Sri Lanka Green Tea Leaf Price Calculator

Green tea leaf is a raw material: its value comes from the made tea a factory produces and sells at the Colombo auction. The Sri Lanka Tea Board's reasonable-price mechanism, framed under the Tea Control Act, splits that made-tea value between the smallholder who grew the leaf and the factory that manufactured it. This calculator applies that split directly.

The anchor is the factory's Net Sale Average (NSA) — its total monthly auction sale proceeds divided by the total kilograms of made tea sold that month, expressed in rupees per kg of made tea. The grower is entitled to a documented share of that value (the default here is 68%, with the remaining ~32% covering manufacture and selling costs). Because the NSA is priced per kg of made tea but leaf is bought per kg of leaf, the value is converted using the recovery ratio — the kilograms of green leaf needed to produce one kg of made tea (default 4.6).

The base reasonable price per kg of green leaf is therefore:

BasePrice = (NSA × SupplierShare) ÷ RecoveryRatio − Transport

Transport is the per-kg cost a grower incurs delivering leaf to a bought-leaf factory; it is deducted last. When a factory's NSA exceeds the district monthly average, the Tea Board mechanism shares that excess 50:50, adding an incremental bonus:

Bonus = max(0, FactoryNSA − DistrictNSA) × 0.5 ÷ RecoveryRatio

Every coefficient — supplier share, recovery ratio, transport — is an editable input with a sourced default, so nothing is hidden. As a credibility check the tool computes the base price two ways (share-first and value-chain-first); because the arithmetic commutes they must agree to the cent, and the "Cross-checked ✓" badge confirms it. The result is a benchmark, not a legally fixed rate: it tells a grower what the published formula implies for their factory's NSA, which is the number to compare against a monthly buying-price offer.

• Sri Lanka Tea Board — reasonable-price mechanism, NSA definition & revenue split (Tea Control Act)
• Tea Exporters Association of Sri Lanka — monthly Colombo auction averages / NSA reference
• Department of Census & Statistics — cost of production of tea per kilogramme (range context)

The formula, supplier share, and recovery ratio on this page were last cross-checked against the Sri Lanka Tea Board reasonable-price mechanism on 2026-07-15. Because factory NSA and Tea Board coefficients change, every value is an editable input — enter the figures from your factory's current circular for an exact result.