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+ |
How charge time slots into the rest of your EV planning
Duration is the second number you need, and it sits between the question your home installation answers and the cost question that follows it. Before you can use this calculator meaningfully, the home charger planner tells you what power your consumer unit actually allows, because that power figure is your input here. You are here: step 2, how long a charge takes. With the session duration in hand, you move to the charging cost calculator (step 3) to price the energy you just timed, then on to the range and cost calculator (step 4) to turn that cost into a per-kilometre figure you can compare against petrol directly. Step 5, the EV vs petrol calculator, shows what a year of that difference actually saves, and step 6, the trip planner, tells you whether a specific journey fits on one charge or needs a stop. If your roof is involved, the solar panels for EV charging calculator sizes the array against your daily kilometres and can push your effective charging rate close to zero. One thing duration reveals that cost alone does not: on a long motorway run the last 20% of a DC session is the slowest part by far, so stopping at 80%, driving on, and picking up the remaining range at the next station is nearly always faster than waiting for a full charge.
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.
When should I set the target to 80% versus 100%, and how much extra time does it add?
For overnight home charging, 80% is enough for most daily distances and the cells stay healthier held below full. The time difference matters most at a DC fast charger: from 20% to 80% might take 25 minutes on a 150 kW station, while the final 80% to 100% segment can add another 30 to 40 minutes because the taper cuts power dramatically. On a road trip that makes 80% the practical stop point. Set the target to 100% only when you genuinely need the full range and plan to drive immediately after, rather than leaving the car parked at full charge for hours.
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.