Wine Cellar Calculator

Bottles are stored in racks mounted against the walls, so the calculator's capacity model is really a rack-face-area problem: it computes total wall area from the room's perimeter times ceiling height, subtracts a fixed 21 sq ft for a standard door, and keeps 85% of the remainder as usable rack-mounting surface. Floor area and volume feed the cooling calculation instead, since heat load scales with the air the compressor has to condition, not with how much wall is covered in bottles.

The calculator applies 10 BTU per cubic foot for underground/basement cellars versus 20 BTU per cubic foot above ground because surrounding earth stays near a stable 55°F year-round and constantly wicks heat away from underground walls, cutting the compressor's work roughly in half compared to a room exposed to ambient indoor or outdoor temperature swings on most of its surfaces.

Racking type drives two separate multipliers in the calculation: it sets bottles-per-square-foot for capacity (3 for simple wood, 4 for individual bottle racks, 5 for custom built-ins, since built-ins nest bottle necks more tightly) and it sets the racking cost per bottle slot ($5, $12, and $25 respectively). So a denser racking style both increases how many bottles fit in the same wall area and increases the racking line item in your total build cost, since it's priced per bottle stored rather than per square foot of rack.

The calculator converts the cooling BTU load to watts, then assumes the compressor only actually runs about half of each day rather than continuously, since a well-insulated cellar cycles the unit on and off to hold temperature rather than running it nonstop. If your cellar has poor insulation, frequent door openings, or a hot ambient location, the real duty cycle — and therefore your actual electricity cost — could run meaningfully higher than this estimate.