{
    "name": "EV Charging Time Calculator",
    "url": "https://calculators.geekmidst.com/calculators/ev-charging-duration-calculator",
    "markdown": "https://calculators.geekmidst.com/calculators/ev-charging-duration-calculator.md",
    "category": "Energy & environment",
    "description": "Estimate how long an electric car takes to charge from its battery size, start and target charge, charger power, the car’s own limit and charging losses.",
    "summary": "Charging time is the energy the battery needs divided by the power actually reaching it: the lower of the charger and car limits, less charging losses.",
    "also_called": [
        "EV charge time calculator",
        "Electric car charging time calculator"
    ],
    "applies_to": "Worldwide",
    "last_updated": "2026-10-29",
    "computation": "Results are computed in the visitor’s browser on the HTML page. This API describes the calculator; it does not compute results.",
    "inputs": [
        {
            "name": "capacity",
            "label": "Usable battery capacity",
            "type": "number",
            "default": "60",
            "unit": "kWh"
        },
        {
            "name": "start_soc",
            "label": "Starting charge",
            "type": "number",
            "default": "20",
            "unit": "%"
        },
        {
            "name": "target_soc",
            "label": "Target charge",
            "type": "number",
            "default": "80",
            "unit": "%"
        },
        {
            "name": "charger_kw",
            "label": "Charger power",
            "type": "number",
            "default": "7.2",
            "unit": "kW"
        },
        {
            "name": "car_limit_kw",
            "label": "Car’s maximum charging rate",
            "type": "number",
            "default": "",
            "unit": "kW",
            "optional": true
        },
        {
            "name": "efficiency",
            "label": "Charging efficiency",
            "type": "number",
            "default": "90",
            "unit": "%"
        }
    ],
    "outputs": [
        {
            "key": "time_text",
            "label": "Charging time",
            "format": "text"
        },
        {
            "key": "hours",
            "label": "Charging time in hours",
            "format": "number"
        },
        {
            "key": "energy_added",
            "label": "Energy added to the battery",
            "format": "number"
        },
        {
            "key": "grid_kwh",
            "label": "Energy drawn from the grid",
            "format": "number"
        },
        {
            "key": "effective_kw",
            "label": "Power reaching the battery",
            "format": "number"
        }
    ],
    "formula": {
        "text": "Energy = Capacity × (Target% − Start%);  Power = min(Charger kW, Car limit kW) × Efficiency;  Time = Energy ÷ Power",
        "variables": {
            "Capacity": "usable battery capacity, kWh",
            "Efficiency": "share of grid energy stored in the battery"
        }
    },
    "worked_example": {
        "inputs": {
            "capacity": "60",
            "start_soc": "20",
            "target_soc": "80",
            "charger_kw": "7.2",
            "car_limit_kw": "",
            "efficiency": "90"
        },
        "steps": [
            "Energy = 60 × (80% − 20%) = 36 kWh.",
            "Power into the battery = 7.2 × 0.90 = 6.48 kW.",
            "Time = 36 ÷ 6.48 = 5.56 h ≈ 5 h 33 min; grid energy = 36 ÷ 0.9 = 40 kWh."
        ],
        "result": "Charging a 60 kWh battery from 20% to 80% on a 7.2 kW charger takes about 5 hours 33 minutes."
    },
    "interpretation": "On AC home charging the estimate is usually close, because power stays near constant. At DC rapid chargers, power tapers as the battery fills, so the time above about 80% is longer than this constant-power estimate.",
    "assumptions": [
        "Charging power is constant for the whole session.",
        "The capacity entered is usable, not gross, capacity."
    ],
    "limitations": [
        "Does not model DC taper curves, battery temperature or preconditioning."
    ],
    "rules": null,
    "faqs": [
        {
            "question": "Why does a 22 kW charger only give my car 11 kW?",
            "answer": "On AC, the car’s onboard charger sets the limit. Enter that limit in the car field."
        },
        {
            "question": "Why charge to 80% rather than 100%?",
            "answer": "Charging slows near full, and many makers recommend a lower everyday limit to reduce battery wear. Check your car’s manual."
        }
    ],
    "sources": [],
    "related": [
        {
            "name": "EV Charging Cost Calculator",
            "url": "https://calculators.geekmidst.com/calculators/ev-charging-cost-calculator"
        },
        {
            "name": "EV Battery Range Calculator",
            "url": "https://calculators.geekmidst.com/calculators/ev-battery-range-calculator"
        },
        {
            "name": "Battery State of Charge Calculator",
            "url": "https://calculators.geekmidst.com/calculators/battery-state-of-charge-calculator"
        }
    ],
    "disclaimer": null,
    "publisher": "GM¹X CalcVerse"
}