Crypto Portfolio Allocation Calculator

This model splits capital across Bitcoin, Ethereum, large, mid and small-cap altcoin tiers and stablecoins, computing each position as total value times its weight. The expected return and drawdown figures are weighted averages of per-tier assumptions, which is the correct arithmetic for a portfolio mean but not for its risk: variance depends on covariances, and crypto assets are heavily correlated, with altcoin-to-Bitcoin correlations often above 0.8 and rising toward 1 during selloffs. The market cap tiers are conventional rather than official, with large cap generally meaning above roughly 10 billion dollars, mid cap 1 to 10 billion, and small cap under 1 billion. The drawdown assumptions are the most defensible output. Bitcoin fell roughly 84 percent from its December 2017 peak near 19,800 dollars to about 3,200 dollars a year later, and roughly 77 percent from 69,000 dollars in November 2021 to under 16,000 in November 2022. Altcoins typically fall further, and many never recover their prior highs. Treat the expected return inputs with more suspicion: they are cycle-average estimates rather than forecasts, and averaging optimistic tier returns compounds that optimism. The model also ignores rebalancing effects, trading fees, tax on realized gains, and the survivorship bias in any tier average built only from tokens still listed today.

The weighting framework descends from Harry Markowitz, whose 1952 Journal of Finance paper Portfolio Selection introduced mean-variance analysis and the principle that an asset should be judged by its contribution to portfolio risk rather than in isolation; he shared the 1990 Nobel Memorial Prize in Economics for the work. Tiering by market capitalization came later, from equity index practice, as FTSE, MSCI and Russell built large, mid and small-cap segments through the 1980s and 1990s. Crypto borrowed both conventions largely intact. Applying them to digital assets began in earnest after 2017. Index providers such as Bitwise, which launched a 10-asset crypto index fund in 2017, and data firms including Messari and CoinGecko published tier definitions and cap-weighted benchmarks that gave the categories concrete membership. Institutional allocation research followed, including Yale endowment manager David Swensen committing to crypto venture funds in 2018 and a run of bank research notes proposing 1 to 5 percent crypto sleeves inside conventional portfolios. The stablecoin allocation is a newer idea, practical only after Tether in 2014 and USD Coin in 2018 gave holders a dollar-denominated position that stays inside the crypto settlement system.