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True Cashew KOR Calculator

Your Kernel Output Ratio (KOR) is the single most important performance number in cashew processing. It tells you exactly how many kilograms of finished white kernel your factory extracts from every 80-kilogram bag of Raw Cashew Nut (RCN). A higher KOR means more revenue from the same raw material. A lower KOR means money left on the factory floor. The True Cashew KOR Calculator on this page tracks your actual, measured KOR across all five processing stages — steaming, shelling, drying, peeling, and re-heating — six days a week, with automatic mass balance verification, so your KOR figure is not an estimate. It is the real number from your production floor.

OUTTURN is the cashew industry term for Kernel Output Ratio — and it is the most critical quality and profitability metric in the entire cashew value chain. A difference of just 1 KOR point on a 10-tonne daily RCN throughput is worth over 125 kg of finished kernel per day.

What Is KOR — Kernel Output Ratio?

KOR, or Kernel Output Ratio, is the weight of finished white cashew kernel extracted from a standard 80-kilogram bag of Raw Cashew Nut. If your processing line produces 22 kg of export-grade white kernel from one 80-kg RCN bag, your KOR is 22. The metric is universal across the cashew industry — buyers, processors, and traders all quote KOR when discussing procurement, pricing, and processing contracts.

The formula for KOR is straightforward:

Formula Component	Value / Description
Final White Kernel Output	Grams per kg of RCN (measured after all 5 stages)
KOR Calculation	(Final Output g ÷ 1,000) × 80 = KOR value
Example (W-210 Grade)	277 g/kg RCN → (277 ÷ 1,000) × 80 = 22.16 KOR
Alternative Expression	Yield % × 0.8 — or simply Final Output ÷ 12.5

KOR and White Kernel Yield Percentage express the same underlying reality — the efficiency of your extraction — but in different units. KOR is the industry-standard commercial metric because it directly represents the physical quantity of saleable product from a standard trading unit. Most export contracts specify a minimum KOR as part of RCN purchase terms.

KOR Benchmarks by RCN Grade

Not all RCN produces the same KOR — kernel size, shell thickness, moisture content, and nut count per pound all influence the maximum achievable KOR for a given grade. The table below shows industry-standard KOR benchmarks for the most common grades:

RCN Grade	Nut Count (nuts/lb)	Typical KOR Range	Notes
W-180	≤ 180	22 – 24	Largest kernels, highest KOR potential
W-210	181 – 210	20 – 22	Most common processed grade globally
W-240	211 – 240	21 – 23	Good kernel-to-shell ratio
W-280	241 – 280	20 – 22	Smaller kernels, still good yield
W-320	281 – 320	19 – 21	Smaller, thinner shells, more breakage risk
African Mixed	Varies	18 – 21	Wider variance due to mixed origin/grade
Indian Domestic	Varies	19 – 22	Highly variable by crop season

Important: A KOR that exceeds the grade benchmark does not necessarily mean better processing — it may indicate excessive moisture in the finished kernel (a quality defect) or incorrect weighing. A KOR significantly below benchmark signals a processing loss problem at a specific stage. Use the mass balance verification in this calculator to identify the exact stage causing excess loss.

How to Use the True KOR Calculator — Step-by-Step

This calculator mirrors the full five-stage cashew processing flow. You enter measured weights from your factory floor for each day of the week (Monday through Saturday). The calculator computes your daily KOR, week average KOR, and a complete mass balance verification — automatically. No spreadsheets, no formulas to manage.

Step 1: Enter Your Factory Information

Fill in your factory or processor name, the RCN grade you are processing (e.g. W-210, W-240, African), the week number, and the month and year. This information labels your results — it does not affect calculations.

Step 2: Set Your RCN Batch Weight per Day

Enter the actual weighed intake of Raw Cashew Nut for each active production day in the “RCN Received — Batch Weight (kg)” row. This is the gate weight of RCN entering the processing line on that day. Set any inactive day to 0 to exclude it from averages. All stage losses are calculated per kg of RCN — so the batch weight is needed only to compute actual kg produced at the end.

Step 3: Enter Stage 1 — Steaming Data (Steam Moisture Absorbed)

Weigh the RCN before and after steaming. The difference, expressed as grams per kg of RCN, is your Steam Moisture Absorbed. Typical values are 15–40 g/kg RCN. This is a GAIN — steam adds weight before shelling. Higher steam moisture means the shell is better softened, which generally improves extraction quality if cutting machine settings are correct.

Step 4: Enter Stage 2 — Shelling and Cutting Data

Enter three values: (a) Shell Removed — the total weight of whole shell fraction separated by the cutting machine, typically 640–720 g/kg RCN; (b) CNSL Recovered — the Cashew Nut Shell Liquid extracted from the shell, typically 180–260 g/kg RCN, recorded separately as it is a valuable by-product credit and does not affect the kernel mass balance; (c) Shelling Machine Loss — fines, dust, and unrecovered fragments at the cutter, typically 10–40 g/kg RCN. This is the stage most directly controlled by cutting machine quality and blade condition.

Step 5: Enter Stage 3 — Drying Data (Total Drying Loss)

Enter the total moisture loss from the kernel during the drying stage (Borma oven, tray dryer, or centrifuge dryer). This represents approximately 10–14% of the kernel weight entering the dryer. Typical values are 25–45 g/kg RCN. Over-drying increases brittleness and breakage in the peeling stage; under-drying risks mould and poor testa removal.

Step 6: Enter Stage 4 — Peeling Data (Three Values)

Enter: (a) Testa (Red Skin) Removed — the cashew red/brown skin layer, typically 5–10 g/kg RCN, approximately 2–3% of kernel weight; (b) Peeling Dust and Fines — waste from pneumatic blast peeling, typically 2–5 g/kg RCN; (c) Grade Sort Reject at Peeling — discoloured, scorched, or sub-grade kernels rejected at the peeling inspection line, typically 3–8 g/kg RCN. A high Grade Sort Reject figure indicates problems at Stage 2 or Stage 3 — over-cooking, blade damage, or incorrect dryer temperature.

Step 7: Enter Stage 5 — Re-Heating and Final QC Data

Enter: (a) Moisture Regain in Re-Heater — the controlled humidification step that restores pliability to the dried kernel before packing, typically 1–4 g/kg RCN. This is also a GAIN, adding a small amount of weight; (b) Final QC and Packing Reject — the visual sort immediately before packing, typically 1–3 g/kg RCN. A high Final QC Reject suggests that quality issues are escaping the Stage 4 sort.

Step 8: Click “Calculate My True KOR” and Read Your Results

The calculator will return your daily KOR for each active day, your week average KOR, white kernel yield percentage, actual kg produced per week, and a full stage-by-stage mass flow breakdown in grams per kg of RCN. The mass balance verification will confirm whether your measurements are internally consistent — a correctly balanced result should equal 1,000 g/kg RCN within a tolerance of ±5 grams.

The 5-Stage Cashew Mass Balance — How Your KOR Is Built

Every kilogram of RCN that enters your factory gate passes through five distinct processing stages before it becomes export-grade white kernel. Understanding how mass is gained or lost at each stage is the foundation of KOR management. The calculator tracks all five stages simultaneously.

Stage	Process	Mass Effect	KOR Impact
Stage 1	Steaming — Shell Softening	+15 to +40 g/kg RCN (GAIN)	Insufficient steaming → poor extraction at Stage 2, lower KOR
Stage 2	Shelling / Cutting — Kernel Extraction	−660 to −760 g/kg RCN (largest loss stage)	Machine precision and blade condition are the single biggest KOR lever
Stage 3	Drying — Moisture Removal	−25 to −45 g/kg RCN	Over-drying increases breakage; under-drying increases Stage 4 reject
Stage 4	Peeling — Testa and Sort	−10 to −23 g/kg RCN	High grade-sort reject indicates upstream damage from Stages 2–3
Stage 5	Re-Heating and Final QC	+1 to +4 g/kg, −1 to −3 g/kg	Small net effect but critical for finished moisture spec compliance

The mass balance formula that the calculator verifies after your inputs is:

Mass Balance = Final White Kernel Output + Shell Removed + Shelling Machine Loss + Drying Loss + Testa Removed + Peeling Dust + Grade Sort Reject + Final QC Reject − Steam Moisture Absorbed − Reheat Moisture Gain = 1,000 g / kg RCN Note: CNSL Recovered is excluded from this mass balance because it is extracted from the shell fraction after removal — it is already accounted for within the shell weight.

7 Key Factors That Determine Your Actual KOR

KOR is the output of a complex multi-variable system. Understanding which variables have the largest effect allows processors to prioritise improvements correctly.

•  RCN Quality and Grade: The grade of incoming RCN sets the maximum achievable KOR. W-210 grade RCN from a high-quality origin can yield KOR 22–23 in a well-run facility. The same grade from a stressed crop season may peak at 20–21. Procurement quality is the ceiling; processing efficiency determines how close you get to it
•  RCN Moisture at Reception: Higher RCN moisture content at intake is detrimental to processing — it is not beneficial. RCN with moisture above 12% is prone to mould, uneven steaming response, and poor kernel extraction. The ideal intake moisture for processing is 8–10%.
• Steaming Time and Pressure: The steaming stage softens the shell, making it brittle during the 15–18 hour conditioning rest that follows. Insufficient steam → the shell is still pliable → the cutting blade crushes rather than cuts → higher shelling machine loss and lower KOR. Over-steaming → kernel becomes soft → scorching risk during drying → higher grade-sort reject.
• Cutting Machine Quality and Blade Condition: The cutting machine is the single largest lever for KOR improvement in a factory that already has good RCN and a controlled steaming process. A precision cutting machine with correctly tensioned blades and accurate kernel-path alignment extracts whole kernels cleanly, minimising the “shelling machine loss” figure in Stage 2. A worn blade or poorly aligned machine creates split kernels and high fines — both reducing your KOR.
• Drying Profile (Temperature and Duration): Both over-drying and under-drying reduce KOR. Over-dried kernels are brittle: they fracture during peeling, increasing the Grade Sort Reject at Stage 4. Under-dried kernels carry excess moisture that shows up as a higher Drying Loss figure when you later re-measure — or causes quality failures at the export grade check.
•  Peeling Efficiency and Testa Removal: Mechanical peeling by centrifugal blast or pneumatic systems must remove the testa without fracturing the kernel. If testa sticks (indicating under-drying) the operator increases blast pressure, increasing peeling dust and physical kernel damage. The Peeling Dust and Grade Sort Reject values in the calculator will both rise.
•  Operator Training and Measurement Discipline: KOR tracking only improves factory performance if the measurements are accurate and consistent. The most valuable use of this calculator is not a single week’s result — it is week-on-week trend data that surfaces where losses are growing before they become a major problem.

How OUTTURN Cashew Cutting Machines Are Engineered to Maximise KOR

At Stage 2 — the shelling and cutting stage — the performance of your cutting machine directly determines what percentage of the kernel inside each shell arrives at Stage 3 whole, undamaged, and within spec. This is the stage where most KOR is won or lost.

OUTTURN cashew cutting machines are manufactured in Binh Phuoc, Vietnam — the heart of the world’s largest cashew processing industry — and are engineered around one design objective: extract the maximum kernel weight per batch with minimum fines and minimum half-kernel breakage.

OUTTURN Feature	KOR Effect
Precision blade alignment per head	Reduces shelling machine loss to 10–20 g/kg RCN vs. 25–40 g/kg on standard machines
Adjustable blade pressure per head	Accommodates RCN size variation within a grade without blade reconfiguration
1 HP (0.75 kW) 3-phase motor per unit	Consistent torque across all head counts — 2-head to 12-head — no power variability
Factory-direct supply, FOB Vietnam	USD 2,000–5,000 per unit — lower capex per KOR point gained vs. indirect-channel competitors
Binh Phuoc manufacture	Spare parts, service support, and direct factory access — no agent delays

A shelling machine loss reduction from 25 g/kg RCN to 15 g/kg RCN — a 10 g/kg improvement — translates to a KOR improvement of 0.8 points. On a daily throughput of 5,000 kg RCN, that is 40 kg of additional white kernel per day, every day. At USD 7–9 per kg export price, the machine pays for itself within weeks, not years.

Understanding Your Calculator Results

Week Average KOR

The week average KOR is the primary output and the figure to track week on week. It smooths out day-to-day variation in RCN quality and operator performance. A downward trend in week average KOR is an early warning signal — check Stage 2 shelling machine loss first, then Stage 4 grade-sort reject, as these are the two most variable and controllable stages.

White Kernel Yield Percentage

Yield percentage is the same metric as KOR expressed differently: Yield % = KOR ÷ 80 × 100, or equivalently, Final Output grams ÷ 10. A KOR of 22 equals a yield of 27.5%. Both figures are used — KOR is the commercial term; yield percentage is common in internal production reports and efficiency benchmarks.

Stage-by-Stage Mass Flow (Section B of Results)

This is the most operationally valuable output from the calculator. Each stage is shown as a chain: RCN Input → After Steaming → Raw Kernel with Testa → Dried Kernel → White Kernel (Peeled) → Final Output. If your KOR is below benchmark, examine where the largest drop occurs relative to your typical values. A large drop between Raw Kernel with Testa and Dried Kernel indicates Stage 3 over-drying. A large drop at Stage 4 Peeling indicates a Stage 2 or Stage 3 upstream quality issue.

Mass Balance Verification

The mass balance check confirms that your input measurements are internally consistent. If the mass balance deviates more than ±5 g from 1,000 g/kg RCN, at least one measurement is incorrect. Common causes: re-weighing after steam loss (not before), misidentifying CNSL weight as shelling loss, or recording batch weights in different units across stages. The calculator flags deviations and prompts you to recheck the specific day’s inputs.

Weekly Production Totals (Section C of Results)

Section C converts the per-kg-RCN ratios into actual factory output for the week using your entered batch weights. White Kernel Produced, Shell Recovered, CNSL Recovered, and Testa Recovered are all shown in kilograms. These figures feed directly into your weekly production report, inventory reconciliation, and by-product revenue accounting.

Frequently Asked Questions — Cashew KOR Calculator

Get a Cutting Machine Built to Raise Your KOR

OUTTURN cashew cutting machines are manufactured in Binh Phuoc Province, Vietnam — the largest cashew processing region in the world — and are sold factory-direct at FOB Vietnam prices from USD 2,000 to USD 5,000 per unit. Machine models range from 2-head to 12-head configurations, all using 1 HP (0.75 kW) 3-phase power regardless of head count.

If your Stage 2 shelling machine loss figure from this calculator is above 20 g/kg RCN, or if your week-average KOR is more than 1.5 points below the industry benchmark for your RCN grade, speak with the OUTTURN team directly. Bring your KOR Tracker results to the conversation — the data tells the story.