Product mass
Applied product · kg
Allowed range: 0 to 1000000
NPK Nutrient Content Calculator
Read N, P₂O₅ and K₂O amounts from a fertilizer label.
Open this toolFertilizer labels commonly state nitrogen alongside phosphorus and potassium oxide conventions.
Enter product mass and the labelled percentages. Read the nutrient amounts and elemental conversions on their stated basis.
Inputs and controls
Label N
Guaranteed analysis · %
Allowed range: 0 to 100
Label P₂O₅
Guaranteed analysis · %
Allowed range: 0 to 100
Label K₂O
Guaranteed analysis · %
Allowed range: 0 to 100
How to use
- Enter product mass.
- Enter label N, label P₂O₅ and label K₂O.
- Select Calculate result. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.
Why use this tool
Separate label and elemental figures help prevent comparisons between unlike nutrient units.
Before relying on the result
P₂O₅ and K₂O are label conventions, not elemental P and K. Conversion factors are also shown; this does not check crop sufficiency.
Tool limitations
P₂O₅ and K₂O are label conventions, not elemental P and K. Conversion factors are also shown; this does not check crop sufficiency.
Questions
Is P2O5 the same as elemental phosphorus?
No. They use different mass conventions. Use the displayed conversion and keep the nutrient basis consistent.
What should I check before using NPK Nutrient Content Calculator?
Check Product mass, Label N, Label P₂O₅ and Label K₂O. Use the exact units shown beside the controls and replace any example values with your own inputs.
Source page last modified: 2026-10-04T13:08:12+00:00. This profile describes the tool; use its page to run it.
Markdown profile