SpecCalc Hub · Estimate
EV Home Charging Cost Calculator
Estimate EV charging energy, cost, and time from battery size, SOC, efficiency, tariff, and charger power.
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No account required. Calculation history is not stored.
Formula
battery_energy_added_kwh = capacity * (target_soc - start_soc) grid_energy_kwh = battery_energy_added_kwh / efficiency charging_cost = grid_energy_kwh * tariff charging_time_hours = grid_energy_kwh / charger_power_kw
Assumptions
- Inputs are user-provided.
- Results are preliminary estimates.
- Charger power and tariff are constant.
Limitations
- Real charging can slow near high SOC and may include losses not modeled here.
Sources / methodology
Converts SOC difference into battery energy and adjusts for charging efficiency.
- Formula version
- 1.0.6
- Formula review date
- 2026-05-25
Source links
Quick answer: EV Home Charging Cost Calculator estimates energy added to battery from transparent input parameters and a visible formula. Results are informational estimates only and should be checked against the stated assumptions and limitations.
Input parameters
- Battery capacity (kWh): 60 kWh
- Start SOC (%): 20 %
- Target SOC (%): 80 %
- Charging efficiency (%): 90 %
- Tariff per kWh (/kWh): 0.15 USD/kWh
- Charger power (kW): 7.2 kW
- Currency: USD
Output values
- Energy added to battery (kWh)
- Grid energy (kWh)
- Charging cost
- Charging time (h)
Step-by-step example
Calculation for the example inputs shown above:
- E = 60 × (80 − 20)/100 = 36 kWh
- E₀ = 36 ÷ (90/100) = 40 kWh
- Cost = 40 × USD 0.15/kWh = USD 6.00
- t = 40 ÷ 7.2 = 5.56 h
Charging power is assumed constant at the grid input. Real charging can slow at high state of charge.
Worked examples
Worked example with the form defaults
Example inputs: Battery capacity: 60 kWh; Start SOC: 20 %; Target SOC: 80 %; Charging efficiency: 90 %; Tariff per kWh: 0.15 USD/kWh; Charger power: 7.2 kW; Currency: USD. E = 60 × (80 − 20)/100 = 36 kWh. E₀ = 36 ÷ (90/100) = 40 kWh. Cost = 40 × USD 0.15/kWh = USD 6.00. t = 40 ÷ 7.2 = 5.56 h. Charging power is assumed constant at the grid input. Real charging can slow at high state of charge.
Alternative calculation scenario
Example inputs: Battery capacity: 60 kWh; Start SOC: 20 %; Target SOC: 90 %; Charging efficiency: 90 %; Tariff per kWh: 0.15 USD/kWh; Charger power: 7.2 kW; Currency: USD. E = 60 × (90 − 20)/100 = 42 kWh. E₀ = 42 ÷ (90/100) = 46.67 kWh. Cost = 46.666667 × USD 0.15/kWh = USD 7.00. t = 46.666667 ÷ 7.2 = 6.48 h. Charging power is assumed constant at the grid input. Real charging can slow at high state of charge.
What the result does not establish
Charging power is the grid-side input used by this model. Constant-power time is an estimate: vehicle AC limits, battery temperature, tapering and charging-station fees may change the result.
Common mistakes
- Keep all units consistent with the field labels.
- Check whether the input values are measured, nameplate values or planning assumptions.
- Review the stated assumptions and limitations before using the estimate.
What to check next
Check the inputs, limitations, sources and related calculators before using the estimate in a real decision.
FAQ
What does EV Home Charging Cost Calculator calculate?
EV Home Charging Cost Calculator estimates energy added to battery from transparent input parameters and a visible formula. Results are informational estimates only and should be checked against the stated assumptions and limitations.
What formula does this calculator use?
The visible formula starts with: battery_energy_added_kwh = capacity * (target_soc - start_soc). The full formula, assumptions and limitations are shown on the page.
Are the results stored?
No account is required and SpecCalc Hub does not save personal calculation history.
Related calculators
This calculator provides an estimate for informational purposes only. It is not a certified engineering design, electrical safety approval, or professional installation recommendation. Always verify final decisions with a qualified professional and applicable local codes.