Welcome to Steam Engine, a free suite of calculators for your vaping endeavors: Building coils, checking battery drain, mixing e-juice, and more.


Use the top menu to navigate between the sections:

  • The Ohm's law calculator is a simple Ohm's law calculator with Joule heating.
  • The coil wrapping calculator is specialized for winding coils for rebuildable atomizers (RBA).
  • The battery drain calculator shows you the current and power drain on the battery in your e-cigarette.
  • The mod range calculator tells you the optimal resistance range for your regulated mod.
  • The DIY e-liquid calculator lets you select nic strength and VG/PG ratio for the nicotine base liquid and your desired outcome.
  • The Wire Wizard gives you the ability to mix different wires to customize your coil – and your temperature curve.
  • The Converter lets you convert between millimeters, inches, fractional inches, and wire gauges.


  • Steam Engine blog, updates and information about the development and use of the Steam Engine calculators

Video tutorials

An electronic cigarette (e-cig or e-cigarette), personal vaporizer (PV) or electronic nicotine delivery system (ENDS) is a battery-powered vaporizer which simulates the feeling of smoking, but without tobacco combustion. Their use is commonly called "vaping". The user automatically activates the e-cigarette by taking a puff; other devices turn on by pressing a button manually. They are often cylindrical, but come in many variations. Some e-cigarettes look like traditional cigarettes, but others do not. There are disposable cigalikes which are known as first generation "cigalikes" and there are reusable versions. Instead of cigarette smoke, the user inhales an aerosol, commonly called vapor. E-cigarettes typically have a heating element that atomizes a liquid solution known as e-liquid. E-liquids usually contain propylene glycol, glycerin, water, nicotine, and flavorings. E-liquids are also sold without propylene glycol, without nicotine, or without flavors.