EV Charging Time Calculator
Enter your battery size, current charge level and charger power to calculate exactly how long charging will take — from a standard home wallbox to a 350 kW ultra-fast DC charger.
Last updated: May 2026
77 kWh battery from 20% to 80% on a 7.4 kW charger takes about 7 h 6 min, adding 46.2 kWh.
Home wallbox — typical overnight schedule
Common EV charger types
| Charger type | Power | 77 kWh (20→80%) | Notes |
|---|---|---|---|
| Household outlet | 2.3 kW | ~18 h | Standard 3-pin plug, emergency use only |
| Slow home charger | 3.7 kW | ~11 h | Dedicated cable, overnight-only charging |
| Home wallbox (standard) | 7.4 kW | ~5.5 h | Single-phase 32 A, most common home install |
| 3-phase home/work | 11 kW | ~3.7 h | Three-phase connection required |
| Public AC fast | 22 kW | ~1.9 h | Speed limited by car's onboard charger |
| DC fast charger | 50 kW | ~55 min | Standard DC rapid (motorway services) |
| DC high-power | 100–150 kW | ~25–35 min | Tesla Supercharger v2, modern DC stations |
| DC ultra-fast | 250–350 kW | ~10–15 min | Ionity, Tesla Supercharger v3+ |
Frequently asked questions
Why is my actual charging time longer than calculated?
Several factors slow real-world charging. Battery management systems taper charging speed above 80% SoC to protect cells — a 100 kW DC charger might deliver full power from 20–70%, then drop to 40 kW by 85% and 15 kW near 95%. Your car's onboard AC charger also caps AC charging regardless of station rating: a car with a 7.4 kW onboard charger can't use more than 7.4 kW from an 11 kW station. Cold batteries also charge significantly slower until warmed up.
What is the difference between AC charging and DC fast charging?
AC charging uses the car's onboard charger to convert mains current into DC for the battery — the conversion happens inside the car, limiting speed to 7.4 kW (single-phase) or 11–22 kW (three-phase). DC fast charging bypasses the onboard charger entirely and delivers high-voltage DC directly to the battery pack, allowing speeds of 50–350 kW. DC chargers cost significantly more to install and operate, so public DC charging typically costs 2–3× more per kWh than home AC charging.
Should I always charge to 100%?
For daily use, most EV manufacturers recommend stopping at 80% to extend battery longevity. Lithium-ion cells degrade faster when held at high state-of-charge for extended periods. Most EVs let you set a charge limit in the app or settings. For long trips where you need maximum range, charging to 100% is fine — just plan to drive soon after rather than leaving the car parked at full charge overnight.
Why does DC charging slow down above 80%?
This is called "charge tapering." Above 80% SoC, the battery management system reduces current to prevent cell stress and overcharge damage. A 150 kW charger might run at full power from 20–70%, taper to 80 kW at 75%, and drop to 15 kW near 95%. That's why the last 20% (80–100%) can take nearly as long as the first 60% (20–80%). Planning charging stops around the 20–80% window maximises both charging speed and long-term battery health.
How does cold weather affect charging time?
Below 5°C, battery management systems limit charging speed by 30–60% to prevent lithium plating and cell damage. Some EVs have battery pre-conditioning — heating the pack before arriving at a charger — which significantly reduces cold-weather charging time. Without pre-conditioning, expect 30–50% longer charging sessions at -10°C compared to 20°C, especially at DC fast chargers where protection systems are most aggressive.