100 MH/s Ethereum Calculator
Estimate historical Ethereum mining revenue, electricity cost, and profit for a 100 MH/s setup using adjustable network assumptions. Because Ethereum no longer uses proof-of-work after the Merge, this calculator is best used for historical analysis, backtesting, and comparing Ethereum-era GPU economics with current alternative mining opportunities.
Ethereum Mining Profit Calculator
How the estimate works
- Blocks per day86,400 ÷ block time
- Share of networkYour MH/s ÷ Network MH/s
- Coin outputShare × blocks/day × reward
- Electricity costkW × 24 × rate
Revenue vs Cost Chart
Expert Guide to Using a 100 MH/s Ethereum Calculator
A 100 MH/s Ethereum calculator is a specialized tool for estimating how much ETH a miner could have earned from a graphics card rig or ASIC-like setup capable of producing 100 megahashes per second on Ethash. In practical terms, 100 MH/s was a meaningful benchmark during the GPU mining era. It usually represented a tuned multi-GPU rig or a very efficient high-end single-card setup under ideal conditions. Although Ethereum is no longer mined today because the network switched from proof-of-work to proof-of-stake, the keyword remains important for historical profitability research, tax record reconstruction, ROI analysis, and comparing legacy GPU rigs against modern alternatives.
The most important point to understand is that a calculator cannot create a universal, permanent answer. Mining economics always depended on several moving variables: network hashrate, block reward, block time, coin price, electricity cost, mining pool fee, and actual uptime. A 100 MH/s rig could be solidly profitable in one market cycle and unprofitable in another. That is why the best Ethereum mining calculators focus on user inputs instead of fixed outputs. The calculator above follows the standard proof-of-work formula used by miners for years: your expected daily coin share is your percentage of the total network hashrate multiplied by the total number of blocks found per day, multiplied by the block reward, adjusted for uptime and fees.
Why 100 MH/s mattered in Ethereum mining
Hashrate is the speed at which your hardware performs hashing work. On Ethereum’s former Ethash algorithm, performance was typically discussed in MH/s rather than TH/s for individual miners. A 100 MH/s benchmark was useful because it sat at a point where efficiency, scaling, and operating cost became easy to model. For example, many miners built around the idea of reaching 100 MH/s while keeping power draw under control. That made it easier to judge whether low electricity prices could cover daily operating costs and whether hardware would pay for itself before market conditions changed.
Quick interpretation: 100 MH/s by itself never guaranteed profit. What mattered was the combination of hashrate, power draw, electricity rate, ETH price, and network competition. A calculator turns those variables into a realistic estimate instead of a guess.
What inputs you should use
To get a realistic result from a 100 MH/s Ethereum calculator, you need better data than “my rig does 100 MH/s.” Start with your true wall power, not software-only GPU power. Many miners underestimate consumption because they ignore fans, risers, power supply inefficiency, CPU overhead, storage, and cooling. If your software says 650 watts but your wall meter reads 750 watts, profitability changes materially over a month or a year.
- Hashrate: Your actual sustained hashrate, not your best-case benchmark.
- Power draw: Total rig power at the wall in watts.
- Electricity rate: The all-in cost per kWh, including delivery charges when relevant.
- Network hashrate: Total competition on the network.
- Block reward and block time: These determine total coins created each day.
- Pool fee: Usually around 0.5% to 2%, depending on the pool and payout method.
- Uptime: A realistic estimate after accounting for reboots, maintenance, and internet outages.
If you are backtesting a historical period, use the network hashrate and market price from that exact period. If you are modeling opportunity cost for old GPUs today, you can still use the formula, but you should treat the result as an Ethereum-style benchmark rather than current ETH income because native Ethereum mining no longer exists.
How the math works for a 100 MH/s setup
The expected output formula is straightforward. First, calculate how many blocks the network produces each day by dividing 86,400 seconds by average block time. Second, convert network hashrate to the same unit as your rig. If the network is 900 TH/s, that is 900,000,000 MH/s. Third, divide your effective hashrate by total network hashrate. If your 100 MH/s rig runs at 98% uptime, your effective hashrate is 98 MH/s. Then multiply your network share by blocks per day and block reward. Finally, subtract pool fees and convert the resulting daily coin output into dollars using market price. Electricity cost is power in kilowatts multiplied by 24 hours multiplied by your per-kWh price.
- Effective hashrate = 100 MH/s × uptime percentage
- Blocks per day = 86,400 ÷ block time
- Network share = effective MH/s ÷ network MH/s
- Daily coins = network share × blocks per day × reward × fee adjustment
- Daily revenue = daily coins × coin price
- Daily electricity cost = kW × 24 × power price
- Daily profit = daily revenue – daily electricity cost
Real-world GPU efficiency examples
The quality of a 100 MH/s Ethereum estimate depends heavily on efficiency. Two rigs can produce the same hashrate but very different profits because one consumes far more electricity. The table below shows commonly reported, approximate Ethash-era performance ranges for popular GPUs when tuned for mining. Actual results varied by memory vendor, silicon quality, overclock, undervolt, ambient temperature, and miner software, but these figures are representative enough for planning.
| GPU Model | Approx. Ethash Hashrate | Approx. Tuned Power | Efficiency | Notes |
|---|---|---|---|---|
| NVIDIA RTX 3070 | 60 MH/s | 130 W | 0.46 MH/W | Widely regarded as one of the most efficient Ethereum GPUs. |
| AMD RX 6800 | 64 MH/s | 145 W | 0.44 MH/W | Strong efficiency with proper memory tuning. |
| NVIDIA RTX 3080 | 97 MH/s | 230 W | 0.42 MH/W | High raw output, but thermals mattered a lot. |
| NVIDIA RTX 3090 | 120 MH/s | 285 W | 0.42 MH/W | Premium card with strong hashrate and high capital cost. |
Those numbers show why the same 100 MH/s target could come from different hardware profiles. A 100 MH/s system built for efficiency might run around 220 to 280 watts in a very optimized scenario, while a less efficient build might exceed 400 watts or far more once the whole rig is counted. On a low electricity tariff the difference may feel manageable. On a high tariff the inefficiency can erase nearly all expected profit.
Electricity prices can make or break your result
Miners often focus on coin price because it is exciting and visible, but electricity is the controllable variable that most consistently determines survivability during weak markets. The U.S. Energy Information Administration explains how retail electricity prices vary by location and what factors affect them. If you want better inputs, review local rate structures and utility fees rather than relying on a generic national average. For background, see the U.S. Energy Information Administration’s explanation of electricity pricing at eia.gov and the U.S. Department of Energy guide to estimating appliance and electronics energy use at energy.gov. For broader energy cost methodology, the National Renewable Energy Laboratory also publishes analysis resources at nrel.gov.
The table below uses approximate retail residential electricity figures to illustrate how much location matters. Rates move over time, and commercial or negotiated tariffs can differ significantly, but the comparison demonstrates why miners constantly optimized for low-cost power.
| Location Example | Approx. Electricity Rate | 750 W Rig Cost per Day | 750 W Rig Cost per 30 Days | Impact on Mining |
|---|---|---|---|---|
| Washington | $0.11 per kWh | $1.98 | $59.40 | More favorable for older or less efficient rigs. |
| Texas | $0.15 per kWh | $2.70 | $81.00 | Still workable if hardware is efficient and market conditions are strong. |
| New York | $0.25 per kWh | $4.50 | $135.00 | Profit margin becomes much thinner. |
| California | $0.31 per kWh | $5.58 | $167.40 | Very difficult for many consumer mining setups to remain profitable. |
Why your calculator result changes over time
Ethereum-era mining income was never static. When price rose, more miners entered the network. As hashrate expanded, each miner’s share of total rewards declined unless their own hashrate also increased. When price fell, weak miners shut down, which could lower competition and improve returns for efficient operators. That feedback loop is one reason mining calculators should be viewed as snapshots, not promises.
Another major factor was protocol history. Ethereum’s block reward changed over time, and there were also periods where transaction fee income meaningfully boosted miner revenue. A simple calculator often uses base block reward only, which is useful for conservative planning, but advanced backtesting may need to account for fee spikes and time-specific network conditions.
How to judge a 100 MH/s setup today
Since native ETH mining is gone, the modern use of a 100 MH/s Ethereum calculator is mainly analytical. Here are the main ways people still use it:
- Historical profitability analysis: Estimate what a rig could have earned in a specific past month.
- Tax and accounting records: Reconstruct expected production and cost basis.
- Hardware ROI reviews: Compare what old GPU investments actually returned.
- Alternative coin benchmarking: Use ETH-era efficiency as a baseline for comparing other proof-of-work networks.
- Energy planning: Understand whether a rig’s power profile made economic sense under different tariffs.
Common mistakes when using an Ethereum calculator
Many inaccurate estimates come from predictable input errors. If you avoid the following mistakes, your numbers will be much more useful:
- Using software power instead of wall power. This understates cost.
- Ignoring uptime. Very few rigs maintain perfect 100% availability over long periods.
- Forgetting pool fees. Small percentages matter over time.
- Mixing historical and current data. A 2021 price with a 2022 network hashrate produces nonsense.
- Assuming profit equals cash flow. Taxes, cooling, replacement fans, and downtime all matter.
- Treating the result as guaranteed. Mining is probabilistic and market-driven.
What a strong calculator should tell you
A good 100 MH/s Ethereum calculator does more than output one daily revenue number. It should show expected coin production, gross revenue, power cost, net profit, and time-based views such as daily, weekly, monthly, and annual totals. It should also let you stress-test the setup. If coin price drops by 20%, if electricity rises by 3 cents per kWh, or if network hashrate climbs, how quickly does your margin disappear? In real mining operations, those sensitivity checks are often more important than the headline estimate.
The calculator above is built around that idea. It gives you the core economics and visualizes revenue, electricity cost, and profit across multiple periods. That makes it easier to answer the practical question users actually care about: not “how many MH/s do I have?” but “what does 100 MH/s mean financially under realistic conditions?”
Final takeaway
A 100 MH/s Ethereum calculator is best understood as a profitability model, not a magic prediction engine. When fed with solid assumptions, it becomes a very effective tool for reconstructing Ethereum mining returns, comparing GPU efficiency, and understanding the relationship between energy cost and crypto mining margin. The most accurate use cases are historical or educational because Ethereum itself is no longer proof-of-work. Even so, the framework remains valuable. Hashrate, power, electricity price, and network competition are the same levers that define profitability across many mining environments.
If you want trustworthy results, start with measured power draw, realistic uptime, historically correct network data, and a conservative view of market price. Then use the calculator to compare scenarios instead of hunting for one perfect answer. That is how professional miners and analysts approached a 100 MH/s Ethereum setup when profitability really mattered.