EV Level 1 & Level 2 Charger Cost Calculator
TL;DR: EV home charging (Level 2) 7,600W × 4h = 30.40 kWh/day = $4.86/day, $97.28/month, $1167.36/year at $0.16/kWh — formula ▸
kWh = watts ÷ 1000 × hours
cost = kWh × rate per kWh
7600 ÷ 1000 × 4 = 30.400 kWh/day
30.400 × 0.16 = $4.86/day| Period | Energy | Cost |
|---|---|---|
| Per hour | 7.600 kWh | $1.22 |
| Per day | 30.40 kWh | $4.86 |
| Per month (20 days) | 608.0 kWh | $97.28 |
Source: ProEnergySaver, calculated at $0.16/kWh (US average). Rates cross-checked against EnergyStar, DOE and Ofgem published figures.
Enter your battery size, target state of charge and local electricity rate to see what a home charge really costs — including the charging losses that make Level 1 (120V) slightly more expensive per session than Level 2 (240V).
Your charging inputs
How EV home charging cost is calculated
The formula is simple: kWh added = battery capacity × (target % − start %), then cost = kWh ÷ charging efficiency × your rate. Level 1 charging typically lands around 85% end-to-end efficiency because the onboard charger and battery management run for far longer, while Level 2 charging is closer to 92%. Both draw the same electricity price per kWh, so Level 2 is cheaper mainly because it wastes less energy and finishes inside cheap overnight off-peak windows.
For a deeper breakdown with regional price tables, read our EV home charging cost guide, or estimate the rest of your household with the home electricity bill estimator.
Power saving devices: do electricity saving boxes actually work?
Does Power Saver Pro electricity saving box actually save electricity?
No. For fake plug-in boxes (StopWatt, Power Saver Pro), savings will be 0 kWh ($0.00) because they do not reduce active power. Residential meters only measure active power (kWh), so improving power factor at home changes nothing on your utility bill. For legitimate power-saving devices (smart power strips, programmable thermostats, timers), use Daily kWh Reduction = (Original Watts x Original Hours - New Watts x New Hours) / 1000, and Monthly Savings ($) = Daily kWh Reduction x 30 Days x Utility Rate per kWh. Example: a TV setup (TV, soundbar, game console) drawing 30 Watts on idle/standby for 20 hours a day is 0.60 kWh/day = $2.88/month at $0.16/kWh. A water heater saving 500W x 1.5h is 0.75 kWh/day = $3.60/month. Verify real-world consumption with a physical power meter such as a Kill A Watt meter.
Is StopWatt energy saving device scam or legit how much does it save?
StopWatt is a complete scam. It saves exactly $0.00. Testing by consumer protection agencies shows it slightly increases your bill because the internal LED draws power. Red flags: "Stabilizes voltage & power factor" (false for residential billing), "Cleans dirty electricity" (marketing buzzword), "Endorsed by Elon Musk / Shark Tank" (100% fake deepfakes), "Cuts bills by 60%" (independent teardowns show only a cheap capacitor and an LED inside). Real savings come from adjusting the thermostat, lowering the water heater to 120°F (49°C), and using smart power strips to eliminate phantom standby loads.
To price a genuine saving, use Daily kWh = Watts × Hours ÷ 1000 in the Real kWh Savings Calculator.
Want regional price tables, off-peak savings, and worked examples for home EV charging?
Read the full guide →More cost calculators
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