Tesla Charging Cost Calculator
Estimate the cost of charging a Tesla at home versus a Supercharger.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
Enter the electricity rates and vehicle efficiency for your scenario. The model uses illustrative charging-efficiency assumptions of 90% at home and 93% at a Supercharger; actual rates and losses vary. Taxes, idle fees and other charges are excluded. Annual cost difference is positive when home charging is cheaper; range uses your entered miles per kWh.
Worked example
calculated with the default values below
Usable battery capacity 75 kWh · Starting charge 15 % · Target charge 90 % · Home electricity rate (USD/kWh) 0.16 USD/kWh · Supercharger rate (USD/kWh) 0.42 USD/kWh · Vehicle efficiency 3.2 mi/kWh · Charges per month 8 Home charging cost per charge 10.00 USD · Supercharger cost per charge 25.40 USD · Energy added per charge 56.25 kWh · Annual modeled cost difference (positive = home savings) 1,479 USD · Range added per charge 180 mi
General background references
Disclaimer
These calculators give estimates for general information only. Real fuel consumption, performance and range vary with driving style, load, terrain, temperature and vehicle condition. Do not rely on these results for towing limits, payload or braking decisions — use the rating plate of your vehicle.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
E = B(t − s) ÷ 100; C = E ÷ η × r
- B
- Battery capacity (kWh)
- t
- Target charge (%)
- s
- Start charge (%)
- η
- Illustrative efficiency: 0.90 home, 0.93 Supercharger
- r
- Electricity rate (currency/kWh)
- E
- Energy added (kWh)
Annual cost difference = (Supercharger cost − home cost) × charges/month × 12; positive means modeled home savings. The efficiency factors are illustrative, not universal measurements.
Frequently asked questions
How does the calculator estimate charging cost?
It calculates energy added from battery capacity and the change in charge level, then applies your entered electricity rates. It assumes illustrative charging efficiencies of 90% at home and 93% at a Supercharger; those values are not universal measurements. Taxes, idle fees and other charges are excluded.
What does a positive annual cost difference mean?
It means the modeled Supercharger cost is higher than the modeled home cost for your inputs, multiplied by charges per month and 12. A negative result means home charging costs more in this scenario. Range added uses the vehicle efficiency you entered.