Antminer S21 Pro: specs, earnings and solo odds
The Antminer S21 Pro is the higher-efficiency model of Bitmain's air-cooled S21 generation, launched in March 2024. It is rated at 234 TH/s for 3510 W (15 joules per terahash).
Mining solo at today's difficulty, one Antminer S21 Pro would expect to find a Bitcoin block about once every 82 years: a 1 in 30,000 chance on any given day.
- Hashrate
- 234 TH/s
- Power
- 3510 W
- Efficiency
- 15 J/TH
- Released
- Launched Mar 2024
What it earns a day
At today's difficulty of 140.58T and a block reward of 3.14838303 BTC, one Antminer S21 Pro is expected to earn 10,542 sats a day on average (about $8.48 at a Bitcoin price of $80,408), read 27 Oct 2026 18:08 UTC. Running it uses 84 kWh a day.
| Power price | Electricity | Net a day |
|---|---|---|
| $0.05 per kWh | $4.21 | +$4.26 |
| $0.10 per kWh | $8.42 | +$0.05 |
| $0.15 per kWh | $12.64 | −$4.16 |
An average, not a wage. Solo mining pays this average out as a whole block or nothing: the figure is what the machine earns per day over a very long run, not what arrives each day. The machine's own price is not shown here. Open the calculator to use your own power price.
Checked specs
- Maker
- Bitmain
- Family
- Antminer S21
- Variant
- air-cooled
- Power input
- 220–277 V AC, single-phase (20 A)
- Cooling
- Air
- Noise
- 76 dBA (fans at full speed)
- Released
- Launched Mar 2024
- At the maker
- Maker availability not checked
- Figures
- Figures from the maker's or designer's own pages
| Mode | Hashrate | Power | J/TH |
|---|---|---|---|
| Rated | 234 TH/s | 3510 Wmaker's rating | 15 |
Sources (checked 2026-10-11): Bitmain spec · Release date: Bitcoin Magazine. Image: Bitmain, from its product page. Background evened to white, trimmed, centred and resized by SoloLuck; the machine itself is not edited.
About the Antminer S21 Pro
The S21 Pro is the S21 with more efficient chips: 234 terahashes a second for 3,510 W, against the plain S21's 200 TH/s for 3,500 W. That is about 17% more hashrate for practically the same electricity, 15 joules per terahash instead of 17.5.
It is loud and it is hot. Bitmain rates it at 76 dBA with the fans at full speed, loud enough that a conversation next to it is hard work, and it needs a single-phase 220 to 277 volt supply rated for 20 amps, which in most homes means a dedicated circuit. All 3.5 kW comes back out as heat, every hour it runs.
Solo, one S21 Pro is about as much hashrate as 195 Bitaxe Gammas. The figure at the top of this page is what that buys at today's difficulty, and the earnings table shows what it is expected to make on average against what it costs to run at three power prices. Both move: the difficulty climbs as the network grows, and the price of Bitcoin changes the earnings side every day.
On SoloLuck an S21 Pro mines to its owner's own Bitcoin address with no fee. Use the Lite port like any Antminer, or the Pro port, which starts big machines at a higher share difficulty. If it solves a block, the network pays the whole reward straight to your address.
Mine solo with it on SoloLuck
Point the Antminer S21 Pro at SoloLuck with these three settings in its own web panel or app:
- Pool URL
stratum+tcp://stratum.sololuck.io:4334- Username
- your own Bitcoin address, optionally followed by a dot and a worker name (
bc1q….rig1) - Password
x(anything works)
Port 4334 is the Pro tier, for big ASICs, farms and rented hashrate (Braiins Hashpower) (min & start 1,048,576). Port 3333, the Lite tier the setup wizard uses for every ASIC, works too: its difficulty rises on its own to match the machine.
There is no fee and no account. If it solves a block, the network pays the whole reward straight to your address: SoloLuck never holds it. The setup wizard walks through it step by step.
Where to buy
No shop is linked for the Antminer S21 Pro yet: we add one only after checking that it sells this exact model. The maker's own shop, or a reseller the maker lists, is the safest place to start.
Compare it
Also in the Antminer S21 family: Antminer S21, Antminer S21 XP, Antminer S21e XP Hyd., Antminer S21 XP Hyd., Antminer S21 XP+ Hyd., Antminer S21j XP Hyd., Antminer S21 XP Imm., Antminer S21+ Hyd., Antminer S21 Hyd., Antminer S21 Imm., Antminer S21+, Antminer S21e Hyd.. All hardware, with every model's figures and odds side by side.
How this page is paid for
The mining pool is free. Hardware referrals help support SoloLuck. The pool's fee is 0%, a found block pays the finder in full, and referral links have been on these pages since October 2026.
Links marked Referral link may earn SoloLuck a commission if you buy; links marked Plain link earn nothing. No shop can buy a spec, a place in a table, different odds or a better word from us. Specs come from the makers' and designers' own pages, linked next to each figure. How shops can work with us: Partners.
Quick answers
Can one Antminer S21 Pro find a Bitcoin block on its own?
Yes: every hash is a fresh draw, so any miner can. At today's difficulty one Antminer S21 Pro would expect a block about once every 82 years, a 1 in 30,000 chance on any given day, and most never find one.
How much does the Antminer S21 Pro earn a day?
On average, about $8.48 a day at today's difficulty and Bitcoin price, before electricity. At $0.10 per kWh its power costs $8.42 a day, so it nets +$0.05. Solo mining pays that average as a whole block or nothing.
How do I solo mine with a Antminer S21 Pro?
Set the pool URL to stratum+tcp://stratum.sololuck.io:4334, the username to your own Bitcoin address (a dot and a worker name are optional) and the password to anything. SoloLuck charges no fee, and a block it finds pays the whole reward straight to your address.
How much power does the Antminer S21 Pro use?
3510 W, by the figures linked on this page.