Compare Sugar in Two Products Calculator
Compare sugar fairly when serving sizes differ. See per serving, per 100g, teaspoons, calories, and label DV%.
Labels can be hard to compare because brands choose different serving sizes. This calculator normalizes both products so you can compare: sugar per serving (what you actually eat) and sugar per 100g (a fair baseline).
Use “Added Sugars” grams if the label provides it. Need help finding that row? See how to read the added sugar label. If you only have %DV, convert using %DV to grams.
Calculator
Product A
Product B
Load an example:
Result
To visualize a product’s sugar per serving as teaspoons, use grams to teaspoons. To estimate calories from sugar, use sugar calories calculator.
On this page
How to Use This Comparison Calculator
- Choose whether each label gives sugar per serving or per 100g.
- Enter serving size (in grams) so the calculator can normalize results.
- Compare per serving (practical) and per 100g (fair baseline).
When available, use Added Sugars grams—not Total Sugars—if you’re comparing against daily guideline limits. If you’re unsure, see added sugar vs total sugar.
Quick Reference: Serving Size Multipliers (Per 100g → Per Serving)
When you have sugar listed per 100g, you can estimate sugar per serving with: grams per serving = (grams per 100g × serving size in g) ÷ 100.
| Common serving size | Multiplier vs 100g | If product is 20g sugar/100g | Teaspoons (÷ 4g) |
|---|---|---|---|
| 30g (small serving) | × 0.30 | 6g | 1.5 tsp |
| 40g (typical bar/cereal portion) | × 0.40 | 8g | 2 tsp |
| 125g (sauce portion example) | × 1.25 | 25g | 6.25 tsp |
| 170g (single yogurt cup) | × 1.70 | 34g | 8.5 tsp |
The “20g sugar per 100g” column is just an example to make the multipliers intuitive. Use your real label values for accurate comparisons.
Questions People Ask
Should I compare sugar per serving or per 100g?
Use both. Per serving reflects what you actually eat in one sitting. Per 100g removes serving-size differences and is better for a fair “concentration” comparison—especially when brands use very different serving sizes.
Why can a product look “lower sugar” per serving but higher per 100g?
The most common reason is serving size. A brand can choose a smaller serving size so the per-serving grams look lower, while the sugar concentration (per 100g) stays high. That’s why per 100g is useful for fairness.
Which number should I use on the label—Total Sugars or Added Sugars?
If the label provides Added Sugars, use that for comparing against guideline limits and %DV. Total sugars can include naturally occurring sugars (like lactose in milk). If you’re unsure, see added sugar vs total sugar.
How do I compare products when one lists sugar per 100g and the other per serving?
Use the dropdown on each side to match what you have. If one product only gives per 100g, enter per 100g and your serving size. The calculator converts everything into both per-serving and per-100g outputs so the comparison stays fair.
How do I convert Added Sugars %DV to grams before comparing?
Use the % Daily Value to grams calculator first. Enter the label’s %DV for Added Sugars, then use the grams result as your per-serving input here.
How do I convert grams to teaspoons for each product?
A common label conversion is 4g sugar ≈ 1 teaspoon. This calculator already shows teaspoons per serving, but you can also use the dedicated grams to teaspoons calculator for visuals and examples.
Does rounding on nutrition labels affect comparison?
Yes. Labels can round grams (and sometimes %DV), especially for small amounts. For close comparisons (e.g., 1–2g difference), treat the result as approximate and consider comparing per 100g and scanning ingredients too.
What if both products are “zero sugar” or “no added sugar”?
“No added sugar” doesn’t always mean low total sugar (e.g., naturally sweet foods). If the label has 0g added sugars, compare total sugars or compare per 100g to understand the full sugar content—depending on your goal.
Can I use this calculator to compare drinks?
You can, but drinks often use per 100ml labeling. For drink-specific inputs (per 100ml + bottle size), use the sugary drinks sugar calculator.
After choosing the lower-sugar option, how do I track my daily total?
Add your foods across the day in the added sugar intake calculator, and compare against your personal reference with the daily added sugar limit calculator.
Key Takeaways
- Per serving reflects what you actually eat; per 100g is the fairest comparison.
- If a brand uses a smaller serving size, per-serving sugar may look lower—per 100g reveals the real concentration.
- Prefer Added Sugars grams when comparing against guideline limits and label %DV (US labels).
- Teaspoons: grams ÷ 4. DV% (FDA): grams ÷ 50 × 100.
- Track your day using added sugar intake calculator after choosing the lower-sugar option.
Important Disclaimer (Read Before Using)
This calculator is educational and compares the label values you enter. It does not provide medical advice, diagnosis, or treatment. Labels may differ by country, rounding rules, and serving-size definitions. For personal nutrition guidance, consult a qualified professional. Read the full policy here: Full Disclaimer.