Switch units, compare scales, and reduce calculation mistakes. See converted values, ratios, and scientific notation. Built for engineers, physicists, students, fiber teams, and educators.
Linear to dBW: dBW = 10 × log10(P(W))
Linear to dBm: dBm = 10 × log10(P(mW)) or dBm = 10 × log10(P(W)) + 30
dBW to watts: P(W) = 10^(dBW/10)
dBm to watts: P(W) = 10^((dBm - 30)/10)
Photon energy: E = h × c / λ
Photon flux: Photons/s = P / E
Irradiance: I = P / A
Here, h is Planck’s constant, c is light speed, λ is wavelength, and A is beam area.
| Input | Equivalent watts | Equivalent dBm | Equivalent dBW |
|---|---|---|---|
| 1 mW | 0.001 W | 0 dBm | -30 dBW |
| 5 mW | 0.005 W | 6.9897 dBm | -23.0103 dBW |
| 10 dBm | 0.01 W | 10 dBm | -20 dBW |
| -20 dBm | 0.00001 W | -20 dBm | -50 dBW |
It converts optical power among watts, milliwatts, microwatts, nanowatts, picowatts, dBW, and dBm. It also reports all supported units together after each calculation.
They compress very large or very small power ranges into readable logarithmic values. Engineers often use them for laser links, fiber systems, detectors, and instrument specifications.
No. Logarithmic power units require a positive power value. Zero watts has no finite dBm or dBW value, so those results are shown as undefined.
Wavelength lets the calculator estimate photon energy, optical frequency, and photon flux. Those values are helpful when connecting power measurements to quantum or detector-level interpretations.
Photon flux is the estimated number of photons arriving each second. It equals optical power divided by the energy carried by one photon at the chosen wavelength.
Beam area is used to estimate irradiance, which is power per unit area. This helps compare how concentrated the optical energy is on a surface.
Yes. dBm, wavelength, and low-power linear units are common in fiber optics. The calculator is useful for transmitter checks, receiver budgets, and lab conversions.
Yes, but it keeps scientific notation for tiny or huge values so meaning is preserved. That makes weak optical signals easier to read without losing scale.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.