How do you calculate cupping sample rate?

Divide cupped lots by total lots in scope and multiply by 100. With 36 of 48 lots cupped, that is 36 / 48 x 100 = 75%, meaning three of every four lots were sensory-reviewed before shipping.

What is a good cupping sample rate?

For specialty roasters, 100% of new green lot intakes and production batches is the gold standard. Established blends may be sampled at a lower rate, but anything under roughly 75% on production lots leaves real exposure to defects reaching customers.

What does the gap to target tell me?

It is the difference between your target and your actual rate. At a 75% rate against a 75% target the gap is 0 points, meaning you are exactly meeting plan; a positive gap means you are sampling fewer lots than your QC standard requires.

Should I cup every lot or sample a subset?

Cup 100% of green intakes and first production runs of each origin, since that is where variability lives. For repeat blends from a qualified supplier, a representative subset can be defensible as long as it stays at or above your target rate.

Why is my cupping rate falling during harvest season?

Volume usually outpaces lab capacity when fresh crop arrives. If lots roasted jump but cupping headcount does not, the denominator grows faster than the numerator and the rate slips below target even though you are cupping more in absolute terms.

Does cupping sample rate prove my coffee is good?

No. It only proves how much was tasted, not how it scored. Pair this coverage rate with average cupping scores and defect rates to judge actual cup quality alongside sampling diligence.

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Cupping Sample Rate Calculator

Cupping sample rate is the percentage of your coffee or tea lots that pass through a formal sensory evaluation before they ship, the quality-control coverage figure behind your cup quality promise. Every roaster claims consistency, but the only proof is how many lots were actually cupped versus how many went out untasted. Q-graders, QC leads, and green buyers track this rate to make sure sampling keeps pace with production volume, especially when new origins or seasonal crops introduce variability. Falling behind your target rate means defects, baggy or fermented notes, and roast inconsistencies can slip to customers before anyone tastes them, which is why the gap-to-target reading matters as much as the rate itself.

What this calculator does

Calculate cupping sample rate from cupped lots or batches, total lots or batches, and target sampling rate.
monitoring cupping, tasting, or sensory sampling coverage
It divides cupped lots by total lots in scope and multiplies by 100 to give your sensory coverage rate, then compares it against your target to show the gap.

Formula used

Cupping Sample Rate = cupped or sensory-reviewed lots ÷ total lots or batches in scope × 100
Gap to target = target cupping sample rate - cupping sample rate

Inputs explained

Lots cupped or sensory-reviewed:
Total lots or batches in scope:
Target cupping sample rate:

How to use the result

Use it at the end of a production week or per origin to confirm your cupping cadence is keeping up with how many lots you are roasting and shipping.
It measures coverage, not cup quality; a 100% rate proves you tasted everything but says nothing about scores, and counting a quick triangulation the same as a full SCA cupping protocol can flatter the number.

Common questions

How do you calculate cupping sample rate? Divide cupped lots by total lots in scope and multiply by 100. With 36 of 48 lots cupped, that is 36 / 48 x 100 = 75%, meaning three of every four lots were sensory-reviewed before shipping.
What is a good cupping sample rate? For specialty roasters, 100% of new green lot intakes and production batches is the gold standard. Established blends may be sampled at a lower rate, but anything under roughly 75% on production lots leaves real exposure to defects reaching customers.
What does the gap to target tell me? It is the difference between your target and your actual rate. At a 75% rate against a 75% target the gap is 0 points, meaning you are exactly meeting plan; a positive gap means you are sampling fewer lots than your QC standard requires.
Should I cup every lot or sample a subset? Cup 100% of green intakes and first production runs of each origin, since that is where variability lives. For repeat blends from a qualified supplier, a representative subset can be defensible as long as it stays at or above your target rate.
Why is my cupping rate falling during harvest season? Volume usually outpaces lab capacity when fresh crop arrives. If lots roasted jump but cupping headcount does not, the denominator grows faster than the numerator and the rate slips below target even though you are cupping more in absolute terms.

Last reviewed 2026-05-12.