time · cost · range estimation
Demo EV
READY BY 19:32
51 min
20% → 80% · +38.4 kWh
Range after charge
205 miles+154 miles added
Energy added
38.4 kWh
Cost
£17.28
Install: tap Share then Add to Home Screen
CLEVEREST estimates how long an EV charge will take, when it'll be done, what it'll cost, and how far you'll drive afterwards.
The energy needed is simple — your battery size × the percentage you're adding. Turning that into time is the hard part, because charging power isn't constant: it changes with the state of charge.
So rather than one division, the time is added up in 1% steps. At each step the power used is whichever is lower:
Each step's time is its energy ÷ that power. Add them up, plus ~10% for charging losses:
time ≈ Σ ( battery × 1% ÷ powersoc ) ÷ 0.9
Every model's real curve is different, and there's no free, reliable database of them — so instead of pretending to know yours, CLEVEREST uses one typical fast-charge shape, scaled to your car's max rate. It stays near peak through the low-to-mid range, then tapers hard as the battery fills:
That shape is why the estimate mirrors real charging:
It uses a generic curve, not your car's exact one, and it can't see the battery temperature or whether you've preconditioned — both change real-world speed. It's most accurate on a fast charger in the 10–80% range. A solid ballpark, not a stopwatch.
Cost = energy added × your price per kWh. Range = battery size × charge level × your car's efficiency (mi/kWh).
Your cars and settings stay on your device — nothing is uploaded. The app counts anonymous, cookie-free page visits (via GoatCounter) so I can see it's being used; no personal data, and no tracking across other sites.