Stop guessing at the shelf
Misleading pack sizes, confusing sheet counts, clever marketing — Smart Shopping Calculator cuts through it all. See the real unit cost in seconds: €/g, €/cm², €/cm³. Pick the best deal every time.
How it works
01
Toilet paper or protein powder. Each has methods tailored to what you can actually measure.
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Price, pack size, and one measurement — weight, sheet count, diameter, or even your hand.
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Instant unit cost for each product. Best value is highlighted. % gap shown for every other option.
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Enter how often you buy. See exactly how much you save per year by choosing the best option.
What makes it different
By weight, sheet count, diameter, or hand estimate. Works at home, in the store, without tools.
Cost per gram of actual protein — not per gram of powder. Compares up to 4 brands side-by-side.
Proportional bars make the gap obvious at a glance. No mental arithmetic required.
Point your camera at a protein powder barcode. Name, weight, and protein content fill in automatically via Open Food Facts.
Save your current comparison. Restore it next time. Clear it when you're done. All local, no account.
Full French and English interface. Supports €, $, £, CHF, ¥, C$ and A$. Preference saved automatically.
Supported categories
Compare up to 4 rolls by real paper content — not the marketing weight that includes the cardboard tube. Four methods so you can compare no matter what information is available.
The only metric that matters is cost per gram of actual protein. Enter price, servings per bag and protein per serving — the calculator does the rest. Works with any brand.
Free. No install. Works in your browser right now.