How Many Sats Do I Need to Retire? How Much Bitcoin Is Enough

Short answer: How much bitcoin you need for retirement depends on three numbers: your monthly pension gap, the year you retire and the bitcoin price then. At a 4% withdrawal per year, you need 300 times your monthly gap in bitcoin. For a €1’000 gap from 2046, according to the Power Law model, that is about 10.7 to 11.5 million sats.

Why "one bitcoin is enough" is not an answer

You have been saving in bitcoin for years and wonder: will it be enough for retirement one day? Online you hear "one whole bitcoin is enough" or "with 0.1 BTC you're set". Both are guesses. Whether your sats are enough depends on how much money you will be short in old age and when you need it.

The good news: the calculation is simple. You need three numbers you already know or can estimate today, and a price for which this site has a model. At the end there is a number in sats that you compare with your holdings.

Step 1: your pension gap

In old age you don't have to pay all your expenses from bitcoin. Part comes from the state pension, part perhaps from an occupational pension, rental income or other assets. Bitcoin only has to fill the gap.

This is how you find it:

1. Estimate your expenses in old age: Take your current expenses and remove what will no longer apply, such as savings installments or the paid-off mortgage. Many people end up at 70 to 80% of their current net income.
2. Read off your secured income: In Germany, your expected pension is in the annual Renteninformation (pension statement) from the Deutsche Rentenversicherung. In Switzerland, you get a pension projection from your AHV compensation office (the state old-age insurance) and the benefits statement from your Pensionskasse (occupational pension fund). In Austria, your Pensionskonto (pension account) shows where you stand.
3. Subtract: Expenses minus secured income is your monthly gap, in today's money.

Mind the taxes: in Germany and Austria, the state pension is partly taxed. Calculate with what actually arrives net.

Step 2: how much wealth covers the gap?

The monthly gap becomes a target wealth. To get there, you assume how much you withdraw each year. The best-known assumption is the 4% rule: each year you sell 4% of the value of your wealth.

That gives a simple rule of thumb: target wealth = annual gap × 25, or monthly gap × 300.

The figures are in today's money. Prices will rise until you retire. At 2% inflation a year, the ECB's target, €12’000 today becomes about €14’400 in 2036 and €17’500 in 2046. We factor that in below.

The 4% comes from studies with US stocks and bonds. Bitcoin swings more. Why 4% is still a usable assumption and where the limit lies is explained further down.

Step 3: how much bitcoin to retire? The calculation in sats

Now divide the target wealth by the bitcoin price when you retire. No one knows that price. This site's Power Law model gives you two guide lines:

• The trend is the long-term middle path around which the price has swung since 2010.
• The floor is the model's lower line, at 42 % of the Power Law line. Bitcoin has been below it on fewer than 4% of all days so far.

Calculating with the trend tells you how many sats you need if things go normally. Calculating with the floor tells you how many you need if you happen to retire at the bottom.

The table: sats per €1’000 monthly gap

For each €1’000 of monthly gap in today's money, you need this much bitcoin depending on when you retire. Inflation of 2% a year until retirement is included; the withdrawal is 4%.

Data and exchange rate as of Nov 13, 2026, €1 = $1.106. Source: model values from /power-law/btc-daily.csv and the methodology.

100 million sats are one bitcoin, so 23.7 million sats are 0.237 BTC. In the model, the trend price is about €0.8 million in 2036 and about €4.1 million in 2046; the floor about €0.6 million and €3.8 million. If you retire today, you would need 3.05 BTC at the trend and 4.94 BTC at the floor.

For a €500 gap, halve the figures; for €2’000, double them. For a CHF 1’000 gap you need about 8% more bitcoin than for €1’000, because at today's rate a franc is worth more than a euro. For 2036, that is 0.515 BTC at the trend and 0.612 BTC at the floor.

The table shows why the answer depends so much on the date. In the model, the bitcoin price grows faster than inflation, so you need fewer sats for a later retirement. That is an assumption, not a promise. How the model is built and where its limits lie is explained in the article Bitcoin Power Law.

Two examples from Germany and Switzerland

Both examples calculate cautiously: every installment buys at the trend price. If the price is below it, as it is today, you get more sats for the same money. The prices are calculated with the exchange rate of Nov 13, 2026.

Why 4% can work with bitcoin and where the limit lies

The 4% rule goes back to William Bengen. In 1994, using US data, he showed that a portfolio of stocks and bonds would have sustained a withdrawal of 4% in the first year, adjusted for inflation thereafter, for at least 30 years.

With bitcoin, the situation is different, in both directions:

• In the model, the price grows faster than you withdraw. The trend rises by about 21% a year in 2036 and about 16% in 2046. That is more than a 4% withdrawal plus 2% inflation. Your holdings of bitcoin shrink, but their value in the model doesn't.
• The swings are much larger. Since 2013, bitcoin has fallen by 53 to 85% four times. If you withdraw 4% of the value in such a year, you only get half or less. If you withdraw the fixed amount instead, you sell twice as many sats as planned.

That is exactly why this site's retirement calculator works with the floor: it checks from when 4% of your holdings at the floor price cover your expenses. Then your pension holds up even at the bottom. How fixed amounts, a floor rule and a buffer perform with real prices is shown in the comparison The 4% rule with bitcoin.

A third option is to borrow against bitcoin instead of selling. That has its own risks, above all forced liquidation if the price falls. What it costs and how much borrowing survives a bear market is shown in the article Borrowing against bitcoin instead of selling.

Calculate your own number

The "Retire on bitcoin" calculator answers the question from the other side: you enter your holdings, your expenses and your savings rate. It shows from which year the floor covers your expenses and from when it is enough at fair value. You can adjust inflation and withdrawal rate under "More".

If you want a range instead of two lines, the Monte Carlo calculator plays through thousands of possible price paths. How many sats you get for an amount today is shown by the sats calculator.

Don't forget taxes and inflation

The figures above are before taxes. What is due when you sell in old age depends on the country (as of 2026):

• Germany: Gains on bitcoin you have held for more than a year are tax-free. A draft bill from the Finance Ministry would change that for future purchases, but it is not law. Details in Bitcoin taxes in Germany.
• Austria: Gains on bitcoin bought from March 2021 are taxed at 27.5%, regardless of the holding period. Plan your withdrawal correspondingly higher there.
• Switzerland: Price gains on private assets are usually tax-free. But your bitcoin holdings count as wealth and are subject to wealth tax.

Inflation is already in the table. If you assume more than 2%, you need somewhat more sats. Why money in the bank loses so much purchasing power over decades is shown in Inflation and loss of purchasing power.

How to put your retirement goal into practice

1. Get your pension statement or pension projection and write down your monthly gap.
2. Read off your number in sats from the table above, for trend and floor.
3. Compare it with your holdings and work out the required savings rate with the retirement calculator.
4. Set up a savings plan you can stick with even in a bear market. Which providers exist is shown in the bitcoin savings plan comparison.
5. Record your goal: on My Goal you enter your holdings, target amount and selling rules.

Retirement is one goal among several. How to combine all your goals with amount, date and rules into one plan is explained in the guide Setting and planning your bitcoin goal. If you plan as a couple, Talking to your partner and family about bitcoin helps. You can continue in the Plan & live section of the academy.