PennyloomMake sense of everyday money
Explore tools
EXPLORE Pennyloom

Energy

Small changes. A more efficient everyday.

Electricity cost calculator

Estimate energy use from actual operating power and hours. Enter your own tariff; this is not a national average or a complete utility bill.

EV charging cost calculator

Include charging losses when estimating the electricity cost and approximate charging time. Actual power can taper.

Solar savings calculator

Compare self-consumption and exports using a generation estimate from your installer. This is a simple cash-flow scenario.

Turn watts and hours into an electricity budget

A worked appliance calculation, with clear limits for cycling equipment, tariffs and fixed charges.

Read the guide

Battery and UPS runtime

Estimate how long a battery or UPS can run a constant load. Include usable capacity and conversion losses; actual runtime varies with temperature, battery condition and discharge rate.

Privacy choices

Tools work without analytics. You may allow interaction measurement without sending your financial inputs. You can manage or disable advertising below. Regional consent requirements still apply.