Vacuum Bag Space Savings Calculator
Proving the Space Savings, Not Just Assuming It
Vacuum storage bags are sold on a compression promise, but "up to 80% smaller" is a marketing figure, not a measurement of your actual bedding or clothing load. This calculator computes the real percentage from the before and after dimensions you measure yourself, so you know exactly how much closet, drawer, or moving-box space a compressed item will free up.
The Formula
Before and after volumes are each computed as length × width × height, so the calculator only needs the two sets of measurements — no separate volume calculation required beforehand.
Where This Calculation Matters
- Packing for a move — knowing the real compression ratio helps decide whether vacuum bags will actually free up enough truck or box space to be worth using.
- Seasonal storage — compressing off-season clothing or bedding to fit more into limited closet or attic space.
- Travel packing — compression bags for luggage benefit from knowing the real volume reduction before deciding what to pack.
- Comparing bag brands or techniques — measuring before/after volume with different bags or rolling versus folding methods gives an apples-to-apples comparison.
| State | Volume |
|---|---|
| Before (uncompressed) | 6,048 cu in |
| After (vacuum-sealed) | 1,728 cu in |
| Space saved | 4,320 cu in (71.43%) |
Computed directly from the formula above; compression results vary by fabric type and how tightly items are folded before sealing.
How to Use This Calculator
- Enter the length, width, and height of the item before compression.
- Enter the length, width, and height of the item after it's been vacuum-sealed.
- Select Calculate to get the percentage of space saved.
Related Calculations
Once space is freed up, check whether it changes your box count with the Moving Box Count Calculator, or see how much storage volume you have available with the Cubic Feet Calculator.