The Bitcoin Float
Of the 21 million bitcoin that will ever exist, most is already locked away — by long-term holders, ETFs, governments, companies, or lost forever. The Reservoir below shows what's still in play. Mining drips new bitcoin in slowly. Demand drains it out faster. The level keeps falling.
The Float Over Time
Available supply, trending down · halving events marked
The Halving Runway
Demand is already 6.0× the new supply. And it doubles on a known schedule.
Next halving in 701 days. Daily new supply drops from 450 BTC → 225BTC. If today's absorption pace holds, the ratio doubles overnight.
*Holding demand constant is a thought experiment, not a forecast — see Methodology.
Where it all lives
21 million bitcoin, accounted for. The orange is what's left to buy.
Methodology & Sources
Hero number uses the strict definition: mined supply minus provably illiquid cohorts (lost + governments + ETFs + public companies). The "expanded scarcity" framings (LTH-included and exchange-only) appear above as supporting context, never as the headline.
| Metric | Source | Last reviewed |
|---|---|---|
| Mined / circulating supply | mempool.space (block height) | live |
| Government holdings | bitcointreasuries.net | daily snapshot |
| Spot Bitcoin ETF AUM | bitcointreasuries.net (aggregate) | daily snapshot |
| Public-company treasuries | bitcointreasuries.net (aggregate) | daily snapshot |
| Provably lost (>7y dormant) | Glassnode (lth-supply-7y derived) | 2026-05-11 |
| Long-term holder baseline | Glassnode lth-supply | 2026-05-11 |
| Exchange reserves | CoinGlass /Balance | 2026-05-11 |
Last data refresh: Tue, 12 May 2026 15:45:18 GMT. Slow-moving cohorts (lost, LTH baseline, exchange reserves) are reviewed quarterly and updated in src/lib/float-snapshot.ts.
Tell someone how much bitcoin is actually left
Opens your share sheet (or X compose) with a pre-filled message. Recipients see a live preview card with today's float number — the snapshot auto-updates when the data moves.