EV Charging Calculator

Estimate EV Charging Time, Units (kWh) & Total Costs in Seconds

Calculate charging duration, required units, and cost for any electric vehicle in India. Compatible with 70+ EV models and all charger types from home wallboxes to 350 kW ultra-fast DC chargers.

₹1.00 – ₹1.40 / km

Average home running cost — up to 80% cheaper than petrol/diesel.

₹6 – ₹9 / unit

Standard domestic electricity rate across most Indian states.

30 – 45 Mins

Typical DC fast charge top-up (20% to 80%) on highway corridors.

20% – 80% Rule

Optimizes charging speed and preserves long-term battery health.

Interactive Tool

EV Charging Speed & Cost Calculator

Estimate your exact charging duration, electricity consumption, and cost based on battery capacity, charger output, and electricity tariff.

Input Vehicle & Charger Details

Select EV Preset

Battery Capacity (kWh)

Start Charge: 20%

Target Charge: 80%

Charger Output (kW)

Electricity Tariff Rate (₹ / kWh) Home ~₹7-8 | Commercial Fast ~₹18-22

Estimated Charging Time

2h 8m

(Includes thermal loss & fast charging taper curve)

14.4 kWh

₹ 285.12

Indian EV Battery Capacity Directory

Click on any EV model below to instantly load its battery capacity into the calculator.

EV Brand & Model	Battery Capacity (kWh)

Showing 0 models

How EV Charging Cost is Calculated

The exact cost of charging an electric vehicle depends on the battery energy required (kWh) and your electricity provider's tariff per unit.

Formula:
Energy Required (kWh) = Battery Capacity × (Target % - Start %)
Charging Cost (₹) = Energy Required × Tariff (₹/kWh) × Efficiency Factor (1.1)

Efficiency Factor: Approximately 10% of electrical energy is naturally dissipated during transmission and AC-to-DC rectification as thermal loss. Our calculator automatically factors this in for accurate real-world bills.

How Charging Time is Calculated

Charging duration is governed by the bottleneck between the charger's peak output (kW) and the vehicle's maximum allowable acceptance rate.

Formula:
Charging Time (Hours) = Energy Added (kWh) ÷ (Charger Output kW × Efficiency)

DC Tapering Curve: DC fast chargers slow down power delivery after 80% State of Charge (SoC) to safeguard lithium-ion cells against overheating and dendrite formation. The calculator accounts for this reduced taper speed from 80% to 100%.

Cost Comparison: Electric vs Petrol vs Diesel

See how much you save on daily commuting and long highway road trips with electric vehicles.

Vehicle Fuel Type	Cost per Unit / Litre	Efficiency	Running Cost / km	500 km Road Trip	Annual Savings (15,000 km)
EV Home Charging	₹7.50 / kWh	7.5 km / kWh	₹1.00 / km	₹500	Baseline (~₹1,05,000 Saved)
EV Public Fast Charging	₹20.00 / kWh	7.0 km / kWh	₹2.85 / km	₹1,425	₹77,250 Saved
Petrol Car (Compact SUV)	₹102.00 / Litre	14 km / L	₹7.28 / km	₹3,640	₹0 (Highest expense)
Diesel Car	₹90.00 / Litre	17 km / L	₹5.29 / km	₹2,645	₹29,850 Saved vs Petrol

Frequently Asked Questions

What is a unit of EV charging electricity in India?

1 electricity unit equals 1 kilowatt-hour (kWh). If your electric vehicle has a 30 kWh battery and charges from 0% to 100%, it consumes approximately 33 units (including transmission losses).

Why does charging slow down after 80% on DC fast chargers?

Lithium-ion batteries accept rapid current easily when discharged. Beyond 80%, internal resistance and temperature increase, so the battery management system (BMS) tapers charging current to preserve battery health.

Can I charge my EV using a standard 15A home socket?

Yes, most EVs include an emergency slow charger (3.3 kW) that connects to a dedicated, properly earthed 15A/16A wall socket. Full charge takes between 10 to 18 hours depending on battery size.

How can I reduce my EV charging costs at home?

Apply for a dedicated EV meter with subsidized Time-of-Day (ToD) tariffs from your local DISCOM, charge during overnight off-peak hours (11 PM - 6 AM), or connect your home wallbox to rooftop solar panels.

Ready to find a charging station?

Locate 5,000+ EV chargers across India with real-time status and route planning.

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