Swap Savings Calculator: what your everyday changes actually add up to
Realistic swaps, honest maths, no guilt.
Sustainable living advice usually arrives as a list of instructions with no numbers attached. That makes it impossible to prioritise: is a bamboo toothbrush worth the same effort as switching your laundry detergent? Almost never, but nothing in the usual advice tells you so.
The Swap Savings Calculator puts a figure on each change. Tick the swaps you would genuinely keep up, and it estimates annual plastic avoided, CO₂ avoided and money saved or spent — with every assumption visible so you can disagree with it.
Why some swaps matter far more than others
Impact is wildly uneven. Concentrated refills, a switch away from single-use bottled water, and reducing food waste routinely outweigh a dozen small cosmetic changes. Diet shifts outweigh nearly everything else in the household basket.
Seeing the numbers side by side tends to change behaviour more than any campaign: people drop the low-value rituals and keep the two or three that genuinely move the total.
Money is part of the calculation
Sustainable swaps are often framed as a premium you pay. Many are the opposite. Refill concentrates, safety razors, reusable bottles, bar soap and bulk staples all pay back their upfront cost within months, and the calculator shows the payback period rather than hiding it.
Where a swap genuinely costs more over a year, it says so. An honest tool has to be able to tell you that a change is not worth it.
How the estimates are built
Figures are modelled from published life-cycle assessment literature and public waste statistics, then deliberately rounded down. They are directional signals for prioritising decisions, not scientific claims about your specific household.
- Per-item plastic weights from packaging data rather than manufacturer marketing.
- Carbon factors drawn from peer-reviewed life-cycle studies.
- Conservative usage frequencies, so real-world savings are more likely to exceed the estimate than fall short.
Frequently asked questions
How accurate are the numbers?+
They are conservative estimates from published research, rounded down. Treat them as a way to rank swaps against each other, not as an audited footprint.
Do I need an account?+
No. Your selections stay in your browser and nothing is stored.
Which swap should I start with?+
Whichever combines a high estimated saving with a change you will still be doing in six months. Consistency beats ambition.
Keep reading
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Reviewed and maintained by the EthiCompare editorial team.