Practical calculators, converters, and readable reference pages.
Calculator chooser
Use this page as a compact tool chooser. For electricity questions, start from the number you already have; if the number is unclear, move to a guide before calculating.
Start here
Best starting point when you have wattage, daily hours, and a rate and want daily, monthly, or yearly usage-cost estimates.
Home energy
What it shows
Estimate the daily, monthly, and yearly electricity cost of an appliance from its wattage, usage hours, and electricity rate.
Best for
Comparing the running cost of heaters, fans, computers, kitchen appliances, and other devices before you buy or leave them on every day.
Other input paths
Start with the number you already have: watts and hours for energy use, kWh and rate for cost, or wattage and rate for a quick one-hour comparison.
Home energy
What it shows
Convert appliance wattage and runtime into kWh so you can estimate energy use before working out electricity cost.
Best for
Turning an appliance label in watts into usable energy consumption over a chosen number of hours.
Home energy
What it shows
Estimate how much an appliance costs to run for one hour, a typical 8-hour stretch, or a full 24-hour day.
Best for
Getting a quick hourly running-cost estimate before checking longer daily or monthly usage.
Home energy
What it shows
Convert a known kWh amount into estimated electricity cost using your rate per kWh.
Best for
Turning known energy use from a bill, meter, appliance estimate, or watts-to-kWh result into a practical cost estimate.
Input support
This chooser stays short on purpose. Use these routes when you need the right input, then return to the calculator that matches it.
Choose the right calculator for daily cost, hourly cost, or kWh conversion.
Understand why wattage needs runtime before it becomes billable energy use.
Learn where to look before entering a wattage estimate into a calculator.
Use the guide hub when you need examples, bill-input help, measured-kWh guidance, or a bill-difference check.