Compost Nutrient Calculator
Value the N-P₂O₅-K₂O in compost (~0.8:0.4:0.8%) and the urea, DAP and MOP it replaces, with first-year nitrogen availability accounted for.
Garden/farm compost averages 0.8-0.4-0.8% N-P-K with ~30% first-year N. Its biggest value is organic matter and soil structure rather than headline NPK, so judge it on both counts.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Organic and integrated-nutrient farmers use the free Compost Nutrient Calculator to put a rupee value on their compost and work out how much bagged fertilizer they can safely cut back.
About Compost Nutrient Calculator
Mature compost averages about 0.8-0.4-0.8% N-P₂O₅-K₂O with roughly 30% first-year nitrogen. Its real value is as much in organic matter and soil structure as in headline NPK. This tool puts a rupee figure on the nutrients your compost supplies so you can budget the rest as fertilizer.
How to use Compost Nutrient Calculator
- 1Enter your compost application rate and field area.
- 2Read the total N, P₂O₅ and K₂O supplied and the fertilizer it replaces.
- 3Cut your bagged-fertilizer plan by the equivalents shown, then follow the application note.
Why use Compost Nutrient Calculator?
- ✓Uses a realistic 0.8:0.4:0.8% N-P₂O₅-K₂O analysis for compost
- ✓Applies a 30% first-year nitrogen availability factor — organic N releases slowly
- ✓Converts the nutrients into urea, DAP and MOP equivalents and a rupee value
- ✓Free, instant and fully in-browser
Frequently asked questions
What is the nutrient value of compost?+
Compost typically analyses around 0.8% N, 0.4% P₂O₅ and 0.8% K₂O. Roughly 30% of the nitrogen is available in the first year; the rest builds soil over following seasons.
Why is only part of the nitrogen counted the first year?+
Organic nitrogen is locked in complex compounds that soil microbes mineralise gradually. About 30% becomes plant-available in year one for compost; the carry-over keeps feeding later crops, which is why organic matter improves long-term fertility.
How and when should I apply it?+
Garden/farm compost averages 0.8-0.4-0.8% N-P-K with ~30% first-year N. Its biggest value is organic matter and soil structure rather than headline NPK, so judge it on both counts.
Is this calculator free and private?+
Yes — completely free with no sign-up, and every calculation runs in your browser so nothing you enter is uploaded.
Related Agri tools
Tractor Fuel Consumption Calculator
Estimate your tractor's diesel consumption per hour from its horsepower, load and specific fuel consumption.
● LiveTractor Fuel Cost Per Acre Calculator
Convert your tractor's fuel use per hour into diesel litres and cost per acre for any field operation.
● LiveImplement Field Capacity Calculator
Calculate the effective field capacity (ha/h and acres/h) of any implement from width, speed and field efficiency.
● Live