Bitmain 200 TH/s · 3500 W · 17.5 J/TH · released 2024. BTC price and network hashrate pulled live, electricity at four rates.
Collected 22/10/2026. Sources: Binance (BTCUSDT), mempool.space (hashrate), EIA Monthly Energy Review table 9.8 for the US residential rate. Pool fees and hosting fees are not deducted: this is the ceiling.
The S21 is the reference machine of this site: 200 TH/s at 3500 W, 17.5 J/TH. It draws 84 kWh a day, six times what a flat consumes, and it needs a 220-277 V circuit rated 20 A. Five of them draw 17.5 kW, the size of a small hosted rack.
| Manufacturer | Bitmain |
| Hashrate | 200 TH/s |
| Power on wall | 3,500 W |
| Efficiency | 17.5 J/TH |
| Energy per day | 84.0 kWh |
| Released | 2024 |
| Noise | 75 dB |
Specification as published by the manufacturer: Bitmain, S21 specification sheet. Rated figures carry a tolerance of a few percent on real units.
| Model | J/TH | kWh/day | Gross/day | Net at $0.07 |
|---|---|---|---|---|
| Antminer S21 Pro | 15.0 | 84 | $8.35 | +$2.45 |
| Antminer S21 | 17.5 | 84 | $7.13 | +$1.25 |
| Whatsminer M60S | 18.5 | 83 | $6.63 | +$0.85 |
| Avalon A1466 | 21.5 | 78 | $5.35 | -$0.08 |
| Antminer S19 Pro | 29.5 | 78 | $3.92 | -$1.54 |
| Antminer S19j Pro | 29.5 | 74 | $3.71 | -$1.44 |
| Antminer S19 | 34.0 | 78 | $3.39 | -$2.07 |
Same network, same day, same formula: only the efficiency in joules per terahash changes the bill. Sorted from the most to the least efficient.
At 17.5 J/TH the S21 is efficient by 2024 standards, and it still loses money on US residential power. The machine is not the problem; the kWh price is.
Keep this number: $0.0849/kWh. Above it, one Antminer S21 burns more electricity than the bitcoin it produces, at the current network hashrate. Compare it with your real tariff, taxes and delivery included.
Gross output = (200 TH/s ÷ network hashrate) × 450 BTC a day × bitcoin price. Power = 3500 W × 24 h. Nothing else: no promised BTC rise, no hidden yield. The network mines 144 blocks a day at 3.125 BTC since April 2024.
Two things this cannot predict: difficulty keeps rising (same machine, less output every month) and the BTC price can fall. A worn unit also hashes below its rated figure.
Buying a machine is the visible cost, but the tariff decides the outcome. The alternative is to have the machine run where the kWh is billed at a professional rate: no room, no noise, no upfront hardware.
Referral code to enter by hand before any purchase: CALCULMINAGE, terms and method on the bonus page.
The calculator accepts any hashrate, any efficiency in W/TH and any tariff. The hashrate tiers answer the same question by power level, and the country pages compare residential rates across Europe.
Nothing here is investment advice. Mining is an asset, not a guaranteed yield: difficulty rises, the BTC price can fall, hardware wears out. Commit only what you can lose entirely.