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Net Primary Productivity Calculator

NPP = GPP − R_a (gross minus autotrophic respiration).

Compute the net primary productivity of an ecosystem from its gross primary productivity and autotrophic-respiration loss: NPP = GPP − R_a. Reports the carbon-use efficiency NPP / GPP.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

g C / m² / yr
g C / m² / yr

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

NPP = GPP − R_a; CUE = NPP / GPP.

In depth

Compute the net primary productivity of an ecosystem from its gross primary productivity and autotrophic-respiration loss: NPP = GPP − R_a. Reports the carbon-use efficiency NPP / GPP.