Legacy hardware
Bitmain Antminer A3 (815Gh) mines algorithms with no live market data
No live market data source for this algorithm Returns are zero or minimal in 2026.
Active alternatives in the same hardware class
●
Bitmain
·
ASIC
·
Blake2B
·
RELEASED JAN 2018
Bitmain Antminer A3 (815Gh) — ROI calculator
Profit /day
legacy
Income /day
—
Cost $3.06 @ $0.1/kWh
Hashrate
815Gh/s
Blake2B
Power · Efficiency
1275.0W
1.56 j/Gh
Bitmain Antminer A3 (815Gh) is legacy hardware — its algorithms are no longer tracked by our live pipeline. Returns are zero or minimal at today's rates.
Tap to switch · 6 sections ROI calculator 5/6
ROI calculator
ROI calculator for Bitmain Antminer A3 (815Gh)
Model payback, electricity, and first-year return for this rig.
Hardware cost
$5,000
Electricity rate
$0.10/kWh
Runtime per day
24
Pool fee
2.0%
Difficulty growth /yr
+0%
Net profit /day
$0.00
after electricity & fees
Payback period
—
—
First-year return
$0
—
Projected cumulative profit
The line crosses $0 on the day you break even. Everything above is pure profit.
Monthly P&L · 3-year horizon
Capital cost is booked in month 1. Cumulative columns include the rig purchase, so Net goes positive at true breakeven.
| Month | Earned (mo) | Cost burned (mo) | Cumulative earned | Cumulative cost | Net | % ROI |
|---|
Profit vs cost
Tap to switch · 6 sections ROI calculator 5/6
ROI calculator
ROI calculator for Bitmain Antminer A3 (815Gh)
Model payback, electricity, and first-year return for this rig.
Hardware cost
$5,000
Electricity rate
$0.10/kWh
Runtime per day
24
Pool fee
2.0%
Difficulty growth /yr
+0%
Net profit /day
$0.00
after electricity & fees
Payback period
—
—
First-year return
$0
—
Projected cumulative profit
The line crosses $0 on the day you break even. Everything above is pure profit.
Monthly P&L · 3-year horizon
Capital cost is booked in month 1. Cumulative columns include the rig purchase, so Net goes positive at true breakeven.
| Month | Earned (mo) | Cost burned (mo) | Cumulative earned | Cumulative cost | Net | % ROI |
|---|
Frequently asked
About the Bitmain Antminer A3 (815Gh)
Is the Bitmain Antminer A3 (815Gh) profitable?
As of October 2026, the Bitmain Antminer A3 (815Gh) earns $-3.06/day mining Blake2B at an electricity cost of $0.1/kWh. At this electricity rate it is not profitable.
What is the payback period for the Bitmain Antminer A3 (815Gh)?
Payback equals hardware cost divided by daily profit. The ROI calculator on this page projects payback months for the Bitmain Antminer A3 (815Gh) at $0.1/kWh — adjust the electricity rate and the hardware cost to match your scenario. Most miners aim for 12–24 month payback on new hardware.
What's the break-even electricity rate for the Bitmain Antminer A3 (815Gh)?
Break-even electricity is the rate above which the Bitmain Antminer A3 (815Gh) stops being profitable. The calculator below derives it from the rig's revenue and power draw — anything below this rate yields positive daily profit, anything above turns the rig into a net loss.
