⚡ Device Power
W

Found on the label or plug of your device

🕐 Usage Time
4 hrs
7 days
💰 Electricity Rate
$/kWh

Check your electricity bill (US avg: $0.13/kWh)

⏰ Time of Use (TOU) Pricing
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Daily cost — updates live
— kWh/day

Crunching your electricity numbers…

💰 Your Electricity Cost Results
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Annual Electricity Cost
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per year
Based on your inputs · Actual cost varies with usage
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per day
Daily Cost
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per week
Weekly Cost
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per month
Monthly Cost
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kWh/day
Energy Used
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kWh/month
Monthly Usage
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kWh/year
Annual Usage
💡 What You Could Save
LED bulbs instead of halogen
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Reduce usage by 1 hr/day
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Switch to off-peak hours
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📊 Cost Comparison by Usage Level

Usage Scenario
kWh/Month
$/Month
$/Year
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🛠️ Ways to Reduce This Cost

Understanding Your Electricity Bill

Most people have no idea what each appliance costs to run. This guide explains it simply. Once you know the numbers, saving money becomes easy.

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What Is a kWh?

kWh stands for kilowatt-hour. It’s the unit your electricity company uses to bill you. One kWh is the energy used by a 1,000-watt device running for one hour. A 100W LED TV running for 10 hours uses 1 kWh. Simple as that.

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Watts vs. kWh

Watts (W) measure power — how fast a device uses energy. kWh measures actual energy used over time. To find kWh: multiply watts by hours, then divide by 1,000. A 500W appliance running for 2 hours uses 1 kWh.

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How Your Bill Is Calculated

Your supplier charges per kWh used. The price varies by country and tariff. Most bills also include a daily standing charge — a fixed fee just for being connected to the grid. Some areas also have tiered pricing where the rate increases the more you use.

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What Uses the Most Energy?

Heating and cooling use the most. HVAC (air conditioning and heating) is 50–70% of a typical home bill. Water heating is next at 15–20%. Then appliances and lighting. Target HVAC first if you want to cut your bill significantly.

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Time of Use Rates

Many suppliers offer lower prices at night (off-peak hours). Peak hours are usually weekday afternoons and evenings. Running your dishwasher, washer, and dryer at night can save 30–50% on those loads. Check if your supplier offers this plan.

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Standby Power Waste

Most electronics use power even when switched off. This is called standby power or “vampire load.” A TV on standby uses 0.5–3W. Sounds small — but 20 devices adds up to $100+ per year. Use smart power strips to eliminate it.

📐 The Simple Formula Behind This Calculator

kWh per day = Watts ÷ 1,000 × Hours per day Daily Cost = kWh per day × Rate per kWh Monthly Cost = Daily Cost × 30  |  Annual Cost = Daily Cost × 365

For devices not used every day: Weekly kWh = (Watts × Hours × Days per week) ÷ 1,000
For time-of-use pricing: split hours into peak and off-peak, multiply each by the correct rate, then add them together.
For glycol or other fluids — this calculator handles pure electricity costs only.

Typical Appliance Running Costs (USA at $0.13/kWh)

These are estimates. Your actual cost depends on your rate and exact usage.

ApplianceTypical WattsDaily UseMonthly CostAnnual Cost
Central Air Conditioner3,500W8 hrs$109$1,328
Electric Water Heater4,500W3 hrs$53$640
Electric Clothes Dryer5,000W1 hr (×5/wk)$14$169
Refrigerator150W24 hrs$14$170
EV Charger (Level 2)7,200W8 hrs (×5/wk)$119$1,434
Desktop PC + Monitor200W8 hrs$6.24$75
LED TV 55″100W5 hrs$1.95$24
LED Light Bulb10W6 hrs$0.23$2.84
WiFi Router7.5W24 hrs$0.70$8.44

Frequently Asked Questions

Check the label on the back or bottom of the appliance. It usually shows watts (W) or amps (A). If you see amps: multiply amps by your voltage (120V in the US, 230V in Europe) to get watts. For example, 10A × 120V = 1,200W. You can also use a smart plug with energy monitoring to measure actual usage.
Your rate is on your electricity bill. Look for “unit rate,” “price per kWh,” or “energy charge.” In the US, the average is $0.12–$0.16 per kWh. In the UK it’s around £0.28/kWh. Rates vary by state, region, and supplier. Your exact rate may also change by season or time of day if you’re on a special tariff.
Very accurate when you enter the correct wattage and usage hours. The formula is the same one electricity companies use. The main source of error is estimating usage hours. If you’re unsure, track how long the device runs for a few days and use that average. Smart plugs with energy monitoring give you the most accurate numbers.
Heating and cooling are almost always the most expensive. Central air conditioning can cost over $100/month in summer. Electric water heaters are next, often $40–$80/month. Clothes dryers, electric ovens, and EV charging are also significant. LED lights and small electronics cost almost nothing by comparison. Focus your energy-saving efforts on climate control first.
A kilowatt-hour (kWh) is the standard unit of electrical energy. One kWh is the energy used by a 1,000-watt appliance running for exactly one hour. A hairdryer at 1,000W running for one hour uses 1 kWh. A 100W TV running for 10 hours also uses 1 kWh. Your electricity supplier charges you for every kWh you use.
The biggest wins: (1) Raise your AC thermostat by 2°F in summer — saves 10–15% on cooling. (2) Switch to a heat pump water heater — 2–3× more efficient than standard electric. (3) Use a programmable thermostat. (4) Shift heavy loads (dryer, dishwasher) to off-peak hours. (5) Add insulation to reduce heating and cooling demand. (6) Replace incandescent bulbs with LEDs — they use 75–80% less energy.
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