Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Lumens (lm)

Required number input.

Area Square Meters (m²)

Required number input.

Average luminance of an ideal Lambertian emitter from luminous flux and emitting surface area. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Brightness Nits (cd/m²)

The resulting brightness nits returned as a number.

• Display brightness, contrast, pixel density, refresh power, and backlight current depend on panel mode, measurement pattern, viewing angle, ambient light, transfer function, refresh behavior, and power-management state. Nominal specifications may use different test methods.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Display Backlight Current

  Calculate average backlight supply current from measured electrical power and supply voltage.

• Display Contrast Ratio

  On/off display contrast ratio from white and black luminance measured under the same conditions.

• LED Efficacy

  Compute the luminous efficacy of an LED from its luminous flux and electrical power.