Temperature & Humidity

  • Boiling Point Altitude Calculator
    Find the boiling point of water at any altitude in °C and °F, plus atmospheric pressure. Free, instant boiling point altitude calculator.
  • Saturation Vapor Pressure Calculator
    Calculate saturation vapor pressure from air temperature using the Tetens equation. Get results in kPa, hPa (mbar), and Pa instantly.
  • Vapor Pressure Deficit (VPD) Calculator
    Calculate Vapor Pressure Deficit (VPD) in kPa from air temperature and relative humidity. Free grow-room and greenhouse VPD tool with SVP and AVP.
  • Specific Humidity Calculator
    Calculate specific humidity from water vapor pressure and total air pressure using q = 0.622e/(p - 0.378e). Get results in g/kg and kg/kg instantly.
  • Frost Point Calculator
    Calculate the frost point temperature from air temperature and relative humidity using the Magnus formula for saturation over ice (below freezing).
  • Fahrenheit to Kelvin Calculator
    Convert Fahrenheit to Kelvin instantly with K = (F + 459.67) x 5/9. Shows step-by-step working and flags non-physical values below absolute zero.
  • Temperature Conversion Calculator
    Convert temperature between Celsius, Fahrenheit, Kelvin, Rankine and Reaumur. Pick any two scales, enter a value, and see the exact converted result with steps.
  • Kelvin to Fahrenheit Converter
    Convert Kelvin (K) to Fahrenheit (°F) instantly with step-by-step working. Uses °F = K × 9/5 − 459.67. Free, accurate temperature converter.
  • Kelvin to Rankine Converter
    Convert Kelvin (K) to Rankine (°R) instantly. Uses °R = K × 9/5 with full conversion steps, reference points, and a worked example.
  • Fahrenheit to Celsius Converter
    Convert temperatures between Fahrenheit and Celsius in both directions. Free °F to °C and °C to °F converter with formula and worked solution steps.
  • Kelvin to Celsius Converter
    Convert Kelvin (K) to degrees Celsius (°C) instantly. Enter a temperature in Kelvin and see the result plus a step-by-step worked solution.
  • Fahrenheit to Rankine Converter
    Convert Fahrenheit to Rankine (°F to °R) instantly. Uses °R = °F + 459.67 and shows the full conversion steps. Accepts decimals and negatives.
  • Celsius to Kelvin Converter
    Convert degrees Celsius (°C) to Kelvin (K) instantly. Uses K = °C + 273.15 with full calculation steps and reference points like water freezing and boiling.
  • Celsius to Rankine Converter
    Convert Celsius to Rankine instantly. Enter a temperature in degC and get degR using the formula degR = degC x 1.8 + 491.67, with step-by-step working.
  • Rain to Snow Calculator
    Convert rainfall to expected snowfall using the snow-to-rain ratio. Estimate inches of snow from liquid precipitation (5:1 to 20:1).
  • Mixed Air Temperature Calculator
    Calculate the mixed air temperature of two combining airstreams from their flow rates and temperatures using the flow-weighted average formula.
  • Wet Bulb Temperature Calculator
    Calculate wet bulb temperature from air temperature and relative humidity using the Stull approximation. Get results in °C and °F instantly.
  • Thermal Equilibrium Temperature Calculator
    Find the final equilibrium temperature when two substances mix, using mass, specific heat and initial temperatures. Free physics & chemistry tool.
  • Mixing Ratio of Air Calculator
    Calculate the mixing ratio of moist air from vapor pressure and total pressure using w = 0.622·e/(P−e). Get results in kg/kg and g/kg instantly.
  • Relative Humidity Calculator
    Calculate relative humidity (%) from air temperature and dew point using the Magnus saturation vapor pressure formula. Fast, accurate, free.
  • Cloud Base Calculator
    Estimate the height of cumulus cloud bases from surface temperature and dew point using the standard spread method. Free aviation cloud base calculator.
  • Absolute Humidity Calculator
    Calculate absolute humidity in g/m³ from temperature and relative humidity using the Magnus-based formula. Fast, free, and accurate.
  • Apparent Temperature Calculator (Improved Missenard Formula)
    Compute the apparent (feels-like) temperature from air temperature, relative humidity and wind speed using the improved Missenard formula. Universal, in degC, %, m/s.
  • Temperature Unit Converter (Kelvin, Celsius, Fahrenheit, Rankine)
    Convert any temperature between Kelvin, Celsius, Fahrenheit and Rankine at once. Enter one value, pick its unit, and get all four scales instantly.

Categories