EV Range Converter: EPA, WLTP, NEDC, CLTC, JC08
Convert electric car range between EPA, WLTP, NEDC, CLTC, and JC08 test cycles and see every equivalent at once.
Most conservative, closest to real-world driving.
Current European standard, used here as the reference cycle.
Old European cycle, optimistic, retired after 2018.
Chinese cycle, optimistic, no sustained high-speed phase.
Old Japanese cycle, most optimistic and the roughest conversion.
These conversions are approximations. The standards come from different test cycles, so no exact official conversion exists; the figures use published rule-of-thumb ratios relative to WLTP. NEDC and CLTC land close together because both are similarly optimistic. JC08 is the least-documented conversion, so treat its number as a rough guide.
Electric cars are rated by different test cycles depending on the market, so the same model can advertise several range figures. Enter a range, pick the standard it was measured under, and see the equivalent under every other cycle. The conversions use published ratios relative to WLTP and switch between kilometres and miles.
Electric car range is measured by regional test cycles that drive a fixed protocol on a dynamometer. The US EPA cycle is the strictest and lands closest to real driving. Europe's WLTP is more generous, and the legacy NEDC it replaced was more generous still. China's CLTC and Japan's older JC08 cycle skip or shorten high-speed phases, so they report the highest numbers of all. The same car can therefore carry four or five different range figures depending on where it is sold.
This converter normalizes every figure to WLTP, then scales to each target cycle using published ratios: EPA is about 0.88 of WLTP, NEDC about 1.18, CLTC about 1.20, and JC08 about 1.30. Because all standards are expressed against one reference, the conversions stay internally consistent, and they reproduce the common pairwise rules of thumb (WLTP to EPA near 0.88, CLTC to EPA near 0.72) to within a percent.
Treat the output as an estimate, not a spec sheet. No official formula maps one cycle onto another, since each runs a different speed profile. NEDC and CLTC come out close because both are similarly optimistic, which is expected rather than a mistake. JC08 has the least documented conversion, so its figure is the roughest. For a number you can plan around, the EPA equivalent is usually the safest assumption.
- 1
Enter the range
Type the range figure printed on the spec sheet or listing. The comparison recalculates instantly as you type.
- 2
Pick its test cycle
Choose which standard the number was measured under (EPA, WLTP, NEDC, CLTC, or JC08) and set the unit to kilometres or miles.
- 3
Read the equivalents
The tool shows the same car's range under every other cycle, with your source figure highlighted for reference.
Comparing imported cars
A model sold in China lists a CLTC range. Convert it to EPA or WLTP to compare it fairly against cars rated in your region.
Reading EV reviews
Articles quote whichever cycle the maker published. Translate a WLTP or NEDC headline into the EPA figure you will actually see.
Setting realistic expectations
Convert an optimistic NEDC or CLTC rating down to EPA to estimate the range you can reasonably plan a trip around.
Spec sheet research
Line up range numbers from different markets on the same scale when shortlisting your next electric car.
Is there an official conversion between these standards?
No. EPA, WLTP, NEDC, CLTC, and JC08 each run a different speed and temperature profile, so no regulator publishes a formula to convert one into another. This tool uses widely cited empirical ratios, which makes every result an approximation.
Which range figure is the most realistic?
The EPA estimate is generally closest to real-world driving. WLTP runs about 10 to 15 percent higher, while NEDC, CLTC, and JC08 are progressively more optimistic. Actual range still varies with speed, temperature, terrain, and driving style.
Why are the NEDC and CLTC numbers almost the same?
Both cycles are similarly optimistic and lack a demanding sustained high-speed phase, so they land close together. That overlap is expected, not a bug. EPA sits well below them and JC08 slightly above.
How accurate is the JC08 conversion?
JC08 is a retired Japanese cycle with the least documented relationship to the others, so its figure is the roughest in the set. Use it as a ballpark only. The EPA and WLTP conversions are the best supported.
Does my data leave my browser?
No. The conversion is plain arithmetic that runs entirely in your browser. Nothing you type is uploaded or logged. Your chosen standard and unit are saved locally so they persist between visits.