1Set the shared assumptions
3Compare what remains
Contribution means revenue after the modelled fee, less electricity. It is not total profit or investment ROI.
Where does the comparison change?
The crossover tariff compares each alternative with the baseline. Hashrate, power, revenue and fees stay fixed. This is not a break-even tariff for the business.
Formulas and limits
energy_kWh_day = power_W / 1000 × 24
efficiency_J_TH = power_W / hashrate_TH_s
revenue_after_fee = hashrate_TH_s × revenue_per_TH_day × fee_factor
contribution = revenue_after_fee − energy_kWh_day × tariff_per_kWh
crossover_tariff = Δrevenue_after_fee / Δenergy_kWh_day
Before-share mode: fee_factor = 1 − fee_percent / 100. Already-deducted mode: fee_factor = 1. Revenue is always expressed per TH/s per 24-hour day.
This model treats developer share as a proportional reduction in revenue. Check that this matches your build terms and data. It excludes cooling and facility overhead outside the wall-power input, pool fees not already reflected in revenue, downtime, equipment costs, financing and taxes. Do not use pool-effective hashrate already reduced by the same fee as a before-fee hashrate input.
Calculations use unrounded values. Displayed values are rounded. Zero hashrate makes J/TH undefined. Electricity tariffs must be nonnegative. A zero difference in power may mean there is no finite crossover, or that the profiles remain tied.
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