Free Interactive Tool
Tesla Battery Degradation Calculator
How much capacity has your pack really lost? Will it stay above the 70% warranty line? These estimates are built on published fleet data, not guesswork.
Your estimate
Your pack vs the fleet model
Displayed range is the battery management system's estimate, not a measurement. Calibration drift alone can move it a few percent; a service-mode health test is the exact answer.
Projected capacity curve
How this is calculated
The model combines calendar aging (proportional to the square root of time, because degradation is front-loaded and then plateaus) with cycle wear per equivalent full charge cycle โ and because a full cycle delivers roughly the car's EPA range, a shorter-range pack cycles more often over the same miles and wears slightly faster. It adjusts for chemistry (nickel NCA/NCM, LFP, or 4680 high-nickel NMC), climate heat, habitual charge limit, and fast-charging share. Constants are anchored to Tesla's Impact Report fleet average (roughly 15% loss at 200,000 miles) and Recurrent's 30,000+-vehicle retention studies. 4680 packs (Cybertruck, some Austin-built Model Y) have only shipped at volume since 2023, so their projection carries a wider uncertainty band. A service-center or third-party capacity test is the only exact answer.
Data sources
- Tesla Impact Report (fleet retention data)
- Recurrent โ EV battery retention studies
- Tesla New Vehicle Limited Warranty (70% retention terms)
FAQ
How much does a Tesla battery degrade per year?
Fleet data shows degradation is front-loaded: expect roughly 3-5% in the first couple of years, then a plateau near 1% per year. Tesla's own fleet average is about 15% total loss at 200,000 miles.
Is battery degradation covered by the Tesla warranty?
Yes. Tesla warrants at least 70% capacity retention for 8 years, with a mileage cap of 100k (Model 3 RWD/SR), 120k (3/Y Long Range and Performance) or 150k miles (S/X, Cybertruck). Below 70% inside that window, the pack qualifies for repair or replacement. Exception: Model S/X delivered before February 2020 have an 8-year, unlimited-mile battery warranty that does not include the 70% retention guarantee.
Does Supercharging damage the battery?
Less than commonly believed. Recurrent's study of thousands of Teslas found only a small retention difference between frequent and rare fast-charging. Heat and sustained high state of charge matter more. This calculator models frequent DC fast charging as a mild penalty.
Should I charge my Tesla to 80% or 100%?
Nickel packs (Long Range and Performance) age faster when held at high charge, so 60-80% daily is the standard advice. LFP packs (Standard Range and RWD since about 2021) are designed to be charged to 100% regularly, per Tesla's own guidance.
What about the Cybertruck's 4680 battery?
The Cybertruck (and some 2023 Austin-built Model Y) uses Tesla's 4680 cells โ a high-nickel NMC chemistry in a much larger cylindrical format, roughly 123 kWh in the Cybertruck. It carries the same 8-year, 70% retention warranty with a 150,000-mile cap. Because 4680 packs have only shipped at volume since 2023, long-horizon fleet data doesn't exist yet; this calculator models them like other nickel packs but shows a wider uncertainty band.
How do I check my Tesla's actual battery health?
The car's service mode offers a battery health test, Tesla service can run a capacity check, and third-party services estimate it from charging data. This calculator gives you the expected value to compare such a test against.
Keep reading
- Why a used Model 3 might be the best value EV right now
- EV charging best practices for battery health
- The science of vampire drain and long-term parking
Estimates only, based on published fleet averages. Individual packs vary. Not affiliated with Tesla. See the methodology and sources above.