EV Range Converter (CLTC/WLTP/EPA/NEDC)

Use this tool to quickly approximate official EV range figures across CLTC, WLTP, EPA, and NEDC standards while switching between kilometers (km) and miles (mi). The sections below outline formulas, usage tips, and FAQs.

Test standard

Choose the certification protocol the vehicle was originally rated with.

Current input

Enter a range figure and switch between km/mi.

km

WLTP

WLTP = CLTC × 0.82

0km

EPA

EPA = CLTC × 0.82 / 1.168

0km

NEDC

NEDC = CLTC × 0.82 / 0.85

0km

CLTC

Current input

0km

How to Use

  1. Choose the input certification standard (for example, CLTC).
  2. Enter the official rated range and unit (km or mi).
  3. Select Convert to review WLTP, EPA, and NEDC estimates.
  4. Switch km/mi or copy the results whenever needed.

Tip: Results are rounded to the nearest 1 km (or 1 mi).

Conversion Logic & Rationale

These estimates rely on empirical factors observed between public test cycles to approximate rated ranges under different standards. Real-world outcomes vary by vehicle, tires, temperature, speed profile, and many other factors, so treat the results as guidance only.

Current Factors & Rules

  • WLTP ≈ CLTC × 0.82
  • EPA ≈ CLTC × 0.82 ÷ 1.168
  • NEDC ≈ CLTC × 0.82 ÷ 0.85
  • Unit conversion: 1 km = 0.621371 mi (displayed values are rounded)
  • Precision: defaults to 0 decimal places (toggle to 1 decimal in settings)

Update cadence: We refresh the coefficients whenever new public data or additional samples become available.

Last updated:

About Each Standard

What is CLTC?

CLTC (China Light-Duty Vehicle Test Cycle) is the light-duty test cycle used in mainland China. Its milder speed changes often lead to optimistic rated range figures.

What is WLTP?

WLTP (Worldwide Harmonized Light Vehicles Test Procedure) is a newer global procedure with more complex speed phases, typically yielding results closer to moderate real-world driving.

What is EPA?

EPA range ratings are based on the U.S. Environmental Protection Agency procedures. They are comparatively conservative and are often treated as a proxy for everyday driving.

What is NEDC?

NEDC (New European Driving Cycle) is an older European protocol with gentler speed and acceleration profiles. Its practical reference value is limited and it has largely been replaced by WLTP.

Example & Interpretation

Example: With an 800 km CLTC input, the estimator yields roughly WLTP 656 km, EPA 562 km, and NEDC 772 km. Real-world range depends on temperature, speed, terrain, HVAC usage, and payload, so expect deviations from the rated numbers.

Units & Regional Context

  • The United States typically reports EPA range in miles (mi); Europe and many other regions rely on WLTP in kilometers (km); mainland China commonly references CLTC in kilometers (km).
  • You can switch between km/mi at any moment; the toggle only changes the displayed unit and leaves the calculation logic unchanged.

Frequently Asked Questions

Q: Which is closer to reality, WLTP or EPA?
A: EPA is usually more conservative, so many drivers find their mixed driving results align more closely with the EPA rating. WLTP can match well under gentler conditions. The best reference still depends on your environment.
Q: How do I convert CLTC to EPA?
A: Multiply CLTC by 0.82 and then divide by 1.168, or simply choose CLTC as the input standard in this tool and read the EPA result.
Q: Does the conversion work for every vehicle?
A: It is a statistical approximation ideal for quick comparisons and estimates. Specific trims—such as performance tires, off-road packages, or air suspension—can deviate more.
Q: Why is my real-world result different from the estimate?
A: Temperature, average speed, elevation, HVAC usage, aerodynamic drag, and driving style all impact efficiency. Extended highway driving or cold weather typically reduces actual range.
Q: Can I enter miles only?
A: Yes. The tool automatically converts between km and mi and outputs results in whichever unit you choose.