How to Calculate EV Charging Cost in China
How does this calculator estimate the cost and time to charge an electric vehicle (battery electric vehicle, or BEV) in China? This page opens up the machine: the exact formula, the variables it uses, and where every electricity rate comes from, including the date each was checked. The aim is transparency. Once you can see the method, you can check any figure on this site for yourself, and you can work out the cost for your own car at the China calculator.
By mht-dev, Frontend Engineer & Creator
A frontend engineer who bought a first electric car in March 2026 and built EV Charge Calculator while working out the real cost of charging it, writing every guide from an everyday new EV owner's perspective.
What the calculator works out
The core calculation is simple and the same in every market: the calculator turns a battery-percentage difference into energy (kWh), then uses that energy to work out both the cost and the time. There are no hidden numbers, just three plain formulas run over the car you pick and the electricity rate you choose. Because the maths is pure, the same inputs always give the same answer, which means the calculation can be tested on its own, separately from the page you see.
The inputs are: the car's usable battery capacity (kWh), the current and target battery percentages (%), the charger power (kW), and the electricity rate per kWh. For any electric vehicle (BEV) already in the China preset list, the battery size and the peak DC charger power are filled in for you, so you only set the percentages and confirm the rate. Those values feed the formula below.
The formula we use
- Energy needed
- energy (kWh) = battery capacity × (target % − current %) ÷ 100
- Charging time
- time (hours) = energy ÷ charger power (kW)
- Cost
- cost = energy × electricity rate per kWh
Skip the math and try our EV charging calculator
Where the rate figures come from
This calculator does not guess the price of electricity. Residential power in China uses a tiered ladder structure, and it is usually layered with time-of-use peak and valley pricing: the daytime rate is higher, the overnight valley rate is cheaper, and in many areas you can apply for an EV-specific overnight tariff. Public charging is not a single number either: it is the electricity fee (at the local rate) plus a service fee, and the two added together are what you actually pay per kWh. The calculator stores representative rates under this structure, each with the date it was checked. The sources table below lists the rates currently used for China, so every estimate can be traced back to where it came from. How much a given charge actually costs is computed by the calculator from current rates, never hardcoded here.
Because this site is fully static and does not fetch live prices when you open it, the rates are refreshed by rebuilding and re-publishing the site whenever an official figure changes, normally at the quarterly rate review. The latest update date is shown under the sources table so you know how current the numbers are. Two real-world costs sit outside this per-kWh method on purpose: public chargers sometimes add a per-session or idle (overstay) fee, and your own bill can sit above or below the representative value used here depending on your region and tariff plan, so always sanity-check against your latest electricity bill.
Electricity rate sources
| Tariff | Rate per kWh | Source | As of |
|---|---|---|---|
| Home charging (residential) | ¥0.60 | Shanghai FGW first-tier 0.617 / Beijing ~0.49 / national avg 0.532 | 2026-06-03 |
| Home charging (overnight valley) | ¥0.32 | Shanghai valley 0.307 / Beijing EV-special valley 0.31 | 2026-06-03 |
| Public AC charging | ¥1.20 | PMC levelized 1.148 (2023 base) / Shanghai service-fee cap 1.3 | 2026-06-03 |
| Public DC fast charging | ¥1.80 | Shanghai/Sina 2025-26 peak all-in 1.6-2.5 / service-fee cap 1.3 | 2026-06-03 |
| Public DC fast charging (off-peak) | ¥1.00 | Shanghai/Sina valley all-in 0.8-1.2 (0:00-07:00) | 2026-06-03 |
Rates updated 2026-06-03
A worked example: how the formula plays out
Here is the method in one walk-through: say an electric vehicle (BEV) has a usable battery of 60 kWh and you charge it from 20% to 80%, which adds 60% of the pack, so the energy needed is 60 multiplied by 60%, which is 36 kWh. Multiply that 36 kWh by the per-kWh price of your chosen tariff to get the cost of the charge, and divide the 36 kWh by the charger power (kW) to get the time. That is the whole calculation, with nothing typed in by hand. The comparison table below uses the same formula to put a popular China BEV side by side, charging at home (residential rate, AC charging) versus a public DC fast charger (public DC rate, fast charging), so changing a rate in the configuration changes these numbers automatically on the next rebuild.
| Scenario | Energy | Time | Cost |
|---|---|---|---|
| At home (AC) 20% → 80% | 34.2 kWh | 3 hours 7 minutes | ¥20.52 |
| Public DC 20% → 80% | 34.2 kWh | 12 minutes | ¥61.56 |
Use it for your own car
The figures above use one representative car and one representative set of rates to make the method clear. To get a result tailored to you, go to the China calculator: pick your own car, enter your current and target battery percentages, and choose the tariff that matches how you charge, such as the residential rate, the overnight valley rate, public AC, or public DC fast charging. The calculator runs the same formula explained on this page to give you the energy, cost, and time for your own charge.
Frequently asked questions
How does the calculator work out EV charging cost in China?
- It uses the car's battery capacity to turn a battery-percentage difference into energy (kWh), then multiplies that energy by the electricity rate per kWh to get the cost, and divides it by the charger power to get the time. No fixed charge total is hardcoded here: the actual amount depends on your car, your charging range, and the tariff you pick, and is computed live by the calculator. The sources table higher up this page lists the rates used. Pick your own car and rate at the China calculator to get a figure tailored to you.
Are the electricity rates used accurate and up to date?
- Each rate is taken from a sourced, dated reference and stored with the date it was checked, which is shown in the sources table on this page. Because the site is static, rates are refreshed by rebuilding it when an official figure changes, typically at the quarterly review for China. Note that residential power in China uses a tiered, time-of-use structure and public charging adds a service fee, and your own bill will differ by region and tariff plan, so check it against your latest statement.
Why is public DC fast charging faster but more expensive?
- Because the formula divides energy by charger power: a public DC fast charger delivers high power, so the charge takes less time, while charging at home on AC is lower power and takes longer. But the public DC price per kWh (electricity plus service fee) is usually higher than the home residential rate, especially at peak hours, so although it is quicker, it costs more. That is why home charging is the cheaper default for everyday driving and public DC is best kept for trips and emergencies. Exactly how much faster and how much dearer for your car is computed by the calculator.