Tank Heat-Up Calculator

Need to know how long your tank heater takes to reach temperature, or what size heater a new tank requires? This calculator gives you the answer in seconds. Enter tank volume, fluid type, start and target temperatures, and heater power. Get total BTU required, exact heating time, and heater output — with efficiency adjustment built in. WHAT YOU GET: - Total heat energy required (BTU) - Heating time based on heater wattage - Required heater power for a desired heat-up time - Side-by-side fluid comparison - Efficiency-adjusted results FLUIDS SUPPORTED: Water, oil, and glycol — each with accurate specific heat and density values. UNITS: Fahrenheit or Celsius for temperature. Gallons or liters for volume. COMPARE MODE: See how different fluids, heater sizes, or tank volumes affect your heat-up time side by side. Works completely offline. No account required. Built for process engineers, maintenance technicians, and plant operators who need fast thermal calculations on the floor.