How much does it cost to charge an EV at home?

At average European electricity rates (€0.25/kWh), charging a 75 kWh battery costs about €18.75. This provides 400-500 km of range, making the cost per 100 km around €4-5—about 65% cheaper than petrol.

Is it cheaper to charge at home or at a public station?

Home charging is almost always cheaper. Home rates are typically €0.15-0.30/kWh, while public Level 2 chargers cost €0.30-0.50/kWh and DC fast chargers can cost €0.50-0.80/kWh.

Why should I not charge to 100%?

Regularly charging to 100% can accelerate battery degradation. Most manufacturers recommend daily charging to 80% and only charging to 100% before long trips. Modern EVs have built-in battery management to mitigate this.

How much range do I get per kWh?

Most EVs get 5-7 km per kWh (3-4 miles per kWh). Efficient EVs like Tesla Model 3 or Hyundai Ioniq 6 can achieve 7+ km/kWh, while larger SUVs may only get 4-5 km/kWh.

🌱Energy & Environment

How to Calculate EV Charging Time and Cost

Understanding EV charging is essential for electric vehicle owners. This comprehensive guide explains how to calculate charging time, estimate costs, and compare different charging levels to optimize your EV experience.

4 min read

December 29, 2025

Updated: Jan 10, 2026

Electric vehicle plugged into charging station with digital display

Understanding EV Charging Levels

Electric vehicles can be charged at three different levels, each with dramatically different speeds. Level 1 uses a standard household outlet (120V), Level 2 uses a dedicated 240V circuit, and Level 3 (DC Fast Charging) uses high-powered commercial stations.

How to Calculate EV Charging Time

The basic formula for calculating charging time is straightforward: divide your battery capacity by the charger power.

Charging Time Formula

Charging Time (hours) = Battery Capacity (kWh) ÷ Charger Power (kW) For 10-80% charge: Time = (Battery kWh × 0.7) ÷ Charger kW Example: 75 kWh battery on 11 kW charger (75 × 0.7) ÷ 11 = 4.8 hours

EV Charging Speed Calculator

Use our calculator to estimate how much range you gain per hour of charging:

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Use our free Miles to Kilometers converter for instant, accurate results.

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Charging Level Comparison Table

This table shows the dramatic difference between charging levels:

Charging Level	Power (kW)	Range Added/Hour	Full Charge Time*	Best For
Level 1 (120V)	1.4	5-8 km	40-60 hours	Emergency only
Level 2 (240V)	7-22	40-130 km	4-10 hours	Home/workplace
DC Fast (50kW)	50	250-300 km	1-1.5 hours	Road trips
DC Ultra-Fast	150-350	400-600 km	20-40 min	Highway stops

How to Calculate EV Charging Cost

Calculating your charging cost is simple once you know your electricity rate and vehicle efficiency.

Cost Calculation

Cost per 100 km = (kWh/100km) × Price per kWh Example: 17 kWh/100km × €0.25/kWh = €4.25 per 100 km Compare to petrol: 7 L/100km × €1.80/L = €12.60 per 100 km EV savings: 66%!

Electric vehicle charging at modern home garage with glowing indicator

Home Charging vs Public Charging Costs

Where you charge significantly impacts your costs:

Charging Location	Typical Price	Cost per 100 km*	Notes
Home (off-peak)	€0.10-0.15/kWh	€1.70-2.55	Cheapest option
Home (standard)	€0.20-0.35/kWh	€3.40-5.95	Still economical
Workplace	€0.00-0.25/kWh	€0-4.25	Often free
Public Level 2	€0.30-0.50/kWh	€5.10-8.50	Convenient
DC Fast Charging	€0.40-0.80/kWh	€6.80-13.60	Premium for speed

Understanding Charging Efficiency Loss

Not all electricity from the grid ends up in your battery. Typical charging efficiency is 85-95%, meaning a 75 kWh battery actually requires 80-88 kWh from the grid to fully charge.

Efficiency Factors

Charging losses occur from: • Charger conversion: 2-5% • Battery thermal management: 3-8% • Onboard charger: 2-5% DC fast charging can have higher losses (10-20%) due to heat generated at high power levels.

Tips to Optimize Your EV Charging

Smart charging habits can save you money and extend battery life:

1. **Charge during off-peak hours** - Electricity rates can be 50% lower at night 2. **Keep battery between 20-80%** - Daily charging to 100% degrades battery faster 3. **Precondition while plugged in** - Heat or cool your car before unplugging to save range 4. **Use scheduled charging** - Most EVs let you set departure time for optimal charging 5. **Consider a home solar system** - Free daytime charging with solar panels

How to Calculate EV Range from Battery Size

Battery size directly correlates to range, but efficiency varies by vehicle. A typical EV uses 15-20 kWh per 100 km. To estimate range, divide the battery capacity by consumption: Range (km) = Battery (kWh) ÷ Consumption (kWh/100km) × 100. For a 75 kWh battery at 17 kWh/100km: 75 ÷ 17 × 100 ≈ 441 km range.

Factors That Affect Real-World Range

EPA and WLTP range ratings are tested under ideal conditions. Real-world range is affected by:

Range Reduction Factors

• Cold weather (-15°C): -20 to -40% • Highway speeds (130 km/h): -20 to -30% • Air conditioning: -10 to -15% • Heating: -15 to -25% • Aggressive driving: -15 to -25% • Mountainous terrain: -10 to -20%

❓Frequently Asked Questions

Charging time varies dramatically by charger type. Level 1 (home outlet) takes 40-60 hours for a full charge, Level 2 (home charger) takes 4-10 hours, and DC fast charging can add 80% charge in 20-40 minutes.

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