EV Battery Degradation Calculator 2026: Range Loss by Year
Estimate how much range and battery capacity your EV loses by year based on age, mileage, charging habits and climate. 2026 calculator with warranty notes.
Estimate scope & data quality
This tool provides an input-driven estimate. Use the required inputs shown above and review the result limitations below.
- Data quality
- NOT_AVAILABLE
- Result limitation
- Calculator output is not a source-complete customer result.
A tariff credit is distinct from annual savings. If a result is NOT_COMPUTABLE or CONFLICT, it must not be replaced with an estimate or treated as canonical.
How to use this calculator
- Set the EV's age in years (count from the original in-service date, not the date you bought it).
- Enter the original EPA-rated range in miles and, optionally, the usable battery capacity in kWh from the spec sheet.
- Enter annual mileage — more miles means more charge cycles and slightly faster capacity loss.
- Choose your usual charging pattern (mostly home Level 2, mixed, or frequent DC fast charging) and climate.
- Read the estimated remaining capacity, range today, usable kWh and the years until the pack reaches the common 70% warranty threshold.
Understanding your results
Short answer: most modern EVs lose about 2–3% of battery capacity in the first year, then roughly 1–2% per year after that. A 300-mile EV typically still delivers about 255–280 miles after 5 years. Nothing about battery health changed with 2026 federal policy, but the buying math did: there is no federal tax credit for new or used EVs acquired after Sep 30, 2025, so battery condition matters more when you judge a used EV’s price.
How this calculator estimates degradation (modeled, not measured): capacity after year 1 = 100% − 2.5%. Each later year removes a base 1.5% at 12,000 miles/year with mostly Level 2 charging in a moderate climate. That base rate is scaled by mileage (factor = 0.75 + 0.25 × miles ÷ 12,000), by charging pattern (mixed ×1.15, frequent DC fast charging ×1.35) and by climate (hot ×1.2, cold ×1.05). Remaining range = original range × remaining capacity. Real packs usually lose capacity faster early and slower later, so treat results as a planning range, not a diagnosis.
What speeds up degradation: sustained high temperatures, frequent DC fast charging, and keeping the battery at a very high state of charge for long periods. Packs with active liquid thermal management (most EVs sold since about 2017) hold up much better than early air-cooled designs such as the first-generation Nissan Leaf.
Daily habits that help: charge to about 80% for daily driving unless your manufacturer recommends otherwise (many LFP packs are designed to charge to 100%), avoid leaving the car at 100% or near 0% for days, park in shade or a garage in hot weather, and save DC fast charging for road trips.
Warranty context: most automakers warrant EV battery packs for 8 years or 100,000 miles, and many cover capacity falling below about 70% during that period. Terms vary by brand and state, so check your warranty booklet. A dealer or independent shop can run a battery health report before you buy a used EV.
2026 policy status: the federal new clean vehicle credit (§30D, up to $7,500) and used clean vehicle credit (§25E, up to $4,000) ended for vehicles acquired after Sep 30, 2025, under the One Big Beautiful Bill Act (Public Law 119-21). Some states and utilities still offer EV or charger rebates — check your state energy office or DSIRE. This page is not tax advice; confirm with a tax professional.
Frequently asked questions
Direct answers for US homeowners.