Understand appliance running costs

How much does a window AC cost to run?

At an illustrative 600W average and $0.18/kWh, eight hours daily costs $25.92 over 30 days. See the assumptions and how to use your own rate.

make your bill make sense¢ → $

How to find your electricity rate on your bill

Separate usage charges from fixed fees and enter the right price in an energy calculator.

worked monthly example$14.58

How much does a dehumidifier cost to run?

Understand watts, pints per day and the operating schedule before estimating costs.

a decision, not a deadlineBreak-even

Is replacing an old window AC worth it?

Calculate the purchase premium, annual energy savings and ownership horizon before replacing a working unit.

start with a measured periodkWh → $

5 W · illustrative annual cost$7.88

How to measure appliance electricity use at home

Learn how kWh readings and elapsed time become average watts and estimated cost. See an example log, measurement limits and compatibility checks.

4 min read

Is standby power worth worrying about? Do the math first

Estimate the value of reducing an idle load before buying another energy-saving device.

same kWh, different costWhen matters

How time-of-use electricity rates change appliance costs

Calculate each price band separately and see what shifting a load can actually save.

one bulb · illustrative annual saving$13.40

How much can LED lighting save in a small apartment?

Compare equal brightness, actual watts and hours of use with a simple worked example.

350 kWh/year · monthly average example$5.25

How much does a small refrigerator cost to run?

Use annual kWh or a representative measurement instead of treating the compressor as always on.

30 W · illustrative 30-day cost$3.89

How much does an air purifier cost to run?

Account for fan speed, operating hours and replacement filters when comparing air cleaners.

1,500 W at an example rate$0.27/hour

How much does a 1,500-watt space heater cost to run?

A constant 1,500W draw costs $0.27 per hour at an illustrative $0.18/kWh. Compare monthly schedules, thermostat assumptions and essential safety limits.

0.9 kWh · illustrative cycle$0.16

How much electricity does one dishwasher cycle cost?

A per-cycle calculation that accounts for repeated loads, drying options and separately heated water.

300 kWh/year · worked example$4.50/month

What does a small freezer add to your electricity bill?

Estimate the recurring cost of extra freezer space and compare it with how you will use it.

135 W · sample work schedule$4.28/month

How to estimate the electricity cost of a home office

Count the computer, display and accessories without double-counting their power.

80 W · illustrative viewing cost$1.73/month

How much does your TV cost to run each month?

Include viewing settings and connected equipment in an estimate for the whole entertainment setup.

compare the same time scalekWh/day

How to compare electricity bills with different billing periods

Use daily energy and separate price changes before deciding that household consumption has risen.

1,500 W for four minutes · example$0.018

How much does it cost to boil an electric kettle?

Convert minutes into hours and compare complete boiling sessions at your own electricity rate.

two different watt figuresInput ≠ output

Microwave watts: cooking power is not electricity input

Find the right number for an energy estimate and avoid a common label-reading mistake.

a label is a comparison toolRead the basis

power multiplied by timeW → kW → kWh

How to compare EnergyGuide labels and estimated costs

Compare like-for-like EnergyGuide labels, convert annual kWh using your rate and calculate energy-only payback with a transparent example.

4 min read

Watts, kilowatts and kilowatt-hours: a practical guide

Understand the units behind an appliance estimate, with examples you can reproduce.

change one assumption at a timePrice × use

What a higher electricity rate changes in your household budget

Separate price, consumption and fixed fees with a worked percentage-change example.

illustrative meal$0.11

Induction Cooktop Running Cost: Estimate Each Meal

Estimate induction cooktop electricity cost from cooking stages or measured kWh. See a meal example and include cookware in a purchase decision.

illustrative session$0.14

Toaster Oven Running Cost: Preheat, Cook and Compare

Calculate toaster oven electricity cost for a complete cooking session. Include preheating and compare equal portions with your full-size oven.

illustrative eight hours$0.22

Slow Cooker Running Cost: What an Eight-Hour Meal Costs

Estimate slow cooker electricity cost without treating the rating as constant draw. Include warming time and calculate a cost per serving.

illustrative holding period$0.04

Rice Cooker Keep-Warm Cost: Count Cooking and Holding

Calculate rice cooker keep-warm electricity separately from cooking. See an eight-hour example and learn which measurement can answer your question.

illustrative daily routine$0.06

Coffee Maker Running Cost: Brewing vs Keeping It Hot

Work out coffee maker electricity cost by separating brewing, the warming plate and standby. Compare a daily pot with a measured session.

illustrative full cycle$0.12

Electric Pressure Cooker Energy Use: Count the Full Cycle

Estimate pressure cooker electricity for heat-up, pressure cooking and warming. Compare complete recipes instead of the timer display alone.

illustrative saving per serving$0.07

Does Batch Cooking Save Electricity? Compare Per Serving

Compare batch cooking electricity per serving, including extra batches and reheating. Use a worked example without assuming every larger meal saves.

illustrative preheat$0.11

Oven Preheating Energy Cost: Measure the Missing Minutes

Calculate the electricity used to preheat an oven and distinguish it from baking. Learn when shortening idle time is a meaningful change.

illustrative annual energy$98.55

Is a Second Fridge Worth Running? Add Up the Annual Cost

Compare the annual electricity and practical value of a second refrigerator. Include measured consumption, food use and the cost of a replacement.

check the heating sourceTwo meters?

Cold vs Warm Wash: Calculate the Energy Difference

Compare cold and warm laundry cycles while accounting for water heating outside the washer. Use equal loads and keep fabric-care needs in view.

count both appliancesNet saving

Does a Faster Washer Spin Reduce Drying Energy?

Compare extra washer spin energy with the dryer energy it may avoid. Use a complete wash-and-dry example and check fabric and machine limits.

fair comparisonEqual dryness

Sensor Dry vs Timed Dry: Compare Cost at Equal Dryness

Compare sensor and timed dryer cycles using the same laundry and dryness target. Include extra cycles instead of relying on minutes alone.

illustrative monthly fan$0.14

Bathroom Exhaust Fan Running Cost: Include Lights Separately

Calculate bathroom fan electricity from watts and operating hours. Separate lighting and heating, and keep required ventilation in the plan.

illustrative monthly use$0.22

Range Hood Electricity Cost: Fan Speed, Lights and Use

Estimate range hood electricity for cooking sessions. Count the fan and lights separately, and compare ventilation performance before wattage.

illustrative year$15.77

Wi-Fi Router Electricity Cost: Estimate 24-Hour Use

Calculate router electricity cost from actual input or measured kWh. Separate the router, modem and other devices before estimating annual use.

illustrative added nodes/year$18.92

Mesh Wi-Fi Energy Cost: Add Up Every Node

Estimate a mesh network’s electricity by counting all powered nodes and the gateway. Compare the added cost with the coverage you actually need.

illustrative battery-only energyAbout 1¢

Laptop Charging Cost: Battery Capacity Is Only a Starting Point

Estimate laptop charging electricity and separate it from workday use. Understand watt-hours, adapter ratings and the limits of battery-only calculations.

illustrative gaming/month$6.48

Gaming PC Electricity Cost: Use Wall Power, Not PSU Size

Calculate a gaming PC’s electricity from gaming, idle and sleep periods. Include the monitor and avoid treating PSU capacity as constant consumption.

verify sleepState matters

Computer Sleep vs Shutdown: Compare the Overnight Cost

Calculate sleep, shutdown and idle computer electricity for your schedule. Verify the actual power state and account for updates and work needs.

illustrative work month$0.95

External Monitor Electricity Cost: Work Hours and Sleep

Estimate one or two monitors’ electricity using active and sleep periods. Account for brightness, USB charging and shared power measurements.

rest-mode settingsFeatures matter

Game Console Rest Mode Cost: Check Enabled Features

Estimate console rest-mode electricity for your schedule. Check downloads, network access and USB charging instead of assuming one standby wattage.

useful measurementWeekly kWh

Printer Standby Electricity: Measure the Week, Not One Page

Estimate printer standby, sleep and active electricity for occasional home use. Check model shutdown guidance and compare complete weekly energy.

illustrative annual idle cost$0.16

USB Charger Idle Power: Is Unplugging Worth the Effort?

Put an unused USB charger’s electricity in perspective. Calculate a hypothetical idle load and understand why a meter may display zero.

marginal costNext kWh

Tiered Electricity Rates: Calculate the Next kWh Correctly

Calculate a tiered electricity bill with a simple example. Distinguish average cost from the rate that applies to the energy you add or avoid.

use, charges, paymentThree columns

Budget Billing vs Actual Usage: Why Payments Can Mislead

Read budget billing without confusing a steady monthly payment with energy savings. Track actual charges, kWh and the account balance separately.

before comparingRead dates

Estimated Electricity Readings: Explain a Catch-Up Bill

Check whether electricity readings are actual or estimated before blaming an appliance. Compare meter dates and consumption across the full interval.

check each columnkWh ≠ kW

Smart Meter Interval Data: Turn a Usage Download into Clues

Read 15-minute or hourly electricity data without confusing kWh and kW. Find useful patterns while recognizing that the meter does not identify appliances.

better baselineSeveral nights

Apartment Baseload Electricity: Find the Always-On Pattern

Estimate an apartment’s background electricity from quiet periods. Separate cycling appliances from constant loads and avoid overreading one interval.

not just amount dueCheck kWh

Bill Credit or Energy Saving? Read a Lower Electric Bill

Separate utility credits and account adjustments from reduced electricity use. Compare kWh, rates and recurring charges with a simple example.

seasonal context12 months

Compare 12 Months of Electricity Costs Without Seasonal Bias

Build a yearly electricity comparison using kWh, days, rates and household changes. Distinguish historical spending from a forecast at today’s prices.

payback denominatorNet savings

Energy-Saving Payback: Compare the Cost You Actually Add

Calculate simple energy payback from incremental cost and net annual savings. Distinguish replacement from a first purchase and test uncertain inputs.

first budget questionWho pays?

Hot-Water Energy Budget for Renters: Find What You Pay For

Identify how your apartment heats and bills hot water before estimating savings. Separate electric, gas and shared systems and avoid double counting.