Is a soda maker cheaper than buying soda?
The answer depends heavily on what you replace. A soda maker is more likely to beat single bottles or cans than deeply discounted store-brand multipacks.
CO₂ yield and flavoring costs
Advertised cylinder yield can differ from actual use because stronger carbonation consumes more gas. Syrup, flavor drops, and replacement bottles should also be included.
Other factors to consider
Homemade soda can reduce package handling and storage, but it requires refills, cleaning, and preparation. The calculator evaluates cost rather than environmental impact or convenience.