🔋 EV Charging Cost Calculator

Enter your EV's battery capacity, efficiency (kWh/100km), and electricity rate to calculate the cost of a full charge and the cost per 100km. Compare against an equivalent gasoline car to see how much you save.

Select Vehicle (battery capacity reference)

Battery Capacity (kWh)

EV Efficiency (kWh/100km)

Real-world efficiency varies significantly by vehicle, season, and driving style (highway vs. city). The default of 18 is a rough reference for a mid-size SUV combined figure.

Select Electricity Rate

Electricity Rate (KRW/kWh)

Charging incurs roughly 10% power loss, so the grid/meter draws more electricity than actually reaches the battery.

Gasoline Price (KRW/L)

Gasoline Car Efficiency (km/L)

Full Charge Cost

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Grid Energy Needed (incl. 10% charging loss) — EV Cost per 100km — Equivalent Gasoline Car Cost per 100km — Savings per 100km — Savings % — Estimated Monthly Savings (at 1,000km/month) —

Rates shown are 2026-07 reference figures (Korea Ministry of Environment public charging tariff). Actual charging cost varies significantly by charging network operator, membership plan, and time of use. Always check your charging provider's current published rate.

GUIDE

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How EV Charging Cost Is Calculated

Full-charge cost = battery capacity (kWh) ÷ 0.9 (charging efficiency) × electricity rate (KRW/kWh). The 0.9 factor accounts for roughly 10% power loss during charging, meaning the meter draws more electricity than actually ends up in the battery. Cost per 100km uses the same formula with efficiency (kWh/100km) in place of battery capacity.

Slow, Fast, and Off-Peak Rate Differences

As of the August 2026 tariff revision, public slow AC charging (under 30kW) is about 294.3 KRW/kWh, while DC fast charging (100-200kW) is about 347.2 KRW/kWh. Charging at home during off-peak night hours (23:00-09:00, KEPCO off-peak rate) can cost as little as 60-75 KRW/kWh — a 4-5x difference depending on where and when you charge.

Why the ~10% Charging Efficiency Loss Matters

When charging an EV, some power is lost as heat between the outlet/charger and the battery. Because your bill is based on electricity that passes through the meter — not what actually reaches the battery — accurately estimating cost requires accounting for this loss.

Gasoline Comparison Methodology and Limits

The equivalent gasoline cost per 100km is calculated as (100 ÷ fuel efficiency in km/L) × gasoline price (KRW/L). This is a simple fuel-cost-only comparison; it does not account for real-world efficiency variation, seasonal changes, or non-fuel maintenance costs like oil changes.

Real-World EV Efficiency Varies

EV efficiency (kWh/100km) can change substantially with season (winter heating can increase consumption 30-40%), temperature, driving style, and the mix of highway vs. city driving. The default of 18 kWh/100km is a rough reference for a mid-size SUV; adjust it to your vehicle's actual average for a more accurate estimate.

Rate Disclaimer (Please Read)

The electricity rates shown are 2026-07 reference figures based on Korea's Ministry of Environment public charging tariff revision. Actual charging cost varies significantly by charging network operator, membership plan, and time of use. Always check your charging provider's current published rate before relying on these figures.

Battery Capacity Reference Table

Vehicle	Battery Capacity (kWh)
Hyundai Ioniq 5 (Long Range)	84.0
Hyundai Ioniq 5 (Standard 2WD)	63.0
Kia EV6 (Long Range)	84.0
Tesla Model 3 (Premium RWD)	77.8
Tesla Model Y (Long Range AWD)	82.0
Hyundai Kona Electric (Long Range)	64.8
Kia Niro EV	64.8
Hyundai Ioniq 6 (Long Range)	84.0
KG Mobility Torres EVX (Base)	73.4
BMW i4 (eDrive40)	84.0

Frequently asked questions

Why does charging efficiency (10% loss) matter?

Your electricity bill is based on power drawn through the meter, not the power that actually reaches the battery. About 10% is lost during charging, so ignoring this underestimates the real cost.

How accurate is the gasoline comparison?

It's a rough fuel-cost-only estimate. Actual gasoline car efficiency varies by model and driving conditions, and non-fuel costs like maintenance are not included.

Why do rates vary by charging operator?

The slow/fast presets here reflect Korea's government-published public charging tariff. Private charging network operators set their own prices independently, so your actual rate depends on the station and membership plan you use.

What if my EV isn't in the preset list?

Select "Custom / Other" in the vehicle dropdown and enter your battery capacity (kWh) directly. You can find this figure in the manufacturer's official specs or owner's manual.