About the Chest vs Upright Freezer
This calculator compares the annual electricity cost of a chest freezer against an upright freezer of the same storage capacity, based on typical per-cubic-foot energy consumption differences between the two designs. It's useful for anyone shopping for a new freezer who wants to weigh the efficiency gap against the convenience tradeoffs of each style.
How It Works
You enter the freezer's capacity in cubic feet and your electricity rate. The calculator applies separate fixed annual energy-use rates per cubic foot for chest and upright models, multiplies each by your capacity and rate to get an annual cost for each style, and reports the difference as your potential savings from choosing a chest freezer.
Formula & Methodology
The calculator uses two fixed energy-intensity constants, 28 kWh per cubic foot per year for a chest freezer and 38 kWh per cubic foot per year for an upright, both scaled linearly by the capacity you enter. Each is then multiplied by your electricity rate to produce a dollar cost, and the two costs are subtracted to show the annual dollar gap between the two designs at that same capacity.
Examples
Mid-size 15 cu ft freezer
At 15 cu ft and $0.16/kWh, the chest freezer uses 420 kWh/yr costing $67, while the upright uses 570 kWh/yr costing $91, for an annual savings of about $24 with the chest style.
Larger 21 cu ft freezer at a higher rate
At 21 cu ft and $0.22/kWh, the chest freezer uses 588 kWh/yr costing about $129, while the upright uses 798 kWh/yr costing about $176, for an annual savings of roughly $47 with the chest style.
Advantages
- Puts a concrete annual dollar figure on the efficiency gap between two common freezer designs
- Scales directly with your own electricity rate rather than assuming a national average
- Lets you test different capacities to see how the savings gap grows with a larger freezer
Common Mistakes
- Comparing freezers of different actual capacities while only entering one capacity figure, which misrepresents the real-world tradeoff between two differently sized units
- Assuming the fixed 28 and 38 kWh/cu ft/yr rates apply equally to older, non-ENERGY STAR models, when actual consumption can vary significantly by age and model
- Overlooking that the dollar savings shown are annual, not the freezer's full lifetime savings, when comparing against a price difference between two units at purchase
Edge Cases to Watch For
- Both freezer types are calculated using the same capacity figure, so the comparison only holds if you're actually choosing between two units of equal size, not comparing different-sized models
- The 28 and 38 kWh/cu ft/yr figures are fixed constants representing typical models and don't account for a specific unit's ENERGY STAR rating or age, which can shift real consumption well outside these averages
- There's no adjustment for door/lid opening frequency, so a freezer opened far more often than typical usage patterns would use more energy than either fixed rate reflects
Common Use Cases
- Shoppers deciding between a chest and upright freezer for a garage or basement
- Homeowners estimating long-term operating cost differences before a freezer purchase
- Anyone budgeting appliance electricity costs at their specific local electricity rate