DLI Calculator

Calculate Daily Light Integral (DLI) from your grow light’s PPFD and photoperiod, or find what PPFD and hours you need to hit a target DLI for any crop.

Calculate mode
Your light setup
Measured at canopy with a PAR meter
Select crop (optional – loads target DLI)

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Daily Light Integral
0 mol/m2/day
0
DLI (mol/m2/day)
0h
Photoperiod
0
PPFD (umol/m2/s)
DLI scale – where your crop falls
0 10 20 30 40 50+ mol/m2/day
0-6: Shade plants   6-12: Herbs, leafy greens   12-20: Veg stage   20-40: Fruiting, cannabis flower   40+: Full sun
PPFD at canopy
Photoperiod
DLI calculation
DLI assessment
Outdoor full sun equivalent ~45-60 mol/m2/day (clear summer day)
To increase DLI by 10%
DLI targets by crop – hours needed at your PPFD
Crop Target DLI Hours @ PPFD Min PPFD@18h
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The calculators and tools on LightingCalc.lighting are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. LightingCalc.lighting makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.