Deliverable Volume Calculator

Check measured container volumes against USP <698> Deliverable Volume acceptance criteria for liquid dosage forms.

Deliverable volume testing checks that a liquid dosage form's container — an oral solution, suspension, or similar liquid product labeled to contain 250 mL or less — actually delivers the volume declared on its label, within the tolerances set out in USP General Chapter <698>. The requirement exists because a container that consistently under-delivers means patients receive less medication per dose than the label promises, even if the total fill volume looks correct on paper.

This calculator applies the exact USP <698> acceptance windows for two container types. Multiple-unit containers (multi-dose bottles) only need to clear a floor — no container may fall below 95% of labeled volume, with the batch average at or above 100%. Single-unit containers face a tighter, two-sided window of 95%–110%, since there's no opportunity to draw a second dose if the first one falls short.

Stage 1 testing checks 10 containers. If the result lands in a defined borderline zone — rather than passing outright or failing outright — USP <698> permits testing 20 additional containers and re-evaluating all 30 together under Stage 2's slightly wider tolerance for isolated borderline units.

Why this matters

Deliverable volume is one of the few finished-product tests that speaks directly to whether a patient gets their full dose, which is why searches around USP <698> deliverable volume and liquid dosage container fill testing tend to come from QC staff preparing a release test or investigating an OOS result on a multi-dose bottle. Because the Stage 1 → Stage 2 decision tree has several branching conditions — condition A (average short, no unit below the floor) versus condition B (average fine, one borderline unit) — getting the pass/proceed/fail call right by hand is a common source of manual error, especially under release-testing time pressure.

Formula used

• % of labeled volume = (Measured volume ÷ Labeled volume) × 100
• Multiple-unit: average ≥100%, and no container <95% (borderline retest zone: 90%–95%)
• Single-unit: average ≥100%, and each container within 95%–110% (borderline retest zone: 90%–95% or 110%–115%)

Common mistakes to avoid

• Applying the single-unit acceptance window (95%–110%) to a multi-dose bottle, which only has a floor requirement and no upper limit.
• Treating any borderline container as an automatic failure, when USP <698> explicitly allows retesting with 20 additional containers as long as no container falls below the extended retest range and no more than one is borderline.
• Averaging the 10 Stage 1 results with the 20 Stage 2 results separately instead of pooling all 30 together, which is what the standard actually requires.
• Forgetting that a container below 90% (multi-unit) or outside 90%–115% (single-unit) fails outright and is not eligible for retest, regardless of how the average looks.

Frequently asked questions

What is the difference between multiple-unit and single-unit deliverable volume limits?

Multiple-unit (multi-dose) containers only need each container at or above 95% of labeled volume, with no upper limit. Single-unit containers must fall within a tighter 95%–110% band on both sides.

What happens if Stage 1 deliverable volume testing fails?

If the failure is limited to an average shortfall with no container below the floor, or exactly one borderline container, USP <698> allows testing 20 more containers and evaluating all 30 together under Stage 2. Otherwise the result fails outright.

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