How is EV charging time calculated?

Charging time depends on the energy you need to add (battery size × the change in state of charge), the effective power delivered (the lower of the charger's rating and what your vehicle accepts) and charging losses. For DC fast charging the calculator also models the natural slowdown in power above 80% SOC.

Why does DC charging slow down after 80%?

To protect the battery, an EV's management system tapers the charging current as the pack fills. Charging from 20–80% is fast, while the last 20% takes disproportionately longer — which is why this calculator models a realistic taper instead of a flat rate.

SOC stands for State of Charge — how full the battery is, as a percentage. Set your current SOC and target SOC and the calculator estimates the time and range for that top-up.

Which Chargisthan charger should I choose?

2-wheelers and 3-wheelers charge best on our AC chargers (3.3–22 kW). Cars can use AC for home and workplace charging or DC fast chargers (20–120 kW) for rapid top-ups. The calculator highlights the best-matched model for your vehicle.

EV Charging Time Calculator

Choose your vehicle type

Select your model

battery auto-fills

Set your battery level (SOC)

State of Charge

Current charge0%

Charge up to (target)100%

Pick a charger

filter AC / DC

Estimated Result

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Choose a vehicle type, model and charger to see your charging time and range.

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estimated charging time

100%target

Range Added

— km

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Charge power

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Energy added

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Charge speed

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Approx cost

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SOC over time—

Electricity tariff ₹ / kWh

Get a quote for this charger

How this estimate works

Effective power is the lower of the charger's rating and what your vehicle can accept — a 120 kW DC charger won't charge a car that maxes out at 50 kW any faster.
DC fast charging tapers above ~80% SOC to protect the battery, so 20–80% is quick while the last 20% takes longer. The curve above models this.
Charging losses (~10% AC, ~5% DC) and typical real-world efficiency (km/kWh) are included.
Range is based on each model's real-world efficiency, not lab (ARAI) figures.

Estimates only. Actual time and range vary with temperature, battery age, charging curve, cable and grid conditions. Battery and efficiency figures are approximate market values.

How the calculator works

A transparent, physics-based estimate — not a flat "battery ÷ charger" guess. Here's exactly what goes into every number.

160+EV models

—2-wheelers

—3-wheelers

—4-wheelers

10Chargisthan chargers

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1 · Effective power

Charging speed is capped by whichever is lower — the charger's output or the vehicle's on-board limit. A scooter that accepts 1 kW won't charge faster on a 22 kW unit; a 50 kW car won't gain from a 120 kW DC charger.

The tool flags when your vehicle is the bottleneck.

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2 · Energy needed

We use your battery size and the gap between current SOC and target SOC to find the exact kWh to add: energy = battery × (target − start) ÷ 100.

Range added then comes from each model's real-world efficiency (km/kWh), not optimistic ARAI lab figures.

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3 · DC taper & losses

DC fast charging slows down above ~80% SOC to protect the battery, so we integrate the charge in 1% steps with a realistic power taper instead of assuming a flat rate.

Charging losses (~10% AC, ~5% DC) are built in, and the curve shows SOC over time.

The maths, in full

Effective power = min( charger kW , vehicle max AC/DC kW ) The vehicle's on-board charger or DC limit often caps the real speed.

Energy to add = battery kWh × ( target% − start% ) ÷ 100 How many kWh must flow into the pack for your chosen top-up.

Charging time = Σ ( 1% energy ÷ ( effective power × loss × taper ) ) Summed 1% at a time so the DC slow-down above 80% is captured. AC has no taper. Loss ≈ 0.90 (AC) / 0.95 (DC).

Range added = energy added × efficiency (km/kWh) Charge speed shown as "km per hour of charging" = range added ÷ time.

DC power taper by battery level

State of Charge	Battery behaviour	Power delivered
0 – 60%	Bulk phase — accepts full power	100%
60 – 80%	Ramping down slightly	~85%
80 – 90%	Taper begins to protect cells	~60%
90 – 95%	Significantly reduced	~42%
95 – 100%	Trickle / balancing	~28%

This is why public charging is usually done to 80% — the last 20% can take as long as the first 60%. AC charging stays roughly constant throughout.

Which charger for which vehicle?

2-WheelerOn-board charger limits to ~0.5–1.3 kW. Our 3.3 kW smart socket is ideal; they charge on AC only.

3-WheelerAccept ~1–3.3 kW AC; a few cargo models take 12–15 kW DC. AC 3.3–7 kW suits most e-autos.

4-WheelerAC 7–22 kW for home/work; DC 20–40 kW or 60–120 kW for rapid top-ups.

Quick glossary

SOC (State of Charge): How full the battery is, in %. Start = now, target = where you want to reach.
kWh vs kW: kWh is battery size (energy); kW is charger speed (power).
On-board charger: The AC converter inside the EV — it sets the vehicle's AC charging ceiling.
Efficiency (km/kWh): Distance per unit of energy — higher means more range from the same charge.