Power per square millimetre of coil surface (mW/mm²). The WINDBAR coil wrapping calculator paints a typical 120–350 mW/mm² band. Not a flavor guarantee.
Rebuildable users watch heat flux when a wrap feels harsh or slow. If the band reads hot, lower wattage or change wire mass before you assume the liquid is the problem.
At 25 W on a coil with 80 mm² surface, heat flux is about 310 mW/mm² — inside many builders’ balanced band.
Also called: mW/mm², heat flux calculator
WINDBAR tools for this term
Related terms
Heat flux questions
What is a good heat flux range?
Many round-wire builds sit near 120–350 mW/mm² in educational use. Taste and airflow still decide; the coil wrapping calculator paints that band as a starting map.
Does high heat flux always mean harsh flavor?
Not always — wire mass, wicking, and airflow matter. If flavor turns sharp, lower wattage or increase surface area before you blame nicotine strength.
Educational glossary for adults 21+ only. Not medical advice. Follow manufacturer instructions and local laws.