Estimate monthly cost
Turn watts, hours, days, and rates into daily, monthly, and annual electricity cost.
Energy cost tools
Energy Cost Tools for Bills, Appliances, Charging, and Runtime
Estimate energy use, monthly cost, charging cost, battery runtime, and simple savings before a device, appliance, vehicle, or upgrade changes your bill. Example: compare a space heater, EV charge, LED bulb swap, or battery runtime before spending money.
Built for homeowners, renters, EV owners, DIYers, small shops, facility managers, and anyone comparing energy costs. Inputs stay local unless a tool clearly says otherwise.
What are BoringToolsKit energy cost tools?
BoringToolsKit energy cost tools are private-first calculators for appliance electricity cost, bills, charging, runtime, and savings. BoringToolsKit energy cost tools include this reproducible appliance electricity cost table. It calculates hypothetical 30-day costs across appliance wattages, daily runtimes, and editable price-per-kWh scenarios. It demonstrates the formula rather than asserting a local utility rate; taxes, tiers, fixed fees, and equipment cycling may change a bill.
Explore the reproducible Appliance Electricity Cost Scenario Benchmark →
Decision support
Use these tools before money changes hands
Compare upgrades
Check LED savings, EV charging cost, and battery runtime before you buy equipment or change habits.
Keep assumptions visible
Rates, wattage, efficiency, and usage vary, so the tools show inputs and caveats instead of hiding the math.
Tool cluster
Recommended tools
Featured
Electricity Cost Calculator
Electricity cost calculator: compute what any appliance costs to run from wattage, hours used, and your rate. Editable rates, free, runs locally in your browser.
Featured
LED Savings Calculator
LED savings calculator: compare LED vs incandescent bulbs and compute yearly energy cost savings and payback period. Free, runs in your browser, no signup.
Featured
EV Charging Cost Calculator
EV charging cost calculator: estimate the cost to charge your electric car from battery size, electricity rate, and efficiency. Free, editable rates, no signup.
Featured
Battery Runtime Calculator
Battery runtime calculator: estimate how long a battery lasts from capacity, voltage, load watts, and efficiency. Free, private, runs in your browser.
Useful
Watts to Amps Calculator
Watts to amps calculator: convert watts to amps for DC, single-phase AC, or three-phase AC circuits using voltage and power factor. Free, private, no signup.
Useful
Solar Panel Savings Calculator
Solar panel savings calculator: estimate yearly and lifetime electricity savings from system size, rates, and sunlight. Editable rates, no signup, runs locally.
Useful
Generator Size Calculator
Generator size calculator: total your appliance and HVAC wattage, add starting surge, and pick the right generator size. Free, runs locally in your browser.
Useful
Generator Runtime Calculator
Generator runtime calculator: estimate run hours from fuel tank size, load, and consumption rate. Free, editable rates, runs locally in your browser, no signup.
Useful
Generator Load Calculator
Generator load calculator: total running and starting watts for your appliances, then size the right generator. Editable loads, free, runs in your browser.
Useful
EV vs Gas Savings Calculator
EV vs gas savings calculator: compare electricity cost per mile against gas, plus maintenance, and see total yearly savings. Free, editable rates, no signup.
Useful
Gas Budget Calculator
Gas budget calculator: monthly and yearly fuel spending. Free gas budget calculator with the formula shown - runs entirely in your browser, no signup.
Useful
Fuel Cost Per Mile Calculator
Fuel cost per mile calculator: compute driving cost per mile from fuel price, vehicle efficiency, and trip distance. Editable rates, free, no signup needed.
Trust model
Useful pages, not thin pages
These collections group existing tools around real decisions. The calculators keep assumptions visible, link to related tools, state important limitations, and point toward quality evidence so you can verify inputs before relying on a result.
FAQ
Common questions
Are electricity cost estimates exact?
No. They are planning estimates. Actual bills can include taxes, demand charges, time-of-use rates, standby draw, and appliance cycling.
Where should I get my electricity rate?
Use the rate printed on your utility bill when possible. Public average-rate data is useful for rough comparisons but not a replacement for your bill.
What can make an energy estimate differ from my bill?
Appliance cycling, standby draw, seasonal use, time-of-use pricing, taxes, demand charges, and conversion losses can all change actual cost.