If you are pricing a Antminer S21, start here: the Antminer S21 resale value is $985 as of October 30, 2026. It rests on 11 real sales, not asking prices.
Over the last 90 days the price is flat on the 90 days before, so the price has barely moved. Also, we rebuild this page every day from the ING sold-comps data.
Antminer S21 resale value: the numbers
| Window | Sales (n) | Median | Middle half | Low to high |
|---|---|---|---|---|
| Last 90 days | 11 | $985 | $822 to $994 | $700 to $1,050 |
| Previous 90 days | 24 | $1,000 | $908 to $1,099 | $730 to $1,495 |
Every window covers machines sold as pre-owned. First, we remove price outliers. Then we take medians, because one odd sale can wreck an average. Per TH/s that works out to about $4.88. Shipping is not in these prices. When the buyer paid it, the median charge was $34, and 17% of sales shipped free.
What is driving the Antminer S21 price
The 90-day median is flat on the window before it. We would not read much into that, because the move is small. However, we cannot see why each buyer paid what they paid. Instead, we see the price that cleared.
Used, refurbished or new: what each fetches
Condition changes the price, so we keep it apart. Used: $985 on 11 sales. New or open box: $31 on 8 sales. We use 90 days unless a grade has too few sales, and then we widen to 180 or 365 days. Also, always check the grade before you compare two quotes.
Mining maths for the Antminer S21
Hashprice is $33.61 per petahash per day today. At the rated 200 TH/s and 3,500 W, the Antminer S21 grosses $6.72 a day before power. As a result, its break-even power price is 8.0 cents per kWh.
| Power price | Profit per day | Payback on $985 |
|---|---|---|
| 5 cents | $2.52 | 390 days |
| 8 cents | $0.00 | 338818 days |
| 12 cents | -$3.36 | never |
Our fair value is a year of profit at 5 cents with hashprice held flat. For the Antminer S21 that comes to $921. The sold price is 107% of one year of cheap-power profit. That is in line with the mining maths. However, hashprice moves every block, so this verdict can flip. Also, it ignores pool fees, hosting and difficulty growth.
Buying or selling an Antminer S21
Use these numbers as a check on any quote. First, if you want to sell, start on our we buy used miners page. It takes a description and gives you an offer. Next, try the free What is my miner worth? tool. To buy instead, see the Antminer S range or browse all used ASIC miners. Also, every model we track appears on the used ASIC miner prices by model page, and the full table is in the ING Used ASIC Miner Price Index.
How we count these sales
Every figure comes from completed eBay sales that our collector recorded up to October 30, 2026. We keep US-dollar sales of single working machines only. We drop parts, lots, repair listings and sales with no model in the title. Then we remove price outliers. Also, we publish a cell only when 5 or more sales stand behind it. The price is the item price, with shipping left out. For the full rules, read the index methodology. Bitcoin network data for the mining maths comes from mempool.space.
In short, our take is to trust the sold price, not the asking price. For the Antminer S21 that means $985, give or take the $822 to $994 band.
-Nick
ING Mining
This is general information, not financial advice. Crypto is volatile, and you can lose money. Please do your own research.