The car shows you an average consumption figure and the app for one charging network shows you one set of invoices. Neither adds up to what a kilometre costs, because half your charging happens at home on a different tariff. Log each session with where you charged, the kWh, the price and the odometer, and the two ratios you care about keep themselves up to date: cost per kWh and kilometres per kWh.
Opens Log App and adds this log with example entries. You can clear the examples anytime.
On a computer? Scan this with your phone’s camera to set it up there.
Charger, kWh, cost and the odometer. Cost per kWh and the efficiency work themselves out.
Also called an EV charging tracker, kWh log, electric car charging diary or charging logbook.
9:41●●● ▲ ▮
‹EV charging⚙
carmoney
67.8€
Sum Cost · 7 entries
Yesterday
Home
7.2 € Cost · 31.4 kWh Energy · 31895 km Odometer · 168 km Distance
Thu 22 Oct
Home
6.7 € Cost · 28.9 kWh Energy · 31727 km Odometer · 158 km Distance
Tue 20 Oct
DC fast
21.8 € Cost · 34.2 kWh Energy · 31569 km Odometer · 187 km Distance
📍 Raststation Guntramsdorf“18 minutes from 12 % to 70 %. Three times the price of the garage at home.”
Sat 17 Oct
Home
6.9 € Cost · 30.1 kWh Energy · 31382 km Odometer · 164 km Distance
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What you’ll track
The EV charging log, out of the box
One entry per session, with the timer and location always available. Add or rename variables any time in log settings.
Variable
Type
Stats shown
Cost · €
Number
Sum, Average
Charger
Choice · tracked individually
Own stats per value
Energy · kWh
Number
Sum, Average
Odometer · km
Number
Max
Distance · km
Formula · Odometer − Odometer (previous)
Sum
Timer
Built in
Total time, per entry duration
Location
Built in
Pin or place, shown on the log map
Notes, photos, sketches, voice memos
Built in
Attached to any entry
67.8€
Sum Cost
9.7€
Average Cost
213kWh
Sum Energy
30.5kWh
Average Energy
How it works
From install to first entry in a minute
1
Pick “EV charging” during setup
The log is created with the variables above and a few example entries so you can see how it works. Clear them with one tap.
2
Log as you go
Tap plus, fill in what you have, save. Timer, location, notes and photos are there when you want them, hidden when you don’t.
3
Let the stats accumulate
Sum cost sits on the log card, with the rest one tap away. Set a goal if you want a nudge.
Why this log
Built for the way you actually do it
Cost per kWh across every network you use
The log divides the euros in it by the kWh in it, home charging and motorway charging together. That single number is what you compare against petrol, and it is nothing like the price on any one tariff card.
Home, public AC and rapid counted apart
Mark "Charger" as tracked individually and each gets its own totals. You find out what share of your kilometres really comes from the cheap overnight rate, which is usually more than you thought and the reason the car is worth running.
Kilometres per kWh from your own driving
Enter the odometer reading with each session; the log works out the kilometres since the last one and keeps range per kWh as its own figure. Winter against summer, motorway against town — it is the same number the car claims, computed from what you actually paid for.
Everything else in the app
Not just a form. A logbook that thinks with you.
The EV charging log is one log among many you can keep. Every one of them gets the same tools.
💡AI analysis
AI reads the pattern for you
Tap the bulb on EV charging and get a plain-language read of your trends, what changed recently, and a suggested next goal, built only from your own entries.
🎯Goals
Goals, streaks and reminders
Set a target like three times a week, watch the rolling progress bar, keep a streak, and get a reminder at the time you actually log. The app learns that time from you.
📅Calendar
A calendar heatmap per log
Every log has its own month view showing which days you logged. Gaps are obvious, consistency is visible, and one tap opens that day's entries.
🔁Rounds
Several chargers in one entry
One entry can hold a round per charger, each with its own values, and the stats break them out separately.
📷Attachments
Photos, sketches, voice memos
Attach a photo, draw a quick sketch, or record a voice note on any entry. They stay with that entry and come back on every device you sign in on.
🗺️Map
Every entry on a map
Drop a pin or search for the place. Each log has a map view of everywhere you logged, and saved places open directly in Google Maps.
🔍Search
Search across everything
Find an entry by title, note or value across every log, filter by date or location, and jump straight to it.
🔒Privacy
Yours, offline first
Entries save on your phone first and sync when you sign in. No account needed to start, no feed, no one else sees your data.
Who keeps a charging log
People who switched from diesel and want the comparison to be honest rather than hopeful — the ones who know what the old car cost per kilometre and refuse to guess at the new one. Company-car drivers who are reimbursed per kWh charged at home and need a record their employer will accept. And people on the second winter with the car, who suspect the range has dropped and want a figure instead of a feeling.
It also suits anyone who charges in more than one place. If every electron came from the same wallbox, the annual bill would tell you everything. As soon as there is a rapid charger on the motorway and a free one at the supermarket in the mix, only a log knows what the mixture cost.
What three weeks of charging shows
The split by charger is the first surprise. In the sample above, one rapid session costs more than three nights at home put together while supplying about the same energy. Seeing those two totals next to each other is what turns "rapid charging is expensive" into a number you plan around, and usually into a habit of leaving with a full battery.
Kilometres per kWh is the figure to watch across a season rather than a week. It sinks in the cold and recovers in spring, and a sudden drop that the weather does not explain is worth a tyre-pressure check before it is worth worrying about the battery. Keep the log for a year and you have the one thing no dashboard gives you: what your car costs to move, in the conditions you actually drive it.
Questions
Frequently asked
How do I get kWh per 100 km out of this?
Divide 100 by the kilometres-per-kWh figure. At 5.4 km/kWh that is 18.5 kWh per 100 km. The log keeps the ratio the way round that stays readable as a single number; the conversion is one division whenever you want it.
Do I type in the distance?
No. Type the odometer reading and the log works out the kilometres since the last session itself. The first session has no reading before it, so its distance stays blank; from the second one on, every charge has one.
My home charging is not metered separately. What then?
Use the kWh the wallbox or the car reports and your electricity tariff for the price. It is close enough for a running average, and it is the only figure a utility bill will never give you on its own.
Can I log a plug-in hybrid or two cars?
One log per car. Both can carry the tag "car", so the overview groups them while the totals and the ratios stay separate.
