CLTC vs WLTP Range Calculator
Use this tool to convert EV range figures between CLTC and WLTP. By default, the calculator assumes WLTP is 85% of CLTC, which is a common rule-of-thumb for quick comparisons.
CLTC vs WLTP: What’s the Difference?
If you shop for electric vehicles globally, you’ll quickly notice different official range ratings. A car might be advertised with a high CLTC range in one market and a lower WLTP range in another. This is normal: each number comes from a different testing procedure.
- CLTC (China Light-Duty Vehicle Test Cycle): Used in China, usually produces higher range estimates.
- WLTP (Worldwide Harmonized Light Vehicles Test Procedure): Used in Europe and many other regions, generally stricter and more conservative.
Because CLTC tends to be more optimistic, directly comparing a CLTC value with a WLTP value can be misleading unless you convert them to the same basis.
How This Calculator Works
The calculator uses a simple conversion factor:
- WLTP estimate = CLTC × factor
- CLTC estimate = WLTP ÷ factor
Where the factor is entered as a percentage. For example, 85 means:
- WLTP ≈ 85% of CLTC
- CLTC ≈ WLTP ÷ 0.85
Choosing a Good Conversion Factor
No single factor fits every EV model. Aerodynamics, tires, battery chemistry, speed profile, and climate assumptions all matter. Still, these rough ranges are often useful:
- 80% to 83%: conservative conversion when you want to avoid overestimating WLTP.
- 84% to 87%: common middle-ground for many modern EVs.
- 88% to 90%: optimistic conversion for efficient models with favorable test behavior.
Example Scenarios
Example 1: Converting CLTC to WLTP
A vehicle is advertised at 700 km CLTC. Using an 85% factor:
WLTP ≈ 700 × 0.85 = 595 km
Example 2: Converting WLTP to CLTC
A vehicle is listed as 520 km WLTP. Using the same 85% factor:
CLTC ≈ 520 ÷ 0.85 = 611.8 km
Why Real-World Range Can Still Be Lower
Even WLTP can differ from your day-to-day driving results. Practical range is affected by:
- Highway speeds and strong acceleration
- Cold or very hot weather (HVAC usage)
- Vehicle load, cargo, roof racks, and tire pressure
- Elevation changes and road conditions
- Battery aging over time
If you are planning a long trip or comparing EVs for purchase, treat official ratings as a baseline and include a comfort margin.
Buying Tip: Compare on One Standard
When comparing different EVs from different regions, convert everything into one test cycle first (usually WLTP for cross-market analysis). This avoids “apples-to-oranges” comparisons and gives you a much clearer picture of relative efficiency and expected road-trip performance.
Frequently Asked Questions
Is CLTC always higher than WLTP?
In most cases yes, CLTC range is higher for the same vehicle, though the exact gap varies by model and setup.
Can I use one fixed factor for every EV?
You can for quick estimates, but model-specific data is better. If you have both ratings for one trim, derive that trim’s own factor for more accurate future comparisons.
Does this calculator output miles too?
Yes. Results include both kilometers and miles so you can evaluate range in whichever unit you prefer.