ASIC Miner ROI: How to Calculate Your Break-Even

TL;DR. One formula, 6 variables, a spreadsheet. For an Antminer S21 Pro at median 2026 hashprice: +$6.38/day net hosted at $0.07/kWh, −$3.86/day at home at $0.14/kWh. Detailed calculation below, applicable to any machine.

The formula in one line

Profit/day = (hashrate_TH × hashprice_$_TH_day)
            − (power_kW × 24 × kWh_$)
            − pool_fees
            − amortized_setup

Everything else is just applying this formula.

The 6 variables to collect

1. Hashrate (TH/s)

Manufacturer spec. Antminer S21 Pro = 220 TH/s nominal. Practical tolerance ±3-5%.

2. Power (W)

Manufacturer spec, "Power consumption at wall". S21 Pro = 3,300 W (3.3 kW).

3. Hashprice ($/TH/day)

Hashrate Index, WhatToMine, ASIC Miner Value. In 2026, oscillates between $0.03 and $0.08.

For prudent calculation: take the 30-day median, not the peak.

4. kWh rate

• US residential avg: $0.12-$0.18 (varies by state — check actual utility bill)
• EU residential: $0.20-$0.30
• US hosting: $0.055-$0.075
• EU hosting: $0.07-$0.10

5. Pool fees

1-2% of gross for standard FPPS.

6. Setup fees (hosting only)

$100-300 one-shot. Amortize over contract length: $150 over 12 months = $0.41/day.

Step-by-step: S21 Pro example

Assumptions: hashprice $0.055/TH/day, pool fees 1.5%.

Daily gross revenue

220 × 0.055 = $12.10/day

Daily electricity cost

Home ($0.14/kWh):

3.3 × 24 × 0.14 = $11.09/day

Hosted ($0.07/kWh):

3.3 × 24 × 0.07 = $5.54/day

Pool fees

12.10 × 1.5% = $0.18/day

Daily net profit

Setup	Net/day
Home	12.10 − 11.09 − 0.18 = +$0.83
Hosted (no setup)	12.10 − 5.54 − 0.18 = +$6.38
Hosted (setup amortized)	6.38 − 0.41 = +$5.97

12-24 month modeling

Projected difficulty

Bitcoin difficulty climbs 10-20%/year average 2024-2026. Your BTC revenue drops mechanically by that proportion at constant hashrate.

Rule of thumb: over 12 months, deduct ~12-15% from average gross.

Upcoming halving (2028)

If your horizon crosses spring 2028, include a discontinuity: gross revenue cut in half that day (unless BTC price compensates).

Halving detail.

BTC price sensitivity

All revenue denominated in BTC. Immediate conversion to USD = absorb daily volatility. Accumulation = also speculation.

Complete example: S21 Pro over 12 months

At home ($0.14/kWh)

Line	Annual
Gross (no difficulty)	$4,415
Difficulty adjustment −7%	$4,106
Electricity	−$4,049
Pool fees	−$66
Net	−$9 (break-even)

Hosted ($0.07/kWh)

Line	Annual
Gross	$4,106
Electricity	−$2,024
Pool fees	−$66
Setup fee	−$150
Net	+$1,866

Machine-alone payback (~$4,500): ~2.5 years hosted. Effectively never at $0.14 home rate.

⚠️ Theoretical model. Hashprice can crash. BTC can drop. Every projection is conditional. Mining involves capital loss risk.

Online tools

For quick checks:

• WhatToMine — multi-coin calculator, US reference
• ASIC Miner Value — per ASIC, ROI estimated
• Hashrate Index — spot hashprice + history

⚠️ These calculators don't show their formula — useful for verification, not for understanding. My method here, you can contest line by line.

The 4 quick-math pitfalls

1. Ignoring difficulty rise. Calculating on today's hashprice as if stable for 12 months = overstates by 10-15%.
2. Forgetting taxes / fees on kWh. Utility "rate" is often pre-delivery, pre-taxes. Mixing skews everything.
3. Overestimating uptime. A home machine runs 90-95%, not 100%. Count ~5-10% cumulative downtime.
4. Ignoring replacement cost. At 3-4 years your ASIC is obsolete. Amortize replacement in long-term modeling.

Further reading

• Bitcoin mining electricity cost
• Is bitcoin mining profitable in 2026?
• Bitcoin mining colocation cost
• Best ASIC miners 2026

The Bitcoin Bay is an introducer. No profitability figure is a guarantee.