two prices, and that combination is both its usefulness and its trap. When the ratio rises, ether has gained value relative to bitcoin over the period in question; when it falls, ether has lost value relative to bitcoin. Neither statement says anything about whether either asset rose or fell in the currency a reader actually holds.

This is the first thing to establish about any relative-value series. A ratio can rise while both assets fall, if the denominator falls faster. It can fall while both assets rise, if the numerator rises more slowly. A reader who sees a rising ratio and concludes that ether is "up" has made an assumption about the denominator that the ratio itself does not supply. The ratio is a statement about relative performance, and relative performance is only meaningful once the reference point is named.

The ratio is also a price ratio rather than a value ratio. It compares the market price of one unit of each asset, not the total capitalisation of the two networks. Those two measures can move differently, because each network's supply changes over time. A price ratio and a capitalisation ratio answer different questions, and the market-cap comparison covers the second.

How to read the trend

What a move in the ETH/BTC ratio does and does not tell a reader, depending on what the two underlying prices did.
Ratio move	What the underlying prices could be doing	What it means
Rising	Both prices rising, with ETH rising faster	ETH gained relative to BTC; both may still be up in absolute terms
Rising	Both prices falling, with BTC falling faster	ETH lost less than BTC; a rising ratio is not a rising price
Falling	Both prices rising, with BTC rising faster	BTC gained relative to ETH; a falling ratio is not a falling price
Flat	Both prices moving together, in either direction	No relative change; the ratio is silent about the absolute direction

Last reviewed 2026-09-21Source: Definitional arithmetic; no observed values are statedThe table enumerates the possible combinations rather than reporting a period.

The trend of the ratio is best read as a slow-moving statement about which of the two assets the market has been rewarding. It is not a signal, and it does not turn at identifiable points in advance. A ratio that has been rising for a year describes a year of relative outperformance; it does not imply that the next year will continue it. Trend persistence in a relative-value series is an empirical question, not a property of the series, and the honest answer is that it varies by period.

There is a further complication specific to this pair. Both assets trade continuously against each other and against the same settlement currencies, so the ratio is arbitraged in real time. That means the ratio cannot drift far from the prices that compose it, and it also means the ratio carries no independent information beyond those prices. It is a convenient summary, not a separate market with its own supply and demand.

Why it is not a forecast

A relative-value series is sometimes read as a valuation signal: a ratio near a historical low is taken to mean the numerator is cheap and due to recover. That reading requires an assumption the data does not support — that the ratio has a stable long-run level it returns to. Nothing in the construction of the series guarantees such a level. The ratio is the outcome of two independent price processes, and a level that looks extreme relative to a chosen history may simply be the new range.

The ratio is genuinely useful for one thing: describing relative performance over a stated window without having to quote two absolute prices. That is a real convenience for a reader trying to understand which asset the market rewarded. It is not a valuation model, and it does not carry an implied target. For the mechanics of how a price ratio relates to capitalisation, see Market Cap Explained.

Dataset, period, method and limitations

Dataset: Daily ETH and BTC closing prices from CoinGecko's historical data endpoints.
Period: From Ethereum's public trading history to the last-reviewed date stated above.
Method: The ratio is computed as the ETH close divided by the BTC close on each day. Trend descriptions refer to the direction of that series over a stated window. No ratio level, high, low or return is reported on this page.
Limitations: A price ratio is not a capitalisation ratio and the two can diverge as supply changes. The series has no guaranteed long-run level, so a historical range is not a valuation anchor. The ratio is fully determined by the two prices and carries no independent information.

What this page does not claim

This page does not state a ratio level, a historical range or a projected target. It does not claim that a ratio near a past extreme predicts a reversal, and it does not treat relative outperformance as evidence about either network's fundamentals. It does not present the ratio as a valuation model.

Sources and references

Every source below is named and linked. Where a page describes a method rather than a figure, the source is the specification or documentation that defines the method.

Ethereum historical data. CoinGecko, www.coingecko.com/en/coins/ethereum/historical_data: the ETH leg of the ratio.
Bitcoin historical data. CoinGecko, www.coingecko.com/en/coins/bitcoin/historical_data: the BTC leg of the ratio.
Market capitalisation methodology. CoinGecko, www.coingecko.com/en/methodology: how the price and supply inputs behind a capitalisation figure are assembled.