Global home calculators
Use your own currency, tariff, label and measurement system. Every calculator shows the formula, assumptions, limitations and official verification routes.
Carry several inputs through one decision
Use these when one calculator is too narrow. Both workflows save only in your browser and expose every derived step.
Energy bills & appliances
Decode fixed charges, energy rates, time bands, labels, EV charging and heating without a made-up global tariff.
Estimate appliance energy and cost in your own currency from label watts, runtime and your electricity rate
Open calculator Working shownEnergy bills & appliancesEffective Electricity Bill Rate CalculatorSeparate fixed charges from energy charges and calculate both all-in and usage-only bill rates
Open calculator Working shownEnergy bills & appliancesElectricity Bill Change ExplainerExplain why an electricity bill changed by separating billing days, daily usage, effective usage rate and fixed charges
Open calculator Working shownEnergy bills & appliancesTime-of-Use Electricity Plan ComparisonCompare peak and off-peak energy charges with a flat-rate plan using the same electricity use
Open calculator Working shownEnergy bills & appliancesHome EV Charging Cost CalculatorEstimate wall energy, charging cost and cost per distance with visible charging losses
Open calculator Working shownEnergy bills & appliancesHeat Pump vs Resistance Heating CalculatorCompare electricity needed for the same useful heat using an editable heat-pump COP
Open calculator Working shownEnergy bills & appliancesAppliance Label Annual Cost CalculatorTurn the annual kWh on an official appliance label into annual and multi-year energy cost
Open calculator Working shownEnergy bills & appliancesSingapore Electricity & Water Bill CalculatorEstimate Singapore household electricity and domestic water from meter readings, current official schedules and GST
Open calculator Working shownEnergy bills & appliancesDubai DEWA Electricity & Water Bill CalculatorEstimate a Dubai DEWA bill from meter readings, current electricity and water slabs, fuel surcharge and VAT
Open calculatorSolar, battery & backup
Value self-consumed solar, exported energy, battery losses and backup runtime as separate decisions.
Separate solar electricity used at home from exports and value each with its own rate
Open calculator Working shownSolar, battery & backupHome Battery Energy-Shift CalculatorEstimate deliverable shifted energy and gross rate-spread value after round-trip losses
Open calculator Working shownSolar, battery & backupGlobal Battery Backup Runtime CalculatorEstimate backup runtime from voltage, amp-hours, usable discharge, conversion efficiency and load
Open calculatorHome projects
Move between metric and US project units before calculating concrete, paint, flooring and packages.
Calculate rectangular concrete volume in cubic metres or cubic yards with explicit unit conversion and waste
Open calculator Working shownHome projectsPaint Quantity Calculator — Litres & GallonsEstimate paint from wall dimensions, openings, coats and the exact product coverage
Open calculator Working shownHome projectsFlooring & Tile Quantity CalculatorEstimate floor area, pieces and packs using metric or imperial dimensions and a visible waste allowance
Open calculatorProperty & area units
Translate international property units while keeping the source unit and measurement boundary visible.