DLI to PPFD Calculator

Easily convert between PPFD (µmol/m²/s) and DLI (mol/m²/d)

Both PPFD and DLI measure light that's actually usable for plants (PAR). However, PPFD measures the amount of light your plant receives at a given moment, while the DLI measures the total amount of light your plant receives over an entire day. This is why you need to enter the photoperiod — the amount of time your plant is exposed to light each day.

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Common DLI to PPFD Conversions

The table below shows PPFD values for common DLI inputs across typical indoor-grow photoperiods. For instance, a DLI of 25 mol/m²/d at a 12-hour photoperiod equals a PPFD of 579 µmol/m²/s, while the same DLI over 18 hours equals 386 µmol/m²/s.

DLI (mol/m²/d)	12 h	16 h	18 h	24 h
5	116	87	77	58
10	231	174	154	116
15	347	260	231	174
20	463	347	309	231
25	579	434	386	289
30	694	521	463	347
40	926	694	617	463
50	1,157	868	772	579
60	1,389	1,042	926	694

Formula: PPFD = DLI × 1,000,000 ÷ 3,600 ÷ photoperiod (hours). PPFD values rounded to integer µmol/m²/s.

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DLI to PPFD Calculator

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Common DLI to PPFD Conversions

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