How Much Does It Cost to Charge an EV?
EV charging cost formulas, worked 20–80% examples, Level 1 vs Level 2 vs DC fast rates, and home vs public vs gasoline — with the free calculator.
How much does it cost to charge an EV?
Quick answer: charging a typical 75 kWh EV from 20% to 80% at the US average residential rate of about $0.17/kWh (2026) puts 45 kWh into the battery and, with ~10% charging losses, draws 49.5 kWh from the grid — roughly $8.42 per session, or about $14 for a full 0–100% charge. That is approximately 5.3¢ per mile at 3.5 mi/kWh, against 14¢ per mile for a 25 mpg car at $3.50/gallon.
EV charging cost is the product of three things: how much energy moves into the pack (battery size × state-of-charge window), what your utility or network charges per kilowatt-hour, and the overhead you pay on top — charging losses, session fees and idle fees. Everything else is detail.
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EV charging cost formula
Every number below comes from one formula chain (energy in kWh, rate in $/kWh or your currency):
- Energy needed: E = capacity × (target SOC − start SOC) ÷ 100
- Effective energy (grid draw): Eeff = E × (1 + losses ÷ 100) — default 10% on AC, 8% on DC fast
- Cost: total = Eeff × rate + session fee + idle fee
- Time-of-use variant: replace rate with offPeak × share + peak × share + shoulder × share
- Charging time: t = Eeff ÷ charger power (kW); DC charging above 80% is divided by the taper factor because packs slow near full
- Cost per mile: total ÷ (E × efficiency in mi/kWh)
- Monthly: session total × sessions per month
Worked example: 75 kWh, 20→80%, $0.17/kWh
1. Energy into the pack: 75 × (80 − 20) ÷ 100 = 45 kWh.
2. Grid draw with 10% losses: 45 × 1.10 = 49.5 kWh.
3. Cost: 49.5 × $0.17 = $8.42.
4. Time on 11.5 kW Level 2: 49.5 ÷ 11.5 = 4.30 h ≈ 4 h 18 min.
5. Miles covered: 45 × 3.5 = 157.5 mi; cost per mile = 8.42 ÷ 157.5 = 5.3¢.
6. Same miles in a 25 mpg car at $3.50/gal: 157.5 ÷ 25 × 3.50 = $22.05 — the EV saves $13.63 per session.
A full 0–100% charge on the same tariff is 75 × 1.10 × 0.17 = $14.03. Eight sessions a month: $67.32.
Level 1 vs Level 2 vs DC fast charging
Level 1 uses a standard household outlet at about 1.4 kW — roughly 35 hours for the 20–80% example above, so it is really a plug-in-hybrid tool. Level 2 (7.2–19.2 kW) is the home and workplace standard: 2.6–7 hours for the same window. DC fast (50–350 kW) skips the onboard charger and delivers about an hour at 50 kW or roughly 20 minutes at 150 kW — but networks price it at a premium, commonly $0.35–$0.60/kWh.
| Mode | Power | Typical rate | 20–80% time (75 kWh) | 20–80% cost |
|---|---|---|---|---|
| Level 1 | 1.4 kW | home tariff | ~35 hours | $8.42 @ $0.17 |
| Level 2 home | 11.5 kW | home tariff | ~4 h 18 min | $8.42 @ $0.17 |
| Public Level 2 | 7.2–19.2 kW | $0.30–0.50/kWh | ~3–7 hours | $15–25 |
| DC fast 50 kW | 50 kW | $0.35–0.60/kWh | ~1 hour | $17–30 |
| DC fast 150 kW | 150 kW | $0.35–0.60/kWh | ~20 minutes | $17–30 |
Home vs public vs gasoline
Same miles, four modes — 75 kWh battery, 20→80%, 3.5 mi/kWh (157.5 mi per session), 8 sessions a month, gas at 25 mpg and $3.50/gal:
| Mode | Per charge | Per 100 mi | Per month |
|---|---|---|---|
| Home Level 2 @ $0.17/kWh | $8.42 | $5.34 | $67.32 |
| Public Level 2 @ $0.45/kWh | $22.28 | $14.14 | $178.20 |
| DC fast 50 kW @ $0.48/kWh | $23.33 | $14.81 | $186.64 |
| Gasoline — 25 mpg @ $3.50 | $22.05 | $14.00 | $176.40 |
Home charging at 5.3¢ per mile beats gasoline by more than half. Public L2 and DC fast sit near gas parity — you are paying for convenience. Estimates use 2026-plausible US averages; your bill and the network app are ground truth.
What changes your bill
- Tariff — the biggest lever. US residential averaged about $0.17/kWh in 2026; California often exceeds $0.30, Texas sits near $0.15.
- Time-of-use windows — overnight off-peak can be half the peak price. Shift the share of your session into off-peak and the blended rate drops.
- Charging losses — 8–12% of the energy you pay for never reaches the battery; it goes to heat in the charger, cable and pack.
- Session and idle fees — some networks bill a connection fee, or charge per minute for lingering past a full charge.
- Charger level — power changes time, not your home kWh price; on networks, DC fast carries a per-kWh premium.
- Cold weather and taper — cold packs accept energy slowly, and DC charging tapers above ~80%, stretching the clock (the calculator models this with a taper factor).
Frequently Asked Questions
How much does it cost to charge an EV at home?
Charging a 75 kWh EV from 20% to 80% at the US average residential rate of about $0.17/kWh (2026) costs roughly $8–9 including typical 10% charging losses. A full 0–100% charge at that rate is about $14. Home Level 2 charging is almost always the cheapest option per kWh.
How much does it cost to charge an EV at a public charger?
Public Level 2 chargers commonly charge $0.30–$0.50 per kWh, so the same 20–80% session (about 49.5 kWh drawn with losses) costs $15–$25. DC fast chargers run $0.35–$0.60/kWh plus occasional session fees, putting a 20–80% top-up at $17–$30 depending on the network.
How long does it take to charge an EV from 20% to 80%?
On a 7.2 kW Level 2 charger, a 20–80% session on a 75 kWh battery (45 kWh into the pack) takes about 6–7 hours including losses. A 50 kW DC fast charger does it in roughly an hour; a 150 kW unit in about 20 minutes, because charging slows down above 80%.
What is the formula for EV charging cost?
EV charging cost = usable battery capacity (kWh) × SOC change ÷ 100 × electricity rate ($/kWh), multiplied by (1 + charging losses) and plus any session or idle fees: cost = capacity × ΔSOC × (1 + losses) × rate + fees. For 75 kWh, 20→80%, $0.17/kWh and 10% losses: 45 × 1.10 × 0.17 = $8.42.
Is it cheaper to charge an EV at home or at a public charger?
Home charging is cheaper. At $0.17/kWh home power, a 20–80% session costs about $8.42; the same session on a public Level 2 charger at $0.45/kWh costs about $22.28 — roughly 2.6× more. Over eight sessions a month that is about $67 at home versus $178 in public.
How much does it cost to charge an EV per month?
Eight 20–80% home sessions a month on a 75 kWh battery at $0.17/kWh with 10% losses cost about $67 a month — roughly 5.3¢ per mile at 3.5 mi/kWh. Charge only at public rates and the same driving costs $178 or more per month.
Does charging an EV cost more than driving a gas car?
Not at home. At 3.5 mi/kWh and $0.17/kWh, electricity costs about 5.3¢ per mile; a 25 mpg car at $3.50/gallon costs 14¢ per mile — nearly three times more. Public fast charging at $0.45/kWh lands around 14¢ per mile, about the same as gasoline, so home charging is where EVs win.
Do DC fast chargers charge more per kWh?
Usually yes. DC fast charging is commonly $0.35–$0.60 per kWh versus $0.12–$0.20 at home on a residential tariff, and some networks add session fees. DC losses are slightly lower (about 8% versus 10% for AC), but not enough to offset the higher rate.