Formula
DLI=PPFD ×hours ×3600/10⁶.
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Constant photosynthetic photon flux during the entered photoperiod; no plant-specific lighting recommendation.
Example Calculation
Example inputs
- Constant PPFD: 200 µmol/(m²·s)
- Photoperiod: 16 h
Constant PPFD = 200; Photoperiod = 16. Primary result: 11.52.
Frequently asked questions
How do I use this calculator?
Enter constant ppfd, photoperiod. The result updates automatically. Use Reset to restore the example values.
What method does it use?
DLI=PPFD ×hours ×3600/10⁶.. Constant photosynthetic photon flux during the entered photoperiod; no plant-specific lighting recommendation.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.