Ethereum (ETH) is 50.7× the size of Bitcoin Cash (BCH) by market capitalisation. Over the past 1 year, ETH is ahead by 8.8 percentage points (ETH -36.9% against BCH -45.7%). Their daily returns move loosely together (correlation 0.59 across 399 shared trading days). BCH has been the more volatile of the two, at 78% annualised against ETH's 62%.
ETHBCH
0.59over 399 shared trading days
Measured on daily returns rather than on prices. Two assets that both simply trend upward score near 1.0 on raw prices whether or not they move together, so returns are what answer the question people mean by correlation.
| Metric | ETH | BCH |
|---|---|---|
| Max drawdown (400d) | -66.5% | -70.9% |
| Risk-adjusted return (90d) | 0.36 | 0.27 |
| Best 30 days (past year) | +34.1% | +34.0% |
| Worst 30 days (past year) | -44.6% | -56.8% |
Relative strength over 90 days: BCH outperformed ETH by 6.9% — measured on the ETH/BCH ratio, so it holds regardless of market direction.