Net Primary Productivity Calculator
🌍 Ecology. Use the Net primary productivity formula to find npp, gpp, respiration losses: pick the value you want, type the others, and the answer updates as you go.
NPP12000 kJ/m²/yr
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| NPP | kJ/m²/yr |
| GPP | kJ/m²/yr |
| Respiration losses | kJ/m²/yr |
Worked example
Find the npp when GPP = 20000 kJ/m²/yr, Respiration losses = 8000 kJ/m²/yr.
Using NPP = GPP - R: NPP = 12000 kJ/m²/yr.
Frequently asked questions
What is the formula for Net primary productivity?
NPP = GPP - R.
What do the letters stand for, and what units are used?
NPP in kJ/m²/yr, GPP in kJ/m²/yr, Respiration losses in kJ/m²/yr.
How do you calculate npp?
Put the values into NPP = GPP - R. For example, with GPP = 20000 kJ/m²/yr, Respiration losses = 8000 kJ/m²/yr, npp = 12000 kJ/m²/yr.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (npp, gpp, respiration losses) and fill in the others: it rearranges the formula for you.
