How to Read Your Electric Bill
Quick breakdown
- kWh = kilowatt-hours, the unit your meter counts. 1 kWh = running a 1000 W device for 1 hour.
- Rate ($/kWh) = what you pay per unit of energy. US average is around $0.13–$0.18/kWh.
- Your bill = kWh used × rate + fixed charges (meter fee, distribution, taxes).
- Big number on the bill? kWh used × your rate = the energy portion. Fixed charges are typically $10–25/month regardless of use.
Canadian reader? Use province-specific guides: Ontario hydro bill, British Columbia hydro bill, and Alberta electricity bill, and Hydro-Quebec Rate D.
What is a kilowatt-hour (kWh)?
A kilowatt-hour is the fundamental unit your electric meter counts. It represents 1000 watts running for 1 hour, or any other combination that multiplies to the same energy: 100 W for 10 hours, 500 W for 2 hours, and so on.
The formula: kWh = (watts × hours) ÷ 1000
Examples:
- A 1500 W space heater running 3 hours = 4.5 kWh
- A 100 W bulb running 10 hours = 1 kWh
- A 5000 W electric dryer running 1 hour = 5 kWh
Your meter counts every kWh that flows through it. At the end of the billing period, your utility reads the meter, subtracts the previous reading, and multiplies the difference by your rate.
The rate: what you pay per kWh
Your electric rate is the price per kWh of energy. In the US, this ranges roughly from $0.09/kWh in the cheapest states to over $0.30/kWh in the most expensive (notably Hawaii and California). The national average in 2025 is around $0.16/kWh for residential customers.
Your rate may not be a single flat number. Many utilities use:
- Flat rate: Same price per kWh no matter how much you use.
- Tiered rate: Cheaper per kWh for the first X kWh/month, more expensive above that threshold.
- Time-of-use (TOU) rate: Price varies by time of day, cheaper overnight, more expensive during peak hours (typically 4–9 PM). If you are on TOU pricing, when you use energy matters as much as how much you use.
Find your rate on your bill; look for a line that says "energy charge" or "per kWh" next to a dollar amount. Divide your total energy charge by your kWh used to get your effective rate.
The fixed charges (the part that doesn't change)
Even if you used zero electricity, your bill would not be zero. Fixed charges appear under several names depending on your utility:
- Customer charge / meter fee: A flat monthly fee for having service, typically $5–20/month.
- Distribution charge: Cost to maintain the local grid, may be a flat fee or a per-kWh charge.
- Transmission charge: Cost to move electricity from generators to your area, usually per-kWh.
- Taxes and fees: State and local taxes, utility regulatory fees, renewable energy programs, and similar line items.
These fixed charges can make up $15–30 of a typical bill regardless of consumption, which is why reducing energy use has diminishing returns, you'll always pay at least that base amount.
How to calculate your own bill estimate
Before the bill arrives, you can estimate what it will say:
- List your major appliances, their wattage, and typical daily hours of use.
- Calculate kWh per month:
(watts × hours/day × days) ÷ 1000 - Add up all appliances to get total monthly kWh.
- Multiply by your rate.
- Add fixed charges from your previous bill.
Use the Electricity Cost Calculator to run this math for individual appliances, then add them up manually for a household total.
Reference: typical monthly kWh by appliance
| Appliance | Typical wattage | Assumed daily use | Monthly kWh (approx.) |
|---|---|---|---|
| Refrigerator | ~150 W avg | 24 h (cycling) | ~50–80 kWh |
| Electric water heater | 4500 W | ~3 h (cycling) | ~100–150 kWh |
| Central AC (2 ton) | ~2000 W | 8 h (summer) | ~480 kWh/month (summer) |
| Electric dryer | 5500 W | ~1 h (5×/week) | ~110 kWh |
| Space heater | 1500 W | 4 h | ~180 kWh |
| TV + devices | ~100 W avg | 5 h | ~15 kWh |
| Lighting (LED) | ~50 W total | 6 h | ~9 kWh |
These are rough averages. Your actual usage depends on equipment age, climate, habits, and how well your home is insulated.
Reading the bill: where to look
Bills vary by utility, but most include these sections:
- Account summary: Total amount due and due date.
- Meter reading: Current and previous reading in kWh (the difference is your monthly usage).
- Usage graph or history: Many utilities show the last 12 months of usage, useful for spotting seasonal patterns or an unusual spike.
- Charge detail: Itemized breakdown of energy charge, distribution, transmission, and fees.
- Rate information: Your rate schedule name (e.g., "Residential Rate R-1") and $/kWh for each tier.
If your bill shows multiple rate tiers, the first block of kWh is billed at rate 1, anything above the tier threshold is billed at rate 2. Identifying which tier your usage falls in helps you understand the effective cost of reducing consumption.
Related tools and guides
- How to Read Your Hydro Bill in Ontario
- How to Read Your Hydro Bill in British Columbia
- How to Read Your Electric Bill in Alberta
- How to Read Your Hydro-Quebec Bill (Rate D)
- Electricity Cost Calculator, estimate cost per appliance
- kWh Calculator, calculate energy use from watts and hours
- Why Is My Electric Bill So High?
- How to Find Appliance Wattage
- Electricity Basics
FAQ
What is the difference between kW and kWh?
kW (kilowatts) is the rate of power use, how fast energy is being consumed right now. kWh (kilowatt-hours) is the total energy consumed over time, what your meter measures and what your bill charges you for. A 1000 W (1 kW) appliance running for 2 hours uses 2 kWh.
Why is my bill different from the same month last year?
The most common reasons: a change in how much you used (different weather, new appliances, longer showers), a rate increase from the utility, or both. Check your bill's usage history, if kWh is similar but dollars are up, your rate increased. If kWh is higher, look for what changed in your usage.
What is the "fuel adjustment charge" or "energy cost adjustment"?
Many utilities pass through their fuel costs to customers as a variable charge separate from the base rate. When natural gas or coal prices rise, this charge increases your effective per-kWh cost. When fuel prices fall, it decreases. It is usually a small per-kWh adder on top of the base rate.
Is my meter accurate?
Electric meters are tested and calibrated by utilities and are rarely significantly wrong. If you suspect an error, you can verify by calculating expected kWh from your known appliances and comparing to your meter reading over a billing cycle. Most utilities also offer meter tests upon request, sometimes for a fee.
What is demand charge, and does it apply to me?
Demand charges are based on your highest power draw (in kW) during the billing period, not just total energy used. They are common for commercial and industrial customers and are increasingly appearing in some residential rate structures. If your bill mentions "demand" or "kW demand," check your rate schedule, running high-wattage devices simultaneously can trigger a higher demand charge.
Disclaimer: Results are informational estimates for learning and planning only. Always follow the applicable electrical code and consult a qualified licensed electrician for safety-critical work.