Bitmain Antminer S21 Bitcoin Mining Profitability Simulation 2026

Daily Results at $0.07/kWh

Based on Bitcoin price: $64,000 — Network hashrate — Live data from our API

Daily Revenue

$6.70

0.00010465 BTC

Daily Electricity

$-5.88

3,500 W × 24 h × $0.07

Daily Profit
$0.8177
Marginal

Monthly Profit

$24.53

30-day estimate

$0.080/kWh

Break-even electricity rate

$56,187

Break-even BTC price at $0.07/kWh

3,914 days

Estimated hardware ROI at $0.07/kWh

$298.45

Projected annual profit (constant prices)

Profitability Analysis

The Bitmain Antminer S21 mines Bitcoin profitably below $0.080/kWh. This covers most industrial and low-cost commercial electricity contracts. Miners on residential tariffs above $0.08/kWh should carefully model expected ROI before deploying this hardware.

As a dedicated ASIC, the Bitmain Antminer S21 is permanently optimised for SHA-256 — the algorithm used by Bitcoin and Bitcoin Cash. It cannot be repurposed for other algorithms, so its long-term viability is directly tied to the economics of those specific coins.

At 3,500 watts and an average electricity consumption of 2,520 kWh per month, electricity cost is the single largest variable in profitability. The difference between $0.04/kWh and $0.12/kWh amounts to $201.60 per month in operating margins — which is why electricity rate selection is as important as hardware selection for any serious mining operation.

Profitability at Key Electricity Rates

All figures assume constant Bitcoin price ($64,000.00) and current network difficulty. Actual results will vary as both change over time.

Electricity Rate	Daily Revenue	Daily Elec. Cost	Daily Profit	Monthly Profit	Status
$0.04/kWh	$6.70	$3.36	$3.34	$100.13	Marginal
$0.06/kWh	$6.70	$5.04	$1.66	$49.73	Marginal
$0.08/kWh	$6.70	$6.72	$-0.0223	$-0.6698	Break-Even
$0.10/kWh	$6.70	$8.40	$-1.70	$-51.07	Break-Even
$0.12/kWh	$6.70	$10.08	$-3.38	$-101.47	Unprofitable

Bitmain Antminer S21 — Key Specifications

Manufacturer	Bitmain
Category	ASIC
Algorithm	SHA-256
Hashrate	200 TH/s
Power Draw	3,500 W
Efficiency	17.5 J/TH
Noise	75 dB(A)
Approx. Price	$3,200
Supported Coins	BTC, BCH
Release	2024-Q1

→ Full Bitmain Antminer S21 review, pros & cons, and buying guide

How to Mine Bitcoin with the Bitmain Antminer S21

Acquire and receive the Bitmain Antminer S21
Purchase the Bitmain Antminer S21 from an authorised reseller or reputable secondary market. Budget approximately $3,200. Verify the unit is complete and inspect for physical damage before powering on. The unit ships ready to mine — no assembly required beyond power and network connections.
Connect power and network
Connect the Bitmain Antminer S21 to a dedicated 3500W power supply on a 16 A+ circuit at 220–240 V. Connect an Ethernet cable to your router. Power on the unit and wait 2–3 minutes for it to boot.
Configure your Bitcoin mining pool
Access the miner's web interface by entering its IP address in your browser (find it via your router's DHCP lease list). Navigate to Miner Configuration and enter your chosen pool stratum URL, your Bitcoin wallet address as the worker username, and 'x' as the password. Recommended pools: Foundry USA, F2Pool, AntPool.
Monitor performance and optimise
After starting, confirm your hashrate matches the expected 200 TH/s in the pool dashboard (allow 10–15 minutes for the pool to register your worker). Use our live Bitcoin calculator to track daily earnings against your electricity cost. Consider enabling auto-tune mode or third-party firmware (BOS+ for Antminer units) to improve efficiency 5–10%.

Recommended Bitcoin Mining Pools

Foundry USA stratum+tcp://bitcoin.foundryusapool.com:3333 0% FPPS

F2Pool stratum+tcp://btc.f2pool.com:3333 2.5% FPPS

AntPool stratum+tcp://stratum.antpool.com:3333 2.5% FPPS

Bitmain Antminer S21 vs. Other Bitcoin Miners

Sorted by efficiency. Daily profit calculated at $0.07/kWh.

Hardware	Hashrate	Power	Efficiency	Daily Profit	Approx. Price
Bitmain Antminer S21 XP Hyd	473 TH/s	5,676 W	12 J/TH	$6.30	$12,000
MicroBT Whatsminer M66S	298 TH/s	3,441 W	11.5 J/TH	$4.20	$5,800
Bitmain Antminer S21 XP	270 TH/s	3,245 W	12 J/TH	$3.59	$6,500
Bitmain Antminer S21 Pro	234 TH/s	3,510 W	15 J/TH	$1.94	$4,500
This page Bitmain Antminer S21	200 TH/s	3,500 W	17.5 J/TH	$0.8177	$3,200
MicroBT Whatsminer M60S	186 TH/s	3,441 W	18.5 J/TH	$0.4480	$2,800
Canaan Avalon A1566	185 TH/s	3,430 W	18.5 J/TH	$0.4329	$2,500
Bitmain Antminer S19k Pro	120 TH/s	2,760 W	23 J/TH	$-0.6182	$1,400

Frequently Asked Questions

Is the Bitmain Antminer S21 profitable for Bitcoin mining in 2026?

At $0.07/kWh, the Bitmain Antminer S21 generates approximately $0.8177 per day mining Bitcoin at current prices ($64,000.00/coin). The break-even electricity rate is $0.080/kWh. This hardware is profitable at average industrial electricity rates. Use our live Bitcoin calculator for updated estimates as prices and difficulty change.

What electricity rate does the Bitmain Antminer S21 need to mine Bitcoin profitably?

The Bitmain Antminer S21 breaks even on Bitcoin mining at exactly $0.0797/kWh at current network conditions. At $4 cents/kWh, the daily profit is $3.34; at $8 cents/kWh it is $-0.0223. See the full profitability table on this page for all five electricity tiers.

What is the ROI timeline for the Bitmain Antminer S21 mining Bitcoin?

At a hardware acquisition price of approximately $3,200 and $0.07/kWh electricity, the Bitmain Antminer S21 has an estimated ROI of 3,914 days (130.5 months). ROI calculations assume constant Bitcoin price and network difficulty, both of which fluctuate significantly.

How does the Bitmain Antminer S21 compare to other Bitcoin miners?

The Bitmain Antminer S21 mines Bitcoin at 200 TH/s with 17.5 J/TH efficiency. There are 8 compatible hardware models for Bitcoin in our database. See the comparison table below for a side-by-side efficiency and profitability breakdown of all compatible miners.

Bitmain Antminer S21 Bitcoin Mining Profitability — 2026 Simulation