Blog · 29 Oct 2026 · By BitcoinSaving

What $100 became in 10 years

A comparison shared on X by @TheCryptomath put one $100 bill into four places for ten years and read out what was left. The four answers are not close.

The fifth lane: buying a little, regularly

Almost nobody actually invests like lane four. One lump, one day, then a decade of doing nothing while the price swings 80 percent down more than once. The version people can actually stick to is smaller and duller: the same amount, on a schedule. We recomputed two of those lanes on the same daily price history our calculator uses (Coinbase daily prices, via btcdollarcostaverage.com):

The interesting part is not the totals. It is the average cost: $3,689 and $3,635, against a price that spent most of 2021 above $50,000. A schedule buys the boring months too, including the ones where the price had fallen 70 percent and buying felt pointless. Those months are where most of the stack quietly came from.

One $20 buy, two very different Novembers

The fifth lane runs on one dull mechanic: the same dollars buy more bitcoin when the price is low. One real pair of buys shows how wide that gap gets. A single $20 buy at the November 2021 peak stacked 29,606 sats. The same $20, spent a year later near the November 2022 bottom, stacked 126,904 sats. Same money, 4.3 times as much bitcoin, bought on the kind of day when most people had stopped looking at the price at all.

No schedule picks those two days on purpose. It simply keeps showing up on both kinds of day, the euphoric ones and the miserable ones. That is why the weekly lane's average cost in the table above, $3,689, sits so far below the prices that made headlines in between: the stack was built disproportionately in the cheap months, because cheap months are when a fixed $20 stretches furthest.

Split the $100 four ways

One bill in one place is a thought experiment; real savers split their money. Put $25 into each of the four lanes above and the same decade ends like this:

That is the honest tension in this data. Spreading money across the first three lanes changed the outcome by tens of dollars. The fourth lane changed it by thousands, in a decade when Bitcoin went from a fringe experiment to a mainstream asset. It cannot repeat that journey from today's starting point in the same way, and any honest reading of the table has to hold both halves of that sentence at once.

Questions this comparison raises

So will $100 in Bitcoin today be worth $9,256 in ten years?

Nothing here says that. The $9,256 is one measured decade, starting when Bitcoin was small and ending after two full bull markets. The next decade starts from a much larger base, and Bitcoin's history also includes falls of more than 80 percent that took years to recover from. Read the number as a record of what happened, not as a rate you can apply forward.

Why is the cash lane only worth $72?

The bill itself still says $100. The $72 is buying power: prices in the US rose by roughly 39 percent across the decade, so an untouched $100 in 2026 buys about what $72 bought in 2016. The cash did not shrink on the table. It shrank at the checkout, quietly, which is exactly how inflation does its work on people who never invest at all.

What did the fifth lane cost, in total?

More than $100, and that is rather the point of it. Twenty dollars a week since January 2016 adds up to $11,300 across 565 weekly buys. Almost nobody has a spare fortune sitting in a drawer, but a lot of people can find $20 in a weekly budget. The fifth lane trades the single perfect start date for a habit, and the habit is what produced the 3.06 BTC in the table above.

What this does not say

Start dates do heavy lifting in every one of these numbers, including ours. The same weekly plan started at the November 2021 top looks ordinary for years. Bitcoin's past includes falls of more than 80 percent, and a plan only works if it is small enough to keep running through them. This is past data and arithmetic, not a forecast and not financial advice.

Related stories

Run your own numbersHow the calculator works