Antminer S21 profitability
The original S21 does 200 TH/s at 3,500 W, which is 17.5 J/TH. It is the baseline for the S21 family, and a useful yardstick for how much the Pro and XP versions improved.
- Hashrate: 200 TH/s
- Power: 3,500 W
- Efficiency: 17.5 J/TH
- Source: Bitmain spec sheet, accessed October 21, 2026.
Daily profit by power price
At the hashprice below, one Antminer S21 grosses about $7.62 a day. At $0.05/kWh it nets about $3.42 a day, and it breaks even at about $0.091/kWh.
| Power price | Revenue / day | Power / day | Profit / day | Profit / 30 days |
|---|---|---|---|---|
| $0.03 | $7.62 | $2.52 | $5.10 | $153 |
| $0.04 | $7.62 | $3.36 | $4.26 | $128 |
| $0.05 | $7.62 | $4.20 | $3.42 | $102 |
| $0.06 | $7.62 | $5.04 | $2.58 | $77 |
| $0.07 | $7.62 | $5.88 | $1.74 | $52 |
| $0.08 | $7.62 | $6.72 | $0.90 | $27 |
| $0.09 | $7.62 | $7.56 | $0.06 | $2 |
| $0.10 | $7.62 | $8.40 | -$0.78 | -$24 |
Hashprice $0.0381 per TH/s per day, computed October 21, 2026 at 19:27 UTC from the mempool.space API: BTC $84,714, difficulty 140.58 T, average reward 3.1415 BTC per block over the last 144 blocks. Revenue is gross: no pool fee, downtime, hosting markup or hardware cost. Assumes the machine runs at spec 24 hours a day (our assumption). Figures update when the site is rebuilt.
Open the ASIC calculator
Wondering whether the same kilowatts would earn more renting GPUs? Try the mine vs AI per-kW calculator. Other models: Antminer S21 XP · Antminer S21 Pro · Antminer S19 XP · Antminer S19k Pro, or see all ASICs.