Key takeaways
- Dollar-cost averaging means buying the same amount at regular intervals, for example ISK 10,000 every month, whatever the price.
- When the price is low you get more units for your money, and fewer when it is high, so your purchase price evens out.
- Dollar-cost averaging neither guarantees a profit nor protects against loss. If the price rises steadily, buying everything at once works out better.
- Its main benefit is psychological. You don't have to guess the right moment to buy.
Contents
Dollar-cost averagingDollar-cost averaging (DCA)Buying the same amount at regular intervals, for example monthly, instead of investing everything at once. (DCA) means buying the same amount at regular intervals, for example ISK 10,000 on the first of every month, whatever the price. Instead of trying to hit the right moment, you spread your purchases over a longer period.
The method is old and well known from regular saving in investment funds, where the same amount goes into a fund every month regardless of what the markets are doing. This article explains how it works with CryptocurrencyCryptocurrencyA digital currency secured by cryptography and recorded on a shared ledger, with no bank or government issuing or controlling it., what it does and what it doesn't do.
How does dollar-cost averaging work?
The idea is simple. You decide in advance:
- the amount, for example ISK 10,000
- how often, for example once a month or every two weeks
- what you buy, for example bitcoin
Then you buy according to the plan, whether the price has gone up or down since last time. Because the amount is always the same, you get more units when the price is low and fewer when it is high.
A worked example in krónur
Take an imaginary cryptocurrency we'll call X. You buy ISK 10,000 worth every month for five months. The prices are made up for illustration only, and fees are left out.
| Month | Price of X | Units bought |
|---|---|---|
| 1 | ISK 1,000 | 10 |
| 2 | ISK 800 | 12.5 |
| 3 | ISK 500 | 20 |
| 4 | ISK 800 | 12.5 |
| 5 | ISK 1,000 | 10 |
| Total | 65 |
You have put in ISK 50,000 and own 65 units. Your average purchase price is therefore about ISK 769 per unit (50,000 divided by 65), even though the average price over the five months was ISK 820. At the end of the period, the price is back at ISK 1,000, so your holding is worth ISK 65,000.
If you had spent the whole ISK 50,000 in the first month, you would have got 50 units. They would be worth ISK 50,000 at the end.
The example can also go the other way
In this example the price fell and then recovered, and that is when dollar-cost averaging looks good. If the price had instead risen steadily, from ISK 1,000 to ISK 1,800, you would have ended up with only about 37 units by averaging, against 50 by buying everything at the start.
If the price falls and never recovers, you lose money either way. Dollar-cost averaging doesn't change whether the asset itself goes up or down in value.
Dollar-cost averaging or a lump sum?
A lump sum means investing the whole amount at once. Neither method is always better. The outcome depends on how the price develops, and nobody knows that in advance.
Pros of dollar-cost averaging
- You don't have to pick the right moment. The purchases are decided in advance.
- You are less likely to buy everything just before the price falls, because your purchases are spread over time.
- It fits well with saving from your salary, if you don't have a large sum to start with.
- Saving becomes a habit.
Cons of dollar-cost averaging
- If the price rises during the period, you end up with less than if you had bought everything at once.
- Fixed fees per transaction can add up when you buy small amounts often.
- You have to stick to the plan, even when the price has fallen and everything looks bleak.
- It doesn't reduce the risk of the asset itself. If the cryptocurrency becomes worthless, averaging won't help.
A lump sum has the advantage that all your money is in the asset straight away, with fewer transactions. The downside is that timing then decides everything. If the price falls right after you buy, you feel the full impact.
The psychology of dollar-cost averaging
People who have bought crypto often know two feelings. One is FOMOFOMOThe fear of missing out, which pushes people to buy in a hurry when prices rise fast, often close to the top., the fear of missing out when the price shoots up. The other is fear when the price crashes. Both push people to buy high and sell low.
Dollar-cost averaging takes the decision out of your emotions' hands. You don't have to watch the price every day, and you don't have to regret buying on the "wrong" day. When the price falls, it can even be some comfort to know that your next purchase gets more units for the same money.
But the method also tests your patience. Crypto prices are known for their VolatilityVolatilityHow much and how quickly the price of an asset moves up and down., and the price of bitcoin has repeatedly fallen by more than half within a few months. In a bear marketBear marketA long period when market prices mostly fall and investors are pessimistic. like that, it is tempting to stop. If you stop buying just when the price is lowest, the method loses its point. The same goes for a bull marketBull marketA long period when market prices mostly rise and investors are optimistic., when it is tempting to buy more in the hope of a quick profit.
Dollar-cost averaging often goes hand in hand with HODLHODLCrypto slang for holding on to your crypto for the long term instead of selling when the price swings., the idea of holding for the long term and not letting price swings run your decisions. It is still a good idea to review your plan now and then, for example once a year, so it doesn't become a habit nobody thinks about.
How to do it
- Choose an amount you can afford to lose. It should fit your household budget, even if the price falls a lot.
- Choose a fixed schedule, for example the day after payday.
- Check the fees. If fees are a percentage of the amount, how often you buy makes little difference to the cost. Fixed fees per transaction weigh more heavily the smaller the amount. See What does it cost to buy crypto?
- Record your purchases. Each purchase is a separate transaction at its own price, and you will need that information when you sell. Read about crypto and tax in Iceland.
As of October 2026, Myntkaup doesn't offer automatic recurring purchases. You can still do dollar-cost averaging by hand: deposit by bank transfer and buy the same amount on the same day each month. A reminder on your phone helps you keep the rhythm. ISK bank deposits are free, and each purchase carries a 1.99% SpreadSpreadThe difference between the buying and selling price of the same asset at the same time, often used to charge for crypto trades..
Frequently asked questions
Is it better to buy weekly or monthly?
That matters less than sticking to the plan. Choose a schedule that suits your finances, such as payday, and check whether fixed fees make frequent small purchases expensive.
Does dollar-cost averaging guarantee a profit?
No. It evens out your purchase price, but it has no say in whether the price rises or falls over time. You can lose money with dollar-cost averaging, as with any crypto purchase.
Can I do dollar-cost averaging with several cryptocurrencies?
Yes, but it makes your records more complicated. Also keep in mind that DiversificationDiversificationSpreading your money across different assets so that a fall in one of them has less effect on the whole. across cryptocurrencies doesn't necessarily reduce risk much, because their prices often move in the same direction. Read about why crypto prices are so volatile.
Closing thoughts
Dollar-cost averaging is a simple method: the same amount, at regular intervals, whatever the price. It reduces the influence of timing and emotions, but it doesn't change the risk of the asset itself.
Neither dollar-cost averaging nor a lump sum is always better. What matters most is that the amount fits your finances and that you understand what you are buying. Read about the risks before you start.
