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Calcimator

Color Temperature Calculator

Convert Kelvin to Mired and calculate gel correction values.

Inputs

K

Results

Mired Value

313

Mired Shift from Daylight134
CTO Equivalent102%
CTB Equivalent0%
Warm/Cool Index (-2 to 2)-1
How to Use This Calculator
  1. Enter the Color Temperature in Kelvin — daylight is ~5600 K, tungsten is ~3200 K.
  2. Read the Mired Value (1,000,000 ÷ K) — gels and filters are rated in mireds for precision.
  3. Use the Mired Shift to calculate how much correction gel is needed to match a target source.
  4. Check the CTO/CTB Equivalent (%) to select the right Lee or Rosco gel from your kit.

How the result changes with Color Temperature

Color TemperatureMired Value
2,900345
7,650131
13,35075
18,10055

What each input means

Color Temperature
Light source color temperature in Kelvin (e.g., 3200K = tungsten, 5600K = daylight).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Color Temperature = 3200 = 1 input(s) provided
  2. Calculate Mired Value
    Mired Value
    313 = 313
  3. Calculate Mired Shift from Daylight
    Mired Shift from Daylight
    134 = 134
  4. Calculate CTO Equivalent
    CTO Equivalent
    102 = 102

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