Quirkulator

Household Energy Calculators

15 calculators covering running costs, kWh pricing and solar output, each with its formula and worked examples.

Household Energy Calculators brings together 15 calculators for running costs, kWh pricing and solar output, including Air Conditioner BTU Calculator, EV Charging Cost Calculator, Heat Pump Sizing Calculator and Radiator BTU Calculator.

These are separate pages rather than one tool with a mode switch because the inputs differ, the interpretation differs, and the question behind each one is different. Each page opens with the formula it uses, defines every variable, and walks the calculation through real numbers before you type anything.

All 15 pages compute in your browser: nothing you type is sent anywhere, and results update as you edit. Each one carries worked examples, interpretation bands where a score needs context, and a FAQ answering what people actually ask about that calculation.

The collection is part of Home & Construction, and every page links to the neighbouring calculations you usually need next.

15 pages in this collection

Air Conditioner BTU CalculatorSize an air conditioner in BTU from room area, sun exposure and occupancy.Appliance Running Cost CalculatorTurn an appliance wattage into a real cost per hour, per month and per year.Battery Backup Runtime CalculatorWork out how long a battery bank will carry a load, allowing for usable depth and losses.EV Charging Cost CalculatorWork out the cost of a charge at home and compare it with public rapid pricing.EV Charging Time CalculatorWork out how long a charge takes on any charger, including the rapid taper.Generator Sizing CalculatorSize a generator from your running load plus the starting surge of the largest motor.Heat Pump Sizing CalculatorEstimate the kW output a heat pump needs from floor area and fabric heat loss.Insulation R-Value CalculatorConvert insulation thickness and conductivity into R-value and U-value.kWh Cost CalculatorTurn a meter reading in kilowatt hours into a bill total, standing charge included.LED Savings CalculatorCompare an old lamp against an LED and see the yearly saving and payback.Radiator BTU CalculatorSize a radiator in BTU and watts from room volume and the type of room.Solar Panel Output CalculatorEstimate daily and annual generation from panel count, wattage and peak sun hours.Solar Payback Period CalculatorWork out how many years a solar installation takes to repay its own cost.Standby Power Cost CalculatorWork out what devices left on standby quietly cost you over a year.Water Heater Running Cost CalculatorCost the energy to heat a volume of water using its real specific heat capacity.

Related collections

Home & Construction →
Building Material Calculators28 calculators covering paint, tile, concrete, timber and plaster quantities, each with its formula and worked examples.28 calculators