What Is EAU (Estimated Annual Usage)? B2B Definition

[E] // Volume & Cost

EAU (Estimated Annual Usage)

EAU (Estimated Annual Usage) is your honest twelve-month volume forecast for a SKU, given to the manufacturer for pricing-tier setup.

Letter: E Category: Volume & Cost Abbrev: EAU Updated 2026-05-10

[01] // How it actually works

In practice.

EAU is the difference between a transactional quote and a relationship quote. A factory quoting against a single 5,000-unit PO will price for full margin recovery on a one-off run. The same factory quoting against a 60,000-unit EAU will tier the pricing — first run at one rate, subsequent quarterly runs at a lower rate — because they can pre-negotiate raw materials and reserve line time.

How to calculate honest EAU: take your forecasted monthly demand at month 6 post-launch (not month 1, when you have hype-driven launch numbers) and multiply by 12. Pad by 15% for upside. Do not pad by 100% to get better pricing — you will be asked to make purchase commitments against your EAU, and over-promising creates legal and relationship problems.

EAU also drives raw material commitments. Active ingredients with unstable supply chains (NMN, ergothioneine, certain peptides) require the factory to lock in supplier allocations. Without an EAU, your active goes on the spot market every quarter and your unit cost swings 30-60%.

Typical EAU brackets for tiered pricing: under 50k units (transactional), 50k-250k units (preferred partner), 250k-1M units (strategic account), 1M+ units (dedicated capacity).

[02] // Founders' trap

What founders get wrong about EAU (Estimated Annual Usage).

// Real-talk

Founders inflate EAU thinking it gets them better pricing. The factory has seen this trick a thousand times. They will quote the better price against the EAU, then quietly re-quote at higher rates on quarterly POs when the volume doesn't materialize. Inflated EAU damages the relationship more than honest EAU at a smaller number.

The other miss: not providing an EAU at all. A factory quoting blind treats every PO as a one-off and prices accordingly. Walk in with even a rough EAU and you'll see 10-20% better pricing on the first run.

[04] // Related guides

Read deeper on these.

[REF] // References

Authority sources cited on this entry.

FDA: Contract Manufacturing Arrangements for Drugs — Quality Agreements Guidance (FDA.gov)

/ Citations verified against the issuing body's published page. Last verified: 2026-05-10.

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