Portfolio Allocation Calculator
Divide your total crypto portfolio across Bitcoin, Ethereum and altcoins to see the exact dollar amount allocated to BTC. Use it to size positions and check that your allocations sum to 100%.
Last updated: May 2026
Compare with similar
About this calculator
This calculator multiplies your total portfolio value by the percentage you choose to allocate to Bitcoin, returning the dollar amount that should be held in BTC: BTC Amount = totalPortfolio × (btcAllocation / 100). Although the input form lets you enter Ethereum and altcoin percentages too, the displayed result focuses on Bitcoin sizing — use the same formula in your head (or re-run with the other percentage in the BTC field) to size ETH and altcoin slices. The three percentages should sum to 100% if your entire portfolio is in crypto, or sum to less if you hold cash/stablecoins as well. Edge cases: if any allocation is negative or the three sum to over 100%, the math still runs but the result is meaningless; if your portfolio also includes traditional assets, use this only on the crypto portion. Typical allocation frameworks vary widely: a conservative crypto-curious investor might run 70% BTC / 20% ETH / 10% altcoins, an ETH-maximalist 30% BTC / 60% ETH / 10% altcoins, and a high-conviction altcoin trader 30% BTC / 30% ETH / 40% altcoins. The right mix depends on risk tolerance, time horizon, conviction, and tax considerations such as harvested losses or jurisdiction-specific holding-period rules. Re-balance periodically (quarterly is common) to prevent winners from drifting the portfolio away from your target weights.
How to use
Portfolio $20,000, target 60% Bitcoin. Bitcoin amount = $20,000 × 0.60 = $12,000 to hold in BTC. Adjust the Bitcoin Allocation % to see the dollar amount for your target weight; the remainder goes to your other assets per your own plan.
Frequently asked questions
What is a sensible allocation between Bitcoin, Ethereum and altcoins?
There is no single 'correct' allocation; it depends on your risk tolerance, time horizon, conviction in each asset's thesis, and your overall portfolio context. A common conservative framework is 70% BTC / 20% ETH / 10% altcoins, treating Bitcoin as the lowest-risk crypto base and altcoins as a small high-risk satellite. An ETH-believer might flip to 30% BTC / 60% ETH / 10% altcoins. A 'crypto index' approach roughly mirrors market cap (currently ~50% BTC / 17% ETH / 33% everything else), while a pure-Bitcoin maximalist holds 100% BTC. For most retail investors, putting more than 10–20% of total net worth into crypto in the first place is the dominant risk decision; the BTC/ETH/altcoin split inside that crypto allocation matters less than the size of the allocation as a whole. Whatever you choose, write it down before depositing and re-balance quarterly to avoid drift turning your target allocation into something very different.
How often should I re-balance my crypto portfolio?
Quarterly re-balancing is the most common cadence and a reasonable starting point — it captures meaningful drift while keeping trading and tax costs manageable. Monthly is too frequent for most portfolios outside crypto-only traders, because the tax friction (in jurisdictions that tax each sale as a realisation event) eats into returns. Annual re-balancing is too infrequent in crypto's volatile environment; a 6-month bull run can drift a 60/40 BTC/ETH portfolio to 30/70 if ETH outperforms sharply, leaving you with much more risk concentration than intended. Some investors use threshold-based re-balancing instead — only re-balance when an allocation drifts more than ±5–10 percentage points from target — which avoids unnecessary trades during calm periods. Whichever approach you choose, document the rule and stick to it; ad-hoc re-balancing tends to become 'sell after losses, hold winners' which is exactly the wrong behaviour.
Why does the calculator only show the Bitcoin amount?
The displayed result focuses on Bitcoin sizing as the most common allocation reference point — BTC is widely treated as the 'safe' crypto anchor that most portfolios are sized relative to. To compute Ethereum and altcoin amounts, re-run the calculator with the ETH or altcoin percentage in the BTC field, or apply the same formula yourself: amount = total × (allocation / 100). For a full allocation breakdown a more sophisticated tool (or simple spreadsheet with three lines) is more convenient. The three percentages should sum to 100% if you are fully crypto-allocated, or to less if you hold cash/stablecoins separately; if your inputs sum to more than 100% the result is meaningless because you are double-counting capital. Always verify the sum before acting on the dollar figures.
What are the common mistakes when allocating a crypto portfolio?
The single biggest mistake is allocating too much of total net worth to crypto in the first place; even a perfectly diversified crypto portfolio can drop 70–80% in a bear market, so allocations beyond what you can lose without changing your life are usually a mistake. The second is confusing 'diversification' with safety — holding 20 altcoins does not diversify away crypto-market risk because altcoins are highly correlated with BTC and ETH during downturns. The third is letting winners drift untouched: a 10% altcoin bucket that 10×'s becomes a 50% altcoin bucket, completely changing the portfolio's risk profile, and most investors fail to trim because trimming feels like 'missing more upside'. People also forget tax consequences — in many jurisdictions every re-balance trade is a taxable event, so frequent re-balancing can quietly trigger a significant tax bill. Finally, chasing the latest narrative (memecoins, AI tokens, real-world assets) by repeatedly tweaking allocations turns a long-term plan into momentum trading, which research consistently shows underperforms disciplined re-balancing.
When should I not use this allocation calculator?
Do not use it to size a single position based on stop-loss distance and risk-per-trade — that is a position-sizing problem (use a position-size or risk-reward calculator) rather than an asset-allocation problem. It is not appropriate for total net-worth allocation; the calculator only divides what you enter, so if you input $20,000 it is silent about whether that represents 5% or 50% of your overall savings, which is the more important number. Do not use it to size positions across many altcoins simultaneously — you need a spreadsheet or portfolio tracker that handles n-asset allocations, not a three-asset BTC/ETH/altcoin split. Do not use it as a rebalancing trigger on its own; pair it with current portfolio values to compute the trades needed to reach the target. And do not treat any specific allocation as 'optimal' — there is no single optimum, and the right allocation for you depends on your risk tolerance, conviction, tax situation, and the rest of your financial picture.