Photons per second to micromoles of photons per second
Type a value in photons/s to get it in µmol/s instantly.
1.661×10⁻¹⁸µmol/s
Nothing on our list is smaller: single-photon counting is 1,000× more. That is about 1.661×10⁻¹⁸ µmol of photons a second.
What it means
How many photons?
This counts photons arriving, not photons detected. A detector’s quantum efficiency decides how many of them are actually recorded.
The math
How to convert photons/s to µmol/s
Each photon carries E = hc ÷ λ, so photons per second = watts × λ(nm) ÷ 1.986 × 10⁻¹⁶. The figures below use the wavelength selected above.
Example: 1 photons/s = 1.661×10⁻¹⁸ µmol/s.
The table below is for Ultraviolet, 254 nm.
Every unit
Your flux in every unit
Tables
photons/s to µmol/s conversion table
| photons/s | µmol/s |
|---|---|
| 1,000 photons/s | 1.661×10⁻¹⁵ µmol/s |
| 1,000,000 photons/s | 1.661×10⁻¹² µmol/s |
| 1×10⁹ photons/s | 1.661×10⁻⁹ µmol/s |
| 1×10¹² photons/s | 1.661×10⁻⁶ µmol/s |
| 1×10¹⁵ photons/s | 0.00166054 µmol/s |
| 1×10¹⁶ photons/s | 0.0166054 µmol/s |
| 1×10¹⁷ photons/s | 0.166054 µmol/s |
| 1×10¹⁸ photons/s | 1.66054 µmol/s |
| 1×10²⁰ photons/s | 166.054 µmol/s |
µmol/s to photons/s conversion table
| µmol/s | photons/s |
|---|---|
| 1,000 µmol/s | 6.022×10²⁰ photons/s |
| 1,000,000 µmol/s | 6.022×10²³ photons/s |
| 1×10⁹ µmol/s | 6.022×10²⁶ photons/s |
| 1×10¹² µmol/s | 6.022×10²⁹ photons/s |
| 1×10¹⁵ µmol/s | 6.022×10³² photons/s |
| 1×10¹⁶ µmol/s | 6.022×10³³ photons/s |
| 1×10¹⁷ µmol/s | 6.022×10³⁴ photons/s |
| 1×10¹⁸ µmol/s | 6.022×10³⁵ photons/s |
| 1×10²⁰ µmol/s | 6.022×10³⁷ photons/s |
Quick answers
Quick answers
- How many µmol/s is 1 photons/s?
- 1 photons/s is 1.661×10⁻¹⁸ µmol/s.
- How many µmol/s is 10 photons/s?
- 10 photons/s is 1.661×10⁻¹⁷ µmol/s.
The units
About these units
Photons per second (photons/s)
The raw count of photons arriving each second.
Micromoles of photons per second (µmol/s)
How photochemistry and plant science count light.
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