WhatsMiner M66S profitability
The M66S is an immersion-cooled MicroBT unit, listed at 290 TH/s and 18.5 J/TH, so about 5,365 W per machine. Same efficiency as the M60S, just more hashrate per box, which needs an immersion setup.
- Hashrate: 290 TH/s
- Power: 5,365 W
- Efficiency: 18.5 J/TH
- Source: MicroBT WhatsMiner shop listing, accessed October 21, 2026. The shop lists hashrate and J/TH; the wattage is our arithmetic (TH/s × J/TH).
Daily profit by power price
At the hashprice below, one WhatsMiner M66S grosses about $11.04 a day. At $0.05/kWh it nets about $4.61 a day, and it breaks even at about $0.086/kWh.
| Power price | Revenue / day | Power / day | Profit / day | Profit / 30 days |
|---|---|---|---|---|
| $0.03 | $11.04 | $3.86 | $7.18 | $215 |
| $0.04 | $11.04 | $5.15 | $5.89 | $177 |
| $0.05 | $11.04 | $6.44 | $4.61 | $138 |
| $0.06 | $11.04 | $7.73 | $3.32 | $100 |
| $0.07 | $11.04 | $9.01 | $2.03 | $61 |
| $0.08 | $11.04 | $10.30 | $0.74 | $22 |
| $0.09 | $11.04 | $11.59 | -$0.54 | -$16 |
| $0.10 | $11.04 | $12.88 | -$1.83 | -$55 |
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 S21 · Antminer S19 XP, or see all ASICs.