EV Home vs Public Charging Cost Calculator
Compare annual EV charging costs at home vs public Level 2 and DC fast chargers from battery kWh and weekly miles.
Returns cost per mile and yearly savings.
The economics of EV charging
One of the biggest reasons people buy electric vehicles is the lower per-mile fueling cost. But not all charging is equally cheap — public DC fast chargers can cost 3-5x more per kWh than home electricity. Where you charge matters enormously to your total cost of EV ownership.
For typical drivers (12,000-15,000 miles/year), the difference between exclusively home charging and exclusively public fast charging can be $1,000-$2,500 per year.
The cost calculation formula
Monthly kWh needed = Miles driven ÷ Vehicle efficiency (mi/kWh) Monthly charging cost = kWh × Rate per kWh Cost per mile = Rate per kWh ÷ Efficiency
Worked example: 1,000 miles/month, 3.5 mi/kWh efficiency, $0.13/kWh home rate:
- kWh: 1,000 ÷ 3.5 = 286 kWh
- Monthly cost: 286 × $0.13 = $37.18
- Cost per mile: $0.13 ÷ 3.5 = $0.037/mile
For comparison, a 25 MPG gas car at $3.50/gallon:
- 1,000 miles ÷ 25 = 40 gallons
- Cost: 40 × $3.50 = $140
- Cost per mile: $0.14/mile
Home EV charging is 3-4x cheaper per mile than equivalent gas vehicles.
Charging levels explained
EVs charge at three main “levels”:
Level 1 (120V household outlet):
- Speed: 3-5 miles of range per hour
- Charges 30-50 miles in 8-10 hours overnight
- Free (you already pay for the outlet)
- Best for: PHEVs (plug-in hybrids), short daily commutes
- Cable: included with car
Level 2 (240V home or public charger):
- Speed: 20-30 miles of range per hour
- Charges 200-300 miles overnight
- Home: $500-2,000 installation
- Public: usually $0.20-$0.40/kWh
- Best for: daily charging for most EV owners
- Cable: separate purchase or include with car
DC Fast Charging (DCFC):
- Speed: 100-300+ miles of range per hour
- Charges 80% in 20-40 minutes
- Cannot install at home (commercial only)
- Usually $0.35-$0.60/kWh
- Best for: road trips, occasional use
- Connectors: CCS (most non-Tesla), CHAdeMO (older), NACS (Tesla, now becoming universal)
Tesla Superchargers (special case):
- V2: ~150 kW (older sites)
- V3: 250 kW (most current)
- V4: 350 kW (newest)
- Now opening to non-Tesla vehicles in many regions
- Generally cheaper than third-party DC fast chargers ($0.25-$0.45/kWh)
Typical electricity rates by source
Approximate US rates (2024):
| Source | Rate range | Notes |
|---|---|---|
| Home (residential) | $0.10-$0.30/kWh | Varies by state — TX $0.10, CA $0.30+ |
| Home (time-of-use night) | $0.06-$0.15/kWh | Off-peak EV rates from many utilities |
| Workplace charging (free) | $0/kWh | Employer benefit |
| Workplace charging (paid) | $0.10-$0.20/kWh | Often subsidized |
| Public Level 2 | $0.20-$0.40/kWh | Variable by network |
| DC Fast Charger (off-brand) | $0.35-$0.60/kWh | Most public networks |
| Tesla Supercharger | $0.25-$0.45/kWh | Often cheaper than alternatives |
| EVgo | $0.32-$0.43/kWh | Plus session fees sometimes |
| ChargePoint | $0.20-$0.50/kWh | Variable by location |
| Electrify America | $0.31-$0.43/kWh | Often Premium/Pass+ savings |
Rates vary substantially by location and time of day. Always check the specific charger.
State-level variation
US electricity rates vary dramatically:
| State | Avg residential rate ($/kWh) |
|---|---|
| Hawaii | $0.42 |
| California | $0.30 |
| Connecticut | $0.28 |
| New York | $0.21 |
| Massachusetts | $0.27 |
| Texas | $0.13 |
| Washington | $0.10 |
| Idaho | $0.09 |
| Louisiana | $0.10 |
| Oklahoma | $0.11 |
| US average | $0.16 |
EV economics are dramatically better in states with cheap electricity (TX, WA, ID) vs expensive states (HI, CA, CT).
The home charging breakeven
For most drivers, installing Level 2 at home pays back quickly:
Setup costs:
- Level 2 charger hardware: $200-1,200
- Electrical work (240V circuit): $300-1,500
- Permit fees: $50-200
- Total: $500-2,500
Annual savings vs Level 1 only:
- Faster charging means more driving
- Time-of-use night rates often save 30-50%
Annual savings vs public DC fast charging:
- Typical: $1,000-$2,500/year for average driver
- Payback period: 6-30 months typically
For an EV owner driving 15,000+ miles/year, home Level 2 is almost always worth it.
Vehicle efficiency comparison
Different EVs have different efficiencies:
| EV | Efficiency (mi/kWh) |
|---|---|
| Hyundai Ioniq 6 RWD | 4.0 |
| Tesla Model 3 Standard Range | 3.8 |
| Lucid Air Pure | 3.6 |
| Hyundai Kona Electric | 3.5 |
| Nissan Leaf | 3.5 |
| Tesla Model Y Long Range | 3.3 |
| Ford Mustang Mach-E | 3.0 |
| Chevy Bolt EV | 3.5 |
| Audi e-tron | 2.4 |
| Hummer EV | 1.6 |
| Rivian R1T | 2.2 |
| GMC Hummer EV | 1.5 |
A 2.2x difference between most and least efficient EVs translates to 2.2x the energy cost per mile.
Battery cost vs charging cost confusion
Some EV owners worry about battery wear from fast charging. Reality:
- DC fast charging degrades batteries faster than Level 1/2 charging
- But the difference is modest for occasional use (road trips)
- Frequent DC fast charging shortens battery life noticeably
- Tesla, Hyundai, Kia limit Tesla Supercharger access for many high-mileage users
For daily charging: Level 1 or 2. DC fast charging only for trips.
Time-of-use (TOU) rates
Most utilities offer EV-specific rates:
Off-peak times: usually 9 PM - 7 AM Off-peak rates: $0.06-$0.15/kWh (50-70% cheaper than standard) Peak rates: $0.20-$0.40/kWh (often higher than standard rates)
For typical EV owners, switching to TOU rates saves $200-800/year. Most EVs can be programmed to charge only during off-peak hours.
Public charging networks
Major US networks:
Tesla Supercharger:
- Pros: cheapest, most reliable, fastest (V3/V4)
- Cons: was Tesla-only, now opening to others
- Coverage: best US/Canadian coverage
Electrify America:
- Pros: high-speed (150-350 kW), wide coverage
- Cons: variable reliability, higher prices
- Coverage: well-established US network
ChargePoint:
- Pros: many slow chargers (Level 2)
- Cons: speed varies dramatically by station
- Coverage: largest network by stations
EVgo:
- Pros: dedicated DC fast network
- Cons: often older, slower stations
- Coverage: focused on major metros
Free chargers (workplace, hotels, restaurants):
- Increasingly common
- Free to use, slow Level 2
- Worth seeking out for daily driver
Road trip charging strategy
For long-distance EV travel:
- Map route on PlugShare or app: find DC fast chargers
- Aim for 80% charge stops: faster than going to 100%
- Charge when below 30%: gives flexibility
- 15-30 minute stops: align with bathroom breaks
- Premium routes: Supercharger network for Tesla owners
- Backup chargers identified: in case primary is full/broken
Typical Tesla Model 3 road trip: 2-3 hours driving, 15-20 minute charging, repeat.
Common EV charging mistakes
- Charging to 100% daily: shortens battery life — charge to 80% for daily use
- Frequent DC fast charging: degrades battery; use Level 2 daily
- No home charging: relying entirely on public is expensive
- Wrong charge schedule: charging during peak rates
- Premium charging only: not seeking free workplace/hotel chargers
- Wrong charger speed: paying for fast when slow would suffice
- Long-trip planning failures: not researching charger locations
- Cold weather optimism: range drops 20-40% in cold weather
- Not pre-conditioning: starting a fast charge with cold battery slow
- Connector type confusion: not all chargers work for all cars
Bottom line
EV charging cost = (Miles ÷ Efficiency) × Rate. Home charging: $0.10-$0.30/kWh — cheapest option. DC fast charging: $0.35-$0.60/kWh — convenient but expensive. Per-mile cost: home charging is 3-4x cheaper than gas; DC fast charging is comparable to gas. Vehicle efficiency varies 2x between models (1.6 mi/kWh Hummer EV vs 4.0 mi/kWh Ioniq 6). Time-of-use rates save 30-70% vs standard. Home Level 2 setup costs $500-2,500 but typically pays back in 6-30 months. For road trips, use DC fast charging. For daily driving, Level 2 home charging is optimal. State electricity rates matter: TX/WA cheap, HI/CA expensive.