What the halving actually does.
Every four years, the amount of new Bitcoin created is cut in half. It’s the most talked-about event in crypto — and the most misunderstood. Here’s the mechanism, the history, and what it doesn’t do.
New supply, cut in half
Bitcoin has no central bank. New coins are created only as a reward to the miners who secure the network, roughly every ten minutes — about 144 blocks a day. The size of that reward is fixed in the code, and every 210,000 blocks (roughly four years) it halves.
Because the reward keeps halving, the total supply can never pass 21 million. More than 95% of it already exists. Today the network adds about 450 new BTC a day — around 164,000 a year, or under 1% of the supply. That’s a lower inflation rate than gold.
Why it can move the price
Miners have bills — electricity, machines, staff — and many of them sell a large share of the coins they earn. That selling is new supply the market has to absorb every single day. A halving cuts it in half overnight, while demand doesn’t change at all.
Before April 2024: 900 new BTC a day. At roughly $64,000 per coin, that’s about $57.6 million of new supply every day.
After April 2024: 450 BTC a day — about $28.8 million. If buyers keep turning up at the same rate, there’s roughly $29 million less being sold into them every day. Over a year, that’s more than $10 billion of selling that simply stops existing.
New supply calculator
Pick an era and a Bitcoin price to see how much new supply the market has to absorb.
Based on 144 blocks a day. Real output varies slightly with how fast blocks are found.
What happened after each halving
So far, every halving has been followed by a new all-time high — usually 12 to 18 months later. But look at the last column.
| Halving | Price then | Cycle peak | Months later | Multiple |
|---|---|---|---|---|
| Nov 2012 | ~$12 | ~$1,150 · Dec 2013 | ~12 | ~95× |
| Jul 2016 | ~$650 | ~$19,700 · Dec 2017 | ~17 | ~30× |
| May 2020 | ~$8,600 | ~$69,000 · Nov 2021 | ~18 | ~8× |
| Apr 2024 | ~$64,000 | ~$126,000 · Oct 2025 | ~18 | ~2× |
The returns shrink every cycle. 95×, then 30×, then 8×, then about 2×. Each halving removes a smaller share of a much bigger market, and more of the demand now comes from large, slower-moving money like ETFs. Anyone selling you “the halving always does 10×” hasn’t looked at the table.
What the halving doesn’t do
- It doesn’t create demand. It only reduces new supply. If buyers disappear, price can still fall.
- It isn’t the start of the move. In recent cycles, much of the run happened before and well after the halving date. I treat it as fuel and confirmation, not a starting gun.
- It doesn’t time the top for you. The 12–18 month pattern is a guide built on four examples. That’s why I watch several signals together on the Cycle Indicator.
The halving makes new Bitcoin scarcer on a fixed schedule. It sets the rhythm of the four-year cycle — but demand decides the price, and each cycle’s gains have been smaller than the last.
Education only — not financial advice. Prices are approximate and historical. Cryptoassets are high-risk and largely unregulated in the UK; you could lose all the money you invest. Past performance does not guarantee future results.