NPK Calculator.
Turn a target N-P-K application rate into straight-fertilizer quantities, an equivalent blend grade and an indicative cost per hectare. Supplier-neutral scoping tool — refine against soil and leaf analysis.
How do you calculate an NPK blend?
An NPK blend is built by converting the target N-P₂O₅-K₂O ratio into kilos of each straight fertilizer, then balancing the blend so each nutrient hits its target rate per hectare without over-applying phosphate or potash.
- Nutrient targets are expressed as N, P₂O₅ and K₂O per hectare.
- P₂O₅ × 0.436 = elemental P; K₂O × 0.83 = elemental K.
- Compare blended straight fertilizers against compounds using current local quotes for the same nutrient delivered.
- Check compatibility before blending — urea and some sources cake or react.
Estimate only — not a quotation. Outputs are indicative planning ranges based on the values you enter and typical commercial benchmarks. Real pricing, specifications and lead times vary by country, site conditions and supplier, and are confirmed only in written offers collected through a private RFQ.
Programme inputs
Indicative only. Straight-fertilizer grades and bulk prices vary by origin, packaging and incoterm.
Turn this estimate into a qualified project
SeedMatchGroup is a supplier-neutral, human-led platform. We do not manufacture or resell equipment — we help buyers specify the project, review relevant suppliers privately and compare the written offers received. Supplier participation and timing are not guaranteed.
Send these numbers to the RFQ Builder
The numbers below were calculated with SeedMatchGroup's NPK Calculator. Indicative — the specialist will confirm scope before contacting suppliers.
13 inputs · assumptions · results
Frequently asked questions
It converts a target N-P₂O₅-K₂O application rate (kg/ha) into the quantity of straight fertilizers needed — urea (46-0-0), DAP (18-46-0) and MOP (0-0-60) — including the nitrogen credited from DAP, then scales to the planted area and applies indicative bulk prices.
DAP supplies 18% nitrogen alongside 46% P₂O₅. The model credits that nitrogen first and only tops up the balance with urea, which is how commercial blenders build a programme.
Yes — read the blend ratio output. If the resulting N:P:K proportion matches a commercially available compound, an RFQ for that grade is usually cheaper to ship than three straights.
No. We are supplier-neutral. We help buyers specify volumes, grades, packaging and delivery windows, then open one private RFQ to qualified producers, blenders and traders.
Understanding the values
What each choice in this calculator means, and how the options differ in practice.
- N — nitrogen
- Drives vegetative growth. Too little yellows the crop; too much gives soft, disease-prone growth and delays fruiting.
- P — phosphorus
- Supports roots, flowering and early establishment. Most needed early; excess ties up micronutrients in the soil.
- K — potassium
- Drives fruit quality, size and stress tolerance. Fruiting crops need rising K through harvest — the most common hidden deficiency.
- Blend ratio
- The ratio between the three, not the total amount. A 1:1:1 blend and a 2:1:3 blend at the same weight deliver very different nutrition.
Illustrative project summary
1 ha multi-span tomato house
A new commercial entrant builds a first multi-span block with fertigation, insect screens and a basic climate computer.
1 ha · Multi-span polyhouse · Tomatoes
Indicative full greenhouse project CAPEX
USD 575K – USD 1.56M
Illustration only, not a real project or quotation. This is the structure, equipment and site-works budget for the example greenhouse, not the price of this calculator’s individual system, seeds or inputs, and not a result calculated from your entries. Excludes land, permits, packhouse, financing costs and working capital.
Based on the published commercial greenhouse cost benchmark. Written offers require a private project review; commercial projects start from USD 250K.
What can change the result?
This is a preliminary planning estimate based on the values you entered. The variables below usually move the outcome most, and should be confirmed with an agronomist, engineer and supplier offers before final design.
- Crop and cultivar — water, climate and support requirements differ per crop
- Growing system (soil, substrate, hydroponic) and plant density
- Water quality and treatment needs (EC, pH, iron, hardness, pathogens)
- Fertigation strategy, dosing accuracy and drain recirculation
Questions this calculator answers
Typical buyer and investor searches this tool is built for, including the markets where we run the most commercial projects.
- fertigation head station sizing and cost per hectare for a commercial project
- fertigation head station sizing and cost for a 2-hectare project — India
- fertigation head station sizing and cost: indicative planning ranges — Kenya
- fertigation head station sizing and cost benchmarks for investors — Saudi Arabia
- fertigation head station sizing and cost under local market conditions — Mexico
- fertigation head station sizing and cost — what to specify in a supplier RFQ
Method and decision path
How to use this result in a commercial project
Use the result to test scope and compare scenarios. It is not a design, agronomic prescription, financing offer or supplier quotation.
1. Enter site evidence
Replace defaults with measured area, climate, water, energy, crop and commercial assumptions.
2. Test scenarios
Change one assumption at a time and record the effect on capacity, cost, demand or return.
3. Validate the duty
Ask the relevant agronomist, engineer or financial adviser to check the inputs and constraints.
4. Prepare a private RFQ
Carry the confirmed scope into a human-reviewed brief so written offers can be compared on the same basis.
Final specifications, performance, prices, supplier participation and timing depend on the site and written supplier responses; none is guaranteed by this calculator.
Tell us five things and we route your brief
These fields decide which specialist and which suppliers see your request. Nothing is submitted here — your answers are carried into the private RFQ.
The USD 250K project threshold applies to capital projects. Recurring fertilizer programmes are reviewed by shipment size, annual volume and sourcing fit.
A sourcing specialist shortlists reviewed providers for your scope and returns comparable offers. Supplier details stay with us — all communication runs through SeedMatchGroup.
Estimate only: these figures are indicative planning numbers, not a quotation. Final pricing, specifications and lead times come from supplier offers after your brief is reviewed.
Plan the project around the numbers
A calculator output is a starting point. Pair it with the planning guides below to align timeline, irrigation, budget and risk before you launch an RFQ.
One private brief, specialist review, private supplier research and a like-for-like comparison.
Spec gaps, MOQ, delivery, Incoterms and evidence labels for seeds, greenhouses, irrigation, fertilizers and produce.
Month-by-month schedule from concept to first harvest across 9 stages.
Design principles for drip, pivot, fertigation and filtration on commercial projects.
How CAPEX, working capital and operating cost drive the project business case.
The ten most expensive planning and procurement pitfalls — and how to avoid them.
Procurement answers behind these numbers
A model output only holds if the scope, contract route and delivery terms match the assumptions. These reference answers cover the commercial decisions that move the figure.
- Turnkey EPC vs separate equipment packages
- What belongs in a greenhouse equipment specification
- Normal payment milestones in equipment contracts
- Which Incoterms to use for greenhouse and irrigation equipment
- How long a commercial greenhouse takes from order to handover
- What is normally the owner's scope on a greenhouse project
Move fertilizer blend supply into a structured RFQ
Editorial · not a sales pitchCalculator outputs are indicative. When your numbers stabilise, a supplier-neutral RFQ turns those estimates into a consistent brief for comparing the written offers that participating suppliers provide.
The facts a complete, supplier-neutral request on this topic includes. Use it as a checklist before submitting.
- The scale you modelled (m², ha, t/h or units) and the CAPEX band it produced
- Which cost lines are in scope for the supplier and which you handle locally
- Specification level: basic, mid-tech or high-tech / fully automated
- Currency, budget approval status and funding source
- Timeline: decision date, delivery window and commissioning target
- Country of installation, import duties and local content requirements
- Operating assumptions you need validated (yield, energy, labour)
- Your calculator output or internal budget sheet
- Any feasibility study, business plan or board budget approval
Opens the RFQ Builder with your cost assumptions attached so suppliers price against the same scope you modelled. You stay in control — nothing is submitted until you review and confirm.
Free to submit · supplier-neutral · reviewed by a specialist before any supplier is contacted.
Running these numbers for a client project?
Agronomists, greenhouse and irrigation consultants use this calculator for feasibility, then hand the project to us for supplier shortlisting, RFQ preparation and quote comparison. You stay client-facing and we work through you.
Your client relationship stays with you — we work through you and never contact your client unless you ask.
Indicative only
- This tool is indicative only.
- It is not financial advice.
- It is not agronomic advice.
- It is not engineering design.
- Final numbers require supplier, agronomist, engineer and local regulatory review.
SeedMatch Group is an independent agricultural project sourcing and RFQ platform. We are not a farm, seed producer, fertilizer manufacturer, irrigation manufacturer, greenhouse builder, EPC contractor, lender or financial advisor. Supplier and project partner outreach is handled only after a commercial project brief is reviewed.
Supplier and manufacturer content is provided for research, transparency and discovery only. Buyers submit one project or RFQ to SeedMatch Group; our team validates and organises it, manages any suitable supplier or manufacturer outreach, and presents the responses through SeedMatch. There is no public directory of company identities, automatic matching, direct messaging or direct buyer-supplier contact.