Start with the operational question
Use the calculators in this hub together and confirm that their periods, units and assumptions are compatible.
Calculator hub
Home Calculators
Measure the room, record product or tariff details and keep exclusions visible before ordering materials or comparing a bill.
Decision paths
Connect the metrics before acting
Calculators
9 toolshome
Paint Coverage Calculator
Estimate paint volume from surface area, product coverage, coat count and an explicit waste allowance.
Open calculatorhome
Room Dimensions Calculator
Calculate floor area, room volume and wall area for a rectangular room from measured dimensions.
Open calculatorhome
Tile Coverage Calculator
Estimate the number of rectangular tiles needed for a rectangular floor with a stated waste allowance.
Open calculatorhome
Electricity Cost Calculator
Estimate the energy-charge portion of an electricity bill from kilowatt-hours, an entered rate and billing days.
Open calculatorhome
Room Lighting Calculator
Estimate a lamp count from a rectangular room, an illuminance target you choose and stated lamp lumens.
Open calculatorhome
Moving Cost Calculator
Total an entered moving-service quote, packing, travel and contingency costs for a planning scenario.
Open calculatorhome
Solar Panel Output Calculator
Estimate daily and annual photovoltaic energy from stated system capacity, sun hours and system losses.
Open calculatorhome
Appliance Energy Use Calculator
Calculate an appliance’s electricity use in watt-hours and kilowatt-hours from its stated power, daily running time and number of days.
Open calculatorhome
Energy Efficiency Calculator
Calculate the energy efficiency percentage and losses from entered useful energy output and total energy input for one matched scenario.
Open calculatorRelated guides
Browse all guidesGuide
Measure a Room Before Ordering Materials
A concise method for measuring rectangular rooms, openings and paint-project inputs before estimating materials.
Read guide →