EV Charging Cost Calculator (Massachusetts Electricity Rates)

Estimate your EV charging costs in Massachusetts using current residential electricity rates. Enter your vehicle's battery capacity, charging frequency, and efficiency to see daily, monthly, and annual cost projections.

Full usable battery capacity of your EV (e.g., Tesla Model 3 Long Range = 75 kWh)
How much battery percentage you typically add per charging session (e.g., 20% to 80% = 60%)
How many times per week you charge your EV at home
Level 2 chargers are ~90–95% efficient; Level 1 chargers ~85–90%
Massachusetts average residential rate ≈ 23.4 ¢/kWh (2024). Check your utility bill for your exact rate.
Your EV's efficiency rating (e.g., Tesla Model 3 ≈ 4.0, Chevy Bolt ≈ 3.5, F-150 Lightning ≈ 2.3)

Formulas Used

Grid kWh per session:
Grid kWh = Battery Size (kWh) × (Charge Level Added % / 100) / (Charger Efficiency % / 100)

Cost per session:
Cost ($) = Grid kWh × Electricity Rate (¢/kWh) / 100

Weekly / Monthly / Annual cost:
Weekly = Cost per Session × Sessions per Week
Monthly = Weekly × 4.345 (avg weeks/month)
Annual = Weekly × 52

Miles per session:
Miles = Battery Size × (Charge Level % / 100) × Vehicle Efficiency (miles/kWh)

Cost per mile:
Cost/mile = Cost per Session / Miles per Session

Gasoline comparison:
Gas Cost/100 mi = (100 / MPG) × Gas Price per Gallon
Annual Savings = Annual Gas Cost − Annual EV Charging Cost

CO₂ avoided:
EV CO₂ = Annual Grid kWh × 0.28 lbs CO₂/kWh (MA ISO-NE 2023)
Gas CO₂ = (Annual Miles / MPG) × 19.6 lbs CO₂/gallon
CO₂ Avoided = Gas CO₂ − EV CO₂

Assumptions & References

  • Massachusetts electricity rate: ~23.4 ¢/kWh (2024 residential average). Source: U.S. EIA — Massachusetts Electricity Profile.
  • Charger efficiency: Level 2 (240V) chargers typically operate at 90–95% efficiency; Level 1 (120V) at 85–90%. Source: U.S. DOE — Charging at Home.
  • Massachusetts grid CO₂ intensity: ~0.28 lbs CO₂/kWh (2023 ISO-NE average). Source: ISO New England 2023 Emissions Report.
  • Gasoline CO₂: 19.6 lbs CO₂ per gallon of gasoline burned. Source: U.S. EIA — CO₂ Emissions Coefficients.
  • Gasoline price comparison: Assumes ~$3.20/gallon (Massachusetts average, 2024) and 28 MPG for a typical ICE vehicle. Source: AAA Gas Prices — Massachusetts.
  • Weeks per month: 4.345 (365.25 days / 12 months / 7 days).
  • This calculator estimates home charging costs only. Public DC fast charging rates vary significantly by network and location.
  • Actual costs may vary based on time-of-use (TOU) rates, utility provider, seasonal rate changes, and driving conditions.
  • Massachusetts utilities (Eversource, National Grid, Unitil) offer EV-specific TOU rates that may reduce overnight charging costs significantly.

More Calculators

In the network

Network