Bar chart showing how an 80% crypto crash affects a total portfolio at 1%, 5%, 10% and 20% allocations
"How much should I invest in crypto?" is probably the most common question beginners ask, and nobody can answer it for you with a single number. Anyone who gives you one without knowing your finances is guessing.
What can be explained is how to think about it: which money is off-limits, how to measure the damage of a bad outcome before you invest, and a simple position-sizing formula that limits how much you can lose on one trade. Every example below is calculated so you can check it.
Last updated: November 2026.
Start With the Money You Should Not Invest
Before deciding how much to put in, rule out money that should never be at risk:
- Money for essentials: rent, food, bills and anything you must pay in the next months.
- Your emergency fund: many people aim for several months of expenses in safe, easy-to-access savings. Check what is reasonable for your situation.
- Money for near-term goals: a tuition payment, a house deposit or anything you will need soon, because crypto can fall sharply right before you need it.
- Borrowed money: never invest with credit cards or loans.
- Money you are paying high interest on: paying down expensive debt is often a better use than a risky investment.
What is left over, money you could lose without it changing your life, is the only part that belongs in crypto.
Test the Damage Before You Invest
Crypto can fall 50% or more, and some coins have fallen 80% or more in bad periods. A useful exercise is to calculate what such a drop would do to your whole portfolio, not just to the crypto part. Imagine a total portfolio of $10,000 and four possible shares in crypto:
| Share in crypto | Amount in crypto | Loss if crypto falls 50% | Hit to total portfolio | Loss if crypto falls 80% | Hit to total portfolio |
|---|---|---|---|---|---|
| 1% | $100 | $50 | 0.5% | $80 | 0.8% |
| 5% | $500 | $250 | 2.5% | $400 | 4.0% |
| 10% | $1,000 | $500 | 5.0% | $800 | 8.0% |
| 20% | $2,000 | $1,000 | 10.0% | $1,600 | 16.0% |
With 5% of the portfolio in crypto, even an 80% crash costs 4% of everything you own. With 20% in crypto, the same crash costs 16%. The question to ask yourself is not "how much can I make?", it is "how bad a loss could I accept, financially and emotionally, without panicking or changing my life?" Work backward from that number.
Ways People Decide an Amount
- A fixed share of the portfolio. You choose a percentage of your total investable assets for high-risk assets like crypto, and keep it there. Many people choose a small share, but the right one is personal.
- A fixed monthly amount. You decide a sum you can invest every month without affecting your budget, and invest it through DCA. This is the easiest way to start and avoid big one-time bets.
- A maximum loss budget. You decide the most you would accept losing in total and size your investment so that even a severe drop stays within it.
These can be combined. What matters is that you decide the rule before you buy, when you are calm, and not during a rally or a crash.
Position Sizing: Limit the Loss on Each Trade
If you trade actively, or want to cap the damage from any one coin, you can use the fixed-risk method:
Position size = amount you accept to lose ÷ distance to your exit price (as a percentage)
Suppose your trading account is $5,000 and you accept losing at most 1% of it on one trade, which is $50.
| Distance from entry to your exit (stop) price | Position size | Loss if the exit is hit |
|---|---|---|
| 5% | $1,000 | $50 |
| 10% | $500 | $50 |
| 20% | $250 | $50 |
Worked example: you want to buy a coin at $100 and decide that if it falls to $90 you will sell. That exit is 10% below your entry. Your position is $50 ÷ 10% = $500, or 5 units. If the price hits $90, you lose 5 × $10 = $50, exactly the 1% you accepted.
Notice that a tighter exit allows a bigger position and a wider exit forces a smaller one. The method does not tell you what to buy, only how to keep a single mistake from hurting too much.
Limits of this method: in fast or illiquid markets, the price can jump past your exit and the actual loss can be larger than planned. Fees and slippage also add to the loss. Treat the formula as a guide, not a guarantee, and keep position sizes moderate.
Diversifying Within Crypto
Splitting your crypto money among several coins can reduce the damage if one fails, but it does not remove the risk that the whole market falls together, which often happens. Be careful with very small, unknown coins: they can go to zero. Many people keep most of their crypto in larger, established assets and treat small speculative coins as a tiny part, if at all.
Common Mistakes
- Investing because of fear of missing out. A sudden rally is not a reason to put in more than you planned.
- Using money you need soon. A drop right before you need the funds forces you to sell at a loss.
- Borrowing to invest. Losses can exceed what you put in, and the debt remains.
- Adding more to a losing position to "get even". That is how a small mistake becomes a large one.
- Not deciding the amount in advance. Without a rule, emotions decide.
- Forgetting fees and taxes. They reduce your result and need to be planned for.
Key Takeaways
- Nobody can give you the right amount without knowing your finances. Work it out from your own situation.
- Never invest money you need for essentials, emergencies, near-term goals or that is borrowed.
- Test the damage: what would a 50% or 80% drop do to your total portfolio?
- A fixed share, a fixed monthly amount or a maximum loss budget are all ways to set a limit before you buy.
- For trades, size the position from the loss you accept and the distance to your exit.
Frequently Asked Questions
How much of my money should be in crypto?
There is no universal answer. A common approach is to keep it to a share you could lose completely without hurting your financial security, and to decide that share in advance. A qualified financial professional can help you with your own numbers.
Is it better to start small?
Often yes. Starting with a small amount lets you learn how exchanges, wallets, fees and price swings work with limited risk. You can increase later if you want to and can afford to.
Should I invest a lump sum or spread it over time?
Both have trade-offs. Spreading purchases over time reduces the risk of one badly timed purchase. You can plan regular purchases with our free DCA Calculator.
How can I measure my result?
Our Crypto Profit Calculator shows the gain or loss of a trade, including fees, so you can see how a position really performed.
Educational content only, not financial, tax or legal advice, and not a recommendation to invest any particular amount. The percentages and amounts above are made-up illustrations to show how the math works, not suggested allocations. Crypto is volatile and you can lose some or all of the money you put in. Your right amount depends on your income, expenses, debts, goals and ability to take losses, so consider speaking with a qualified financial professional.
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