Capacity Truth

What "capacity" actually means on a refrigerator spec sheet

By Erin Rose · Updated

Every refrigerator and freezer certified by the DOE has two volume numbers: the advertised volume on the box and the retail listing, and the DOE-adjusted volume used to compute its certified efficiency rating. We publish both, side by side, for every model in our corpus — 11,167 refrigerators and freezers, median gap +20.9%.

What the DOE-adjusted number actually is. It is a test-procedure energy weighting, not a physical re-measurement of the box. DOE's certification formula (10 CFR Part 430, Subpart B, Appendix A1) weights different compartments differently when computing the energy rating — freezer space in particular counts more heavily than fresh-food space in the adjusted-volume calculation. A higher adjusted volume than advertised volume does not mean the manufacturer under-advertised the box, and a lower one doesn't mean they over-advertised it — it means the test procedure weights the space differently than a simple cubic-foot measurement would. We show you the number because nobody else surfaces it per model; we don't reframe it as a "gotcha."

Separately — and this is a different claim, made by someone else — Consumer Reports has physically measured refrigerator interiors and found advertised capacity can overstate usable space by up to ~30%, driven by shelving, bins and icemaker housing that AHAM's advertised-capacity standard doesn't deduct. That's a real, separately-sourced finding about physical usable space — we cite it as CR's claim and don't reproduce their measurements, because we haven't independently re-measured any unit ourselves. Our number (DOE-adjusted volume) and CR's number (physically measured usable space) are two different things measuring two different questions; don't conflate them.

Sortable table — every model with both numbers published

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Brand & model Category Advertised (cu ft) DOE test-basis (cu ft) Delta
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Showing up to 300 rows at a time, sorted by the active column — search narrows the full set. Full machine-readable feed: /capacity-truth.json.

Why capacity is measured this way

The DOE requires manufacturers to certify refrigerators and freezers under a standardized test procedure so efficiency ratings are comparable across brands. That procedure computes an "adjusted volume" as part of the energy-factor math — it was never designed to be a consumer-facing capacity number, which is why it's buried in certification filings instead of on the yellow EnergyGuide label. We extract it because it's the closest thing to an independent, model-specific volume figure that exists in public data today, and because seeing both numbers side by side is more honest than seeing only the marketing one.

Both volume figures are sourced from DOE certification (CCMS) and ENERGY STAR. See methodology for the full formula citation. No star ratings, no paid placement.