FIRST THE BILL. THEN THE MINER.
A Bitaxe Gamma draws about 17 W and an Avalon Nano 3S 140 W. This calculator turns that into kWh and pounds on the Ofgem price cap or a two-rate tariff such as Economy 7, using your own rates.
Free · No sign-up · Calculated on your device
A miner works like a small heater: 140 W of electricity is roughly 140 W of heat. In winter that heat is not wasted in a closed room, but a heat pump delivers more heat per kWh than a resistive heater or a miner.
With seven off-peak hours, a miner that runs around the clock uses only about 29% of its electricity at the night rate. Running it only off-peak cuts the mining time by about 70% and the bill by even more, because every kWh is then at the night rate.
Solo mining with a small device is in practice a lottery ticket for a whole block; in a pool, income is very small and depends on the price and network difficulty. People buy one to learn, to support the network and to reuse the heat.
FROM THE NUMBERS TO THE DEVICE
Power draw, hashrate and noise differ from model to model; Mineshop's product pages list the power of each device. This calculator is provided by Mineshop.eu, an EU hardware retailer based in Ireland. UK orders ship from Ireland and UK import VAT or duty may apply on delivery (see the shipping policy).
Yearly use = power × running hours per day × 365 ÷ 1,000. On a two-rate tariff the off-peak share is the off-peak hours within the running time, or 100% if the miner only runs off-peak; rates are entered in pence per kWh. Power figures: Mineshop product pages (Bitaxe Gamma 1.2 TH/s about 17 W; Avalon Nano 3S 6 TH/s, 140 W); NerdQaxe++: 4.8 TH/s at about 16.7 J/TH, so about 80 W. Ofgem states there is no VAT on electricity from 1 October 2026 to 31 March 2027.
No cookies, no analytics and nothing you enter is sent anywhere. Updated: 29 September 2026.