How do I calculate my monthly electricity bill from watts and hours?

Monthly kWh = (Watts × Hours per day × 30) ÷ 1,000. Monthly cost = kWh × rate per kWh. Example: 1,500W space heater, 4 hours/day: (1,500 × 4 × 30) / 1,000 = 180 kWh × $0.16 = $28.80/month. Sum all appliances for your total estimated bill.

Is an EV cheaper than a gas car per mile?

Yes. EV at $0.16/kWh and 3.5 miles/kWh = $0.046/mile. Gas vehicle at 28 MPG and $3.50/gallon = $0.125/mile — EVs are about 63% cheaper per mile on fuel. Off-peak home charging further reduces EV cost to ~$0.023/mile.

What is the solar panel payback period in the US?

Average US solar payback: 6–10 years (2026) after the 30% federal ITC. A 6 kW system at $18,000 gross → $12,600 net cost. Producing ~7,884 kWh/year saves ~$1,261/year at $0.16/kWh → ~10-year payback. After payback, panels generate free electricity for 15–20 more years.

🛠️ Everyday UtilitiesLast updated May 3, 2026

Energy & Utility Cost Guide 2026: Electricity, BTU, Fuel, EV, Solar & Home Efficiency

Cut utility bills and optimize energy efficiency — data-driven tools and expert guidance

U0001F9EE

Free Calculators

⚡

$137/mo

Avg. US Electric Bill

U0001F4B0

$2,000/yr

Avg. US Gas Spend

⏱️

16 min

Read Time

💡

Key Takeaways

Electricity cost formula: (Watts × Hours per day × 30) ÷ 1,000 × rate per kWh = monthly cost. At the US average of $0.16/kWh (2026), a 100-watt bulb running 8 hours/day costs $3.84/month.
Top electricity users in a typical home: HVAC (46%), water heater (14%), washer/dryer (13%), lighting (9%), refrigerator (4%). Targeting HVAC first yields the biggest bill reductions.
BTU sizing rule of thumb: 20 BTU per sq ft for cooling; 30–40 BTU per sq ft for heating in cold climates. A 1,500 sq ft home needs ~30,000 BTU (2.5-ton) AC and ~45,000–60,000 BTU furnace.
Fuel cost per mile = gas price ($) ÷ MPG. At $3.50/gal and 30 MPG: $0.117/mile. At $3.50/gal and 50 MPG (hybrid): $0.07/mile. EVs at $0.16/kWh and 3.5 miles/kWh: $0.046/mile.
Electric vehicles cost 60–75% less per mile to fuel than gasoline vehicles at current average prices. Over 100,000 miles, the fuel savings can exceed $5,000–$8,000.
Solar panel payback period: Average 6–8 years (2026) with federal 30% ITC. A 6 kW system costs ~$15,000–$18,000 installed; generates ~7,200–8,400 kWh/year; saves $1,152–$1,344/year at $0.16/kWh.
Time-of-use (TOU) electricity pricing: peak hours (4–9 PM weekdays) can cost 2–3× the off-peak rate. Shifting EV charging, dishwashers, and laundry to off-peak hours saves 20–40% on those loads.
SEER rating (Seasonal Energy Efficiency Ratio): the higher the SEER, the more efficient. Minimum 2026 federal standard: 15 SEER2 (North), 15 SEER2 (South). Upgrading from SEER 10 to SEER 20 cuts AC energy use by 50%.
Vampire power (standby loads): TVs, game consoles, cable boxes, chargers, and smart speakers draw 5–20W when not in use. The average US home wastes $100–$200/year on standby power. Smart power strips eliminate this.
Natural gas is typically 2–3× cheaper per BTU than electricity for heating. At $0.16/kWh electricity and $1.50/therm gas (1 therm = 100,000 BTU), gas costs ~$14.30/MMBtu vs electricity ~$46.90/MMBtu for resistance heating (heat pumps change this equation significantly).

Energy costs are one of the largest recurring household expenses — the average US household spent $2,000+ on energy in 2025. This 2026 guide, grounded in data from the U.S. Energy Information Administration (EIA), Energy.gov, and EPA energy programs, covers everything you need to understand and reduce your energy spending: how to calculate your electricity bill by appliance, BTU sizing for heating and cooling, fuel cost analysis, EV vs gas comparison, solar payback, time-of-use pricing strategy, and home energy audit essentials — with free calculators including our electricity cost calculator, BTU calculator, fuel cost calculator, and gas mileage calculator.

⚡

How to Calculate Your Electricity Bill by Appliance

Core formula: Monthly kWh = (Watts × Daily hours × 30) ÷ 1,000. Monthly cost = kWh × rate/kWh. The US average electricity rate is $0.16/kWh in 2026 (EIA data), but ranges from $0.10/kWh (Louisiana) to $0.43/kWh (Hawaii). Top household energy consumers by share: HVAC 46%, water heating 14%, washer/dryer 13%, lighting 9%, refrigerator 4%, other appliances 14%. High-impact targets: Run AC at 78°F (each degree lower adds ~3–5% cost). Replace 60W incandescent with 9W LED: saves $8.50/year per bulb (3 hrs/day). Wash clothes in cold water. Use dishwasher only when full. Annual average US household bill: ~$1,650/year (870 kWh/month × 12 × $0.158). Use our electricity cost calculator to itemize every appliance.

U0001F551

Time-of-Use (TOU) Electricity Pricing: Save 20–40% by Shifting Loads

TOU rates charge more during high-demand peak hours and less during off-peak hours. Typical structure: Peak (4–9 PM weekdays): $0.25–$0.45/kWh. Off-peak (9 PM–6 AM + weekends): $0.08–$0.12/kWh. Super-off-peak (11 PM–6 AM): as low as $0.05/kWh in some utilities. Savings strategies: (1) EV charging after 9 PM: saves $400–$600/year for average EV. (2) Smart thermostat pre-cooling: cool to 74°F by 3 PM, let rise to 78°F during peak. (3) Schedule dishwasher, washer, dryer for after 9 PM. (4) Smart water heater: heat during off-peak only. (5) Demand response enrollment: utilities pay bill credits for reducing load during grid events. Available from: PG&E, SDG&E, Con Edison, Duke Energy, and most major utilities. Best for: households with EVs, pools, hot tubs, or large HVAC systems.

U0001F321️

BTU & HVAC Sizing: Cooling, Heating & Ventilation

BTU (British Thermal Unit) measures energy — 1 BTU = energy to raise 1 lb of water 1°F. For HVAC: 12,000 BTU/hr = 1 ton of cooling. Cooling sizing chart: 500 sq ft → 10,000 BTU. 750 sq ft → 14,000 BTU. 1,000 sq ft → 18,000 BTU. 1,500 sq ft → 24,000 BTU. 2,000 sq ft → 34,000 BTU. 2,500 sq ft → 42,000 BTU. 3,000 sq ft → 50,000 BTU. Adjustment factors: +10% sunny/poorly insulated rooms; +4,000 BTU for kitchens; +600 BTU per person (beyond 2); +10% high ceilings. Heating sizing: 25–45 BTU/sq ft depending on climate zone (DOE zones 1–5). SEER vs SEER2: SEER2 is the new 2023+ standard; SEER2 ≈ SEER ÷ 1.05. Minimum 2026 federal: 15 SEER2 split systems, 14 SEER2 packaged systems. Use our BTU calculator for precise HVAC sizing.

U0001F31F

SEER Ratings & Energy Star: How Efficiency Translates to Savings

SEER (Seasonal Energy Efficiency Ratio) = Total cooling output (BTU) ÷ Total electric input (Wh) over a cooling season. Higher SEER = more efficient. Annual savings calculator: Annual kWh = (Cooling BTUs ÷ SEER) × hours. Example: 36,000 BTU AC, 750 hrs/year. SEER 10: 3,600 kWh = $576. SEER 16: 2,250 kWh = $360. SEER 20: 1,800 kWh = $288. Savings from SEER 10→16: $216/year; from SEER 10→20: $288/year. Energy Star qualification: Central AC: ≥15 SEER2. Heat pump: ≥15 SEER2, ≥8.8 HSPF2. Refrigerator: 10–15% more efficient than federal minimum. HSPF (Heating Seasonal Performance Factor): higher = better heat pump heating efficiency. HSPF2 ≥8.8 is Energy Star. Inverter-driven variable-speed systems: best efficiency AND comfort (variable output matches load precisely).

⛽

Fuel Costs, MPG & Transportation Economics

Core fuel cost formulas: Cost per mile = Gas price ÷ MPG. Trip cost = (Miles ÷ MPG) × Gas price. Annual fuel cost = (Annual miles ÷ MPG) × Gas price. 2026 comparisons at $3.50/gal, 12,000 miles/year: 20 MPG SUV: $2,100/year. 30 MPG sedan: $1,400/year. 50 MPG hybrid: $840/year. 60 MPG hybrid: $700/year. EV at $0.16/kWh, 3.5 mi/kWh: $549/year. True cost of commuting: Include tolls, parking, maintenance (gas cars: ~$0.10/mile; EVs: ~$0.06/mile). MPG declines ~10–25% in city vs highway driving. Cold weather reduces EV range 20–40%. AAA tracks real-time national gas prices. Use our fuel cost calculator and gas mileage calculator.

U0001F50B

EV vs Gas Car: Total Cost of Ownership Comparison

Fuel cost comparison (2026 US averages): Gasoline: $0.125/mile (28 MPG, $3.50/gal). EV home charging off-peak: $0.023/mile ($0.08/kWh, 3.5 mi/kWh). EV home charging average rate: $0.046/mile ($0.16/kWh). EV public fast charging: $0.100/mile ($0.35/kWh). Annual savings (12,000 miles, home charging): $552 vs $1,500 gas = $948/year savings. Maintenance savings: EVs save ~$500–$900/year (no oil changes, fewer brake jobs due to regenerative braking, no timing belt, no transmission service). Depreciation note: Top-selling EVs (Tesla Model 3/Y, Chevy Bolt) now hold value comparably to similar gas models. Federal tax credit: Up to $7,500 for qualifying new EVs (IRS Form 8936). Total cost crossover typically occurs within 3–5 years depending on purchase price premium and driving habits. Use our electricity cost calculator to model EV charging costs.

☀️

Solar Panel Payback Period: Calculation, Incentives & ROI

Payback period formula: Payback years = Net system cost ÷ Annual electricity savings. Step-by-step 2026 example: (1) Gross cost: $18,000 for 6 kW system. (2) Federal 30% ITC: -$5,400. Net cost: $12,600. (3) State incentives (varies): $500–$2,000 additional. (4) Annual production: 6 kW × 4.5 peak sun hrs × 365 days × 0.80 (efficiency) = 7,884 kWh/year. (5) Annual savings: 7,884 × $0.16 = $1,261/year. (6) Payback: $12,600 ÷ $1,261 = ~10 years. Net metering: Excess solar fed to grid earns bill credits (varies by utility — 1:1 net metering is most favorable; NEM 3.0 in California pays less for exports). Long-term ROI: Panels last 25–30 years; after payback you generate ~$1,200/year free electricity. 25-year NPV often $15,000–$25,000+. Best states for solar ROI: California, Arizona, Florida, Texas, Colorado (combination of sun + high rates + incentives).

U0001F525

Natural Gas vs Electric Heating: Cost-Per-BTU Comparison

Cost comparison (2026 US averages): Natural gas: $1.50/therm (1 therm = 100,000 BTU). 80% efficient gas furnace: $1.50 / (100,000 × 0.80) = $18.75/MMBtu. 95% efficient gas furnace: $1.50 / (100,000 × 0.95) = $15.79/MMBtu. Electric resistance at $0.16/kWh: $0.16 / 3,412 BTU = $46.90/MMBtu. Heat pump COP 3.0 at $0.16/kWh: $46.90 / 3 = $15.63/MMBtu — beats gas. Heat pump COP 2.0 (cold climate, -10°F): $46.90 / 2 = $23.45/MMBtu — pricier than gas. Propane: ~$2.50/gallon, 91,500 BTU/gallon = $27.32/MMBtu at 100% efficiency — most expensive. Cold-climate heat pumps (Mitsubishi Hyper Heat, Bosch, Daikin) maintain COP 1.5–2.0 down to −13°F, making them cost-competitive with gas in most US climates. Heat pump water heaters (HPWH): COP 3.0–4.0 — cut water heating bills 50–70% vs electric resistance.

U0001F9DB

Vampire Power & Standby Loads: The Hidden $100–$200/Year Waste

Standby power is electricity drawn by devices when not actively in use. US average household wastes $100–$200/year. Common vampire loads: Cable/satellite box: 15–17W (always on) = $21–24/year. Game console (always-on mode): 10–15W = $14–21/year. 65" smart TV (standby): 1–0.5W. Desktop PC + monitor (sleep): 2–5W each. Phone/laptop chargers (plugged in): 0.5–1W each. Laser printer: 5–10W standby. Smart speakers (Alexa/Google): 1.5–3W continuous. Solutions: Smart power strips: cut power to peripheral devices when TV/PC off — $15–30. Smart plugs with schedules: automate off-hours. Unplug chargers when not in use. ENERGY STAR devices consume <0.5W standby. Advanced power strip with occupancy sensing. Quick test: Measure household standby with a Kill-A-Watt meter ($25) — most homes find 200–500W always-on draw.

U0001F3E0

Home Energy Audit: Top Checks to Cut Bills 20–30%

DIY audit checklist: (1) Air sealing: check doors/windows for drafts (use incense stick or thermal leak detector). Caulk and weatherstrip gaps — can save 10–20% on HVAC. (2) Attic insulation: measure depth. Code minimum R-38 to R-60 for most climates. Underfilled attics are #1 heat loss culprit. (3) HVAC filter: replace every 1–3 months. Clogged filter reduces efficiency 5–15%. (4) Water heater: set to 120°F (factory often set at 140°F; each 10°F lower saves 3–5%). (5) Duct sealing: flex duct leaks waste 20–30% of conditioned air. Mastic sealant or foil tape (not duct tape). (6) Appliance age: refrigerators/dishwashers older than 15 years likely use 2× the energy of new Energy Star models. (7) Lighting: 100% LED saves ~$150/year for avg home. (8) Professional audit: utility blower door test + thermal imaging ($150–$500, often subsidized by utilities). Typical result: 20–30% whole-home energy reduction. Most improvements pay back in 2–5 years.

🧮

How to calculate payback, federal ITC, net metering, and best states for solar ROI.

blog →

❓

Frequently Asked Questions

How do I calculate my monthly electricity bill by appliance?

Step 1: Find the wattage on each appliance (label or manual). Step 2: Estimate daily hours of use. Step 3: Monthly kWh = (Watts × Hours/day × 30) ÷ 1,000. Step 4: Multiply by your rate per kWh (find on your utility bill). Example: 1,200W microwave, 0.5 hours/day: (1,200 × 0.5 × 30) / 1,000 = 18 kWh × $0.16 = $2.88/month. Sum all appliances for your total estimated bill. Our electricity cost calculator automates all steps.

How many BTU do I need per square foot for air conditioning?

General rule: 20 BTU per square foot for typical cooling. Adjustments: add 10% for high ceilings (>8 ft), add 4,000 BTU for kitchens, add 10% for very sunny rooms, add 600 BTU per additional person beyond 2. Examples: 500 sq ft = 10,000 BTU; 1,000 sq ft = 18,000–20,000 BTU; 1,500 sq ft = 24,000–30,000 BTU; 2,000 sq ft = 34,000–40,000 BTU. Oversizing causes short cycling (poor dehumidification); undersizing can’t maintain temperature on hot days.

How do I calculate fuel cost per mile for any vehicle?

Formula: Cost per mile = Gas price ($) ÷ MPG. For a trip: Trip fuel cost = (Distance ÷ MPG) × Gas price. Examples: 30 MPG at $3.50/gal = $0.117/mile; 25 MPG at $3.80/gal = $0.152/mile; 50 MPG hybrid at $3.50/gal = $0.07/mile. For monthly: (Monthly miles ÷ MPG) × gas price. Our fuel cost calculator includes all these scenarios plus EV comparison.

Is an EV cheaper than a gas car to fuel?

Yes, significantly. At US averages (2026): Gas vehicle: 28 MPG, $3.50/gal = $0.125/mile. EV: 3.5 miles/kWh, $0.16/kWh = $0.046/mile — 63% savings. Annual difference (12,000 miles): Gas $1,500 vs EV $552 = $948/year savings. Charging at home during off-peak TOU hours (~$0.08/kWh) cuts EV cost to $0.023/mile — 82% savings vs gas. Public fast charging (~$0.35/kWh) erodes savings significantly.

How do I calculate solar panel payback period?

Step 1: System cost after 30% federal ITC (Investment Tax Credit). Example: $18,000 installed × 0.70 = $12,600 net cost. Step 2: Annual kWh production = system size (kW) × peak sun hours/day × 365. Example: 6 kW × 4.5 hours × 365 = 9,855 kWh. Step 3: Annual savings = kWh produced × electricity rate. 9,855 × $0.16 = $1,577. Step 4: Payback = Net cost / Annual savings = $12,600 / $1,577 = ~8 years. After payback, panels generate free electricity for 15–20+ more years.

What is time-of-use (TOU) pricing and how can I save with it?

TOU pricing charges different rates depending on time of day. Peak hours (typically 4–9 PM weekdays): $0.25–$0.45/kWh. Off-peak (nights, weekends): $0.08–$0.12/kWh. Super-off-peak (late night): as low as $0.05/kWh. Savings strategy: shift EV charging to after 9 PM or midnight (saves $400–$600/year on EV). Run dishwasher, washer/dryer at night. Use a smart thermostat to pre-cool/heat during off-peak hours. Program timers on water heaters. Participating in demand response programs can earn bill credits.

Is natural gas or electricity cheaper for home heating?

It depends on efficiency. Resistance electric heating (baseboard): 100% efficient. Heat pump: 200–350% efficient (COP 2–3.5). Gas furnace: 80–98% AFUE. At US averages (2026): Resistance electric at $0.16/kWh = ~$47/MMBtu. Natural gas at $1.50/therm, 80% efficient furnace = ~$18.75/MMBtu. High-efficiency heat pump (COP 3.0) = ~$15.70/MMBtu — beats gas. Cold climate heat pump (COP 2.0) = ~$23.50/MMBtu — slightly more expensive than gas. Gas is cheaper for resistance comparison; heat pumps are now the most efficient option in most US climates.

What are the biggest energy wasters in a home?

By category: (1) HVAC leaks: poorly sealed ducts waste 20–30% of conditioned air. (2) Insulation gaps: attic insulation below R-30 loses significant heat/cooling. (3) Vampire loads: $100–$200/year from standby devices. (4) Old appliances: a 2005-era refrigerator uses 600–800 kWh/year vs 400 kWh for a 2024 Energy Star model. (5) Water heater: set to 140°F (reduce to 120°F saves 4–22%). (6) Incandescent bulbs: 60W incandescent replaced by 9W LED saves $8.50/year per bulb at 3 hours/day. (7) Single-pane windows: up to 30% of heating/cooling loss in older homes.

How much does it cost to run common appliances per day?

At $0.16/kWh US average: Central AC (3 ton, 3,500W, 8 hrs): $4.48/day. Space heater (1,500W, 8 hrs): $1.92/day. Electric water heater (4,500W, 3 hrs): $2.16/day. Refrigerator (150W, 24 hrs): $0.58/day. Washing machine (500W, 1 hr): $0.08/load. Dryer (5,000W, 1 hr): $0.80/load. Dishwasher (1,800W, 1.5 hrs): $0.43/cycle. 65" TV (100W, 5 hrs): $0.08/day. Desktop PC (200W, 8 hrs): $0.26/day. EV charging (11.5 kW, 4 hrs): $7.36 per charge session at home.

What SEER rating should I look for in a new air conditioner?

SEER2 (the updated standard as of 2023) minimum requirements: 15 SEER2 in northern states; 15 SEER2 in southern states. Recommended for new purchases: 16–20 SEER2 for best payback balance. Example savings: If your current AC is SEER 10 and you upgrade to SEER 20: energy use cut 50%. On a $1,200/year cooling bill, savings = $600/year. Payback on a $2,000 premium for higher SEER: ~3.3 years. SEER 20+ (inverter-driven variable-speed units) provide additional comfort benefits: better humidity control and quieter operation.

Ready to Calculate?

Browse our complete tools calculator suite — free, instant, and trusted by professionals worldwide.

Browse Tools Calculators All Guides