EV Charging Time Calculator
Calculate how long it takes to charge your electric vehicle from any level using home, public, or rapid chargers. Includes charging cost estimates.
Charging time is one of the first questions people ask about switching to an electric vehicle — and one of the most misunderstood. The answer depends on three things: your car's battery size, the charger you're using, and how much charge you're starting from.
This calculator handles all three. Enter your EV's battery capacity (kWh), your current state of charge (%), and the charger type, and you'll get the time to reach your target charge plus the cost.
How Long Does It Take to Charge an Electric Car?
| Charger Type | Power | Miles added per hour | Full charge (75kWh battery) |
|---|---|---|---|
| 3-pin household socket | 2.3kW | 8 miles / 13 km | 33 hours |
| 7kW home wallbox | 7kW | 25 miles / 40 km | 11 hours |
| 22kW workplace/public | 22kW | 76 miles / 122 km | 3.5 hours |
| 50kW DC rapid | 50kW | 100 miles / 160 km | ~1.5 hours (to 80%) |
| 150kW DC ultra-rapid | 150kW | 300 miles / 483 km | ~30 min (to 80%) |
| 350kW DC ultra-rapid | 350kW | 700 miles / 1,127 km | ~15 min (to 80%) |
Why stop at 80%? Most EVs slow down charging significantly above 80% to protect battery longevity. For daily driving, stopping at 80–90% is the standard recommendation from most manufacturers.
The Formula
Charging time (hours) = (Battery capacity kWh × % to add) ÷ Charger power (kW)
Example — charging a Tesla Model 3 (75kWh) from 20% to 80% on a 7kW home wallbox:
Energy needed = 75 kWh × (80% − 20%) = 75 × 0.60 = 45 kWh
Charging time = 45 kWh ÷ 7kW = 6.4 hours
You'd plug in before bed and wake up to a full usable charge.
Example — same car at a 150kW rapid charger:
Charging time = 45 kWh ÷ 150kW = 0.3 hours = 18 minutes
That's a motorway stop with a coffee.
Real-World Charging Speed vs Rated Speed
In practice, charging is rarely exactly as fast as the charger's headline rating — for two reasons:
1. Your car's on-board charger limits AC charging speed. Even a 22kW public charger can only charge as fast as your car can accept. Most EVs have a 7kW or 11kW on-board AC charger. A Tesla Model 3 Long Range accepts up to 11kW AC. A Nissan Leaf accepts 6.6kW AC. Plugging into a 22kW charger doesn't make it faster.
2. DC rapid chargers taper from about 80% SoC. As the battery fills, the car reduces incoming power to protect the cells. The "150kW" rating is the peak — actual average across a session might be 90–110kW.
Real-world vs rated table (selected popular EVs, 10%→80%):
| EV Model | Battery (usable) | 7kW wallbox | 50kW rapid | 150kW rapid |
|---|---|---|---|---|
| Tesla Model 3 SR | 57.5 kWh | 8.2 hrs | 2.5 hrs | ~42 min |
| Tesla Model 3 LR | 75 kWh | 9.5 hrs | 2.3 hrs | ~28 min |
| Volkswagen ID.4 | 77 kWh | 11 hrs | 3.2 hrs | ~38 min |
| BMW iX3 | 74 kWh | 10.6 hrs | 3.0 hrs | n/a (max 11kW AC) |
| Nissan Leaf (40kWh) | 39 kWh | 6.1 hrs | 55 min | n/a |
| Ford Mustang Mach-E | 68 kWh | 9.7 hrs | 2.7 hrs | ~38 min |
| Hyundai IONIQ 6 | 77.4 kWh | 11 hrs | 2.6 hrs | ~22 min |
Charging Cost Calculator
Charging at home is significantly cheaper than public rapid charging.
At home (7kW wallbox):
- UK rate (24p/kWh): £0.24 × 45 kWh = £10.80 for a 45kWh charge
- US rate (16¢/kWh): $0.16 × 45 kWh = $7.20 for a 45kWh charge
At a public rapid charger (150kW):
- UK typical rate (69p–80p/kWh at bp pulse, Pod Point): £31–£36 for 45 kWh
- US typical rate (40–50¢/kWh at Electrify America, ChargePoint): $18–$23 for 45 kWh
Home charging is 3–4× cheaper per mile than rapid charging. This is why a home wallbox is the first thing most EV owners install.
Home Charging Setup — What You Need
A standard 3-pin socket works but is very slow (2.3kW). For practical daily charging, you need a dedicated EV wallbox:
UK: 7kW single-phase wallboxes are standard for homes. Popular options: Ohme (smart, tariff-integrated), Pod Point (free installation offers from some dealers), Andersen A2 (premium), Myenergi Zappi (solar-integrated). Cost installed: £800–£1,200.
US: NEMA 14-50 outlet (50A/240V) gives you ~30 mph charging — install cost ~$200–$500. Dedicated Level 2 EVSE wallbox (32A/240V, 7.7kW) costs $400–$900 for equipment plus $200–$800 installation. Popular brands: ChargePoint Home Flex, JuiceBox 40, Tesla Wall Connector, Emporia Vue EVSE.
Related Calculators
- Electricity Cost Calculator — calculate your home charging cost in detail
- Solar Panel Calculator — offset your EV charging with solar panels
- Battery Life Calculator — understand battery capacity concepts
- Amps to Watts Converter — convert between electrical units
FAQs
Should I charge my EV to 100% every night?
Most EV manufacturers recommend a daily charge limit of 80–90% for long-term battery health. Save 100% charges for long trips where you need maximum range. Most smart wallboxes let you set a default charge limit.
Can I charge an EV with a normal household plug?
Yes, but it's very slow. A standard 13A/240V socket in the UK or 20A/120V socket in the US charges at roughly 2.3kW (UK) or 1.2kW (US). For a 60kWh battery from empty, that's 26 hours (UK) or 50 hours (US). It works for top-ups but not as your primary charging method.
What is a kWh in the context of EV batteries?
A kWh (kilowatt-hour) measures battery capacity the same way a fuel tank is measured in litres or gallons. A 75kWh battery is roughly equivalent to a 40-litre fuel tank for a comparable combustion car in terms of range. Each kWh gives most EVs roughly 3–4 miles of range in real-world conditions.
How much does it cost to charge an EV at home per month?
A typical EV driver covers 800–1,000 miles per month. At 3.5 miles/kWh efficiency and a UK rate of 24p/kWh, that's: (900 miles ÷ 3.5) × £0.24 = £61.70/month for home charging. At the US average of 16¢/kWh: (900 miles ÷ 3.5) × $0.16 = $41.10/month.
What is V2G (Vehicle-to-Grid) charging?
V2G technology allows your EV battery to send electricity back to the grid (or your home) during peak demand. With a compatible vehicle and charger, you can charge overnight on cheap off-peak tariffs and sell back power during the evening peak. Nissan and Volkswagen are expanding V2G compatibility in 2025–2026.
How do I find rapid chargers near me?
Use Zap-Map (UK) or PlugShare (US/global) to find real-time charger availability, network info, and reviews from other EV drivers. Both have apps and browser versions.