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Yes, you can buy part of a bitcoin. One bitcoin is divided into 100 million smaller units called satoshis, often shortened to “sats”, and you can buy, hold and send any whole number of them. Most exchanges in the EU let you buy bitcoin for a few euros, and your account then simply shows a balance such as 0.00012 BTC.
So the price of one whole bitcoin says nothing about whether you can afford to own some. What matters is how much you are willing to put at risk, and that the platform, fees and storage make sense for that amount. This guide explains how satoshis work and what to watch out for when you deal in small amounts.
What is a satoshi?
A satoshi is the smallest unit of bitcoin that the Bitcoin network records on its main chain:
- 1 bitcoin (BTC) = 100,000,000 satoshis
- 1 satoshi = 0.00000001 BTC (eight decimal places)
The unit is named after Satoshi Nakamoto, the still-unknown person or group who published the Bitcoin white paper in 2008 and launched the network in January 2009. The nickname for the unit was adopted by the community in Bitcoin’s early years; it is not an official currency like the euro cent, but every wallet and exchange understands it.
Under the hood, the Bitcoin software does not work with “0.5 BTC” at all. It stores every amount as a whole number of satoshis. “Bitcoin” is just a convenient way of writing 100 million of them.
Other units you may see
| Unit | In BTC | In satoshis |
|---|---|---|
| Bitcoin (BTC) | 1 | 100,000,000 |
| Millibitcoin (mBTC) | 0.001 | 100,000 |
| Bit or microbitcoin (μBTC) | 0.000001 | 100 |
| Satoshi (sat) | 0.00000001 | 1 |
On the Lightning Network, a payment network built on top of Bitcoin, amounts are tracked even more finely, in thousandths of a satoshi. Those fractions only exist inside Lightning; when funds return to the main chain they are rounded to whole satoshis.
How many satoshis can there ever be?
Bitcoin’s supply is capped at just under 21 million BTC, which works out to roughly 2.1 quadrillion satoshis. New bitcoin enters circulation only as a reward to miners, and that reward halves about every four years, as our guide on how Bitcoin works explains. The cap is one reason why the price of a single bitcoin is high, and why most people own fractions rather than whole coins.
What does a satoshi cost in euros?
That depends entirely on the bitcoin price at the moment you look, which changes every second. The maths is simple, though. Divide the price of one bitcoin by 100 million.
A worked example with a hypothetical price of €100,000 per bitcoin:
- 1 satoshi = €100,000 ÷ 100,000,000 = €0.001 (a tenth of a cent)
- €10 buys about 10,000 sats (0.0001 BTC), before fees
- €100 buys about 100,000 sats (0.001 BTC), before fees
If the price is lower or higher, the number of sats you get moves the other way. That is all a satoshi price is; it is not a forecast and does not make bitcoin “cheap” or “expensive”.
The “whole coin” trap: why price per coin is misleading
Many beginners feel that a coin costing a few cents has more room to grow than one costing tens of thousands of euros. Psychologists call this unit bias, and scammers love it. A coin’s price per unit tells you nothing on its own, because each project creates a different number of units. A token at €0.01 with hundreds of billions in circulation can be valued far higher in total than you would guess.
If someone pitches a “cheap alternative to Bitcoin that could be the next 1,000x”, treat it as a warning sign. Promised or implied returns are a classic feature of fraud, as our guide on spotting crypto scams shows.
How buying a small amount of bitcoin works in practice
1. Choose a licensed provider
In the European Union, companies that let you buy, sell or store crypto-assets need an authorisation under MiCA as a crypto-asset service provider. Since 1 July 2026 the transitional period for unlicensed providers has ended across the EU. Before you sign up anywhere, follow our steps on how to check whether a crypto exchange is licensed and look up the provider’s exact legal name in the ESMA or national register.
2. Enter an amount in euros
Almost every app lets you type a euro amount and calculates the bitcoin for you. Minimum purchases differ per provider; some start at one or a few euros, others higher. The app shows the bitcoin amount you will receive, usually with all eight decimal places.
3. Look at the total cost, not just the price
Small amounts are where fees hurt most. Look for:
- Trading or service fees, often a percentage of the purchase, sometimes with a fixed minimum.
- The spread: the gap between the buy and sell price shown in “simple buy” screens, which can be larger than the stated fee.
- Deposit fees for some payment methods, such as cards.
- Withdrawal fees if you later move your bitcoin to your own wallet. These are often a fixed amount, which can be a large share of a small balance.
A fixed fee of a euro or two barely matters on €1,000 but is significant on €10. Licensed providers have to disclose their costs, so read the fee page before you buy.
4. Recurring purchases
Many platforms offer a savings plan that buys a fixed euro amount every week or month. Spreading purchases over time means you do not buy everything at one price, but it does not protect you from losses: if the price falls and stays low, a savings plan loses money too. Check the fee per purchase, because a small fee repeated every week adds up.
Sending and storing small amounts of bitcoin
Network fees are paid per byte, not per euro
When you send bitcoin on the main chain, you pay a network fee that depends on the size of the transaction in data (measured in “virtual bytes”, with fee rates shown in sats per vbyte) and on how busy the network is. The fee does not depend on the amount you send. Sending 5,000 sats can cost the same as sending 5 BTC, so very small transfers can be uneconomical when the network is busy.
Dust
Bitcoin nodes do not relay outputs that are so small that they would cost more to spend than they are worth. These tiny amounts are called dust. With the default settings of the widely used Bitcoin Core software, the limit is a few hundred satoshis, depending on the address type. In practice, exchanges set their own minimum withdrawal amounts well above this, so you will rarely run into the technical limit yourself. The lesson for beginners: many small deposits to your own wallet can be more expensive to move later than one larger transfer.
Where to keep small amounts
For a few euros’ worth of bitcoin, a hardware wallet may cost more than what you are protecting. Many beginners start on a licensed exchange or with a reputable software wallet, and move to self-custody once the amount would hurt to lose. Whatever you choose:
- If you use a self-custody wallet, write down the recovery phrase on paper and never share it with anyone.
- Double-check addresses and send a small test amount first.
- Remember that coins on an exchange are not covered by a deposit guarantee scheme.
When your balance grows, our step-by-step guide on moving crypto from an exchange to a hardware wallet shows how to do the first transfer safely, and our guide to choosing a hardware wallet explains what to look for in a device.
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Do small amounts of bitcoin matter for tax?
Yes. Tax rules do not have a minimum just because you own a fraction of a coin. In the Netherlands, crypto counts towards your wealth in Box 3 based on its value on 1 January, together with your other assets; the tax-free allowance applies to the total, not per asset. Our guide to crypto taxes in the Netherlands explains the details. In many other EU countries, selling bitcoin, swapping it for another crypto-asset or paying with it can be a taxable event, even for small amounts. Keep your purchase records and statements.
Since 2026, EU crypto providers also collect information on their customers’ transactions for tax authorities under the DAC8 rules, so small trades are recorded too.
Common beginner questions
What is the smallest amount of bitcoin I can buy?
Technically one satoshi, but in practice the provider’s minimum order decides, and that is usually a euro amount. Check the minimum and the fees together.
Is it worth buying a small amount of bitcoin?
Nobody can tell you that, and nobody can predict bitcoin’s price. Owning a fraction carries exactly the same risks per euro as owning a whole coin: the price can fall sharply and you can lose all the money you put in. Only use money you can afford to lose.
Is 0.001 BTC the same as 100,000 sats?
Yes. 0.001 × 100,000,000 = 100,000 satoshis.
Can I send a few satoshis to a friend?
On the main chain, very small amounts are often uneconomical because of network fees and dust limits. Wallets that support the Lightning Network can send small amounts more cheaply, but Lightning has its own learning curve and risks.
In short
You never need to buy a whole bitcoin. Bitcoin is divided into 100 million satoshis, and you can buy whatever amount you choose on a licensed EU platform. For small amounts, the real questions are practical: what the fees and minimums are, whether moving the coins to your own wallet makes sense yet, and how you will keep records for tax. And the most important one: a fraction of a bitcoin is still a highly volatile, risky asset.
Sources: Bitcoin white paper (Satoshi Nakamoto, 2008); Bitcoin Core documentation on amounts, fee rates and dust relay policy; Bitcoin developer documentation on the 21 million supply cap; Regulation (EU) 2023/1114 (MiCA) and ESMA statements on the end of the transitional period; Belastingdienst information on Box 3 and DAC8. Information as of October 2026. Not financial or tax advice.