Ketchup is one of the most widely used condiments, but its carb count surprises many people: a typical 100 g serving of regular ketchup contains about 22 g of carbohydrates, nearly all of it from added sugar and tomato sugars. That makes portion size surprisingly important for people tracking carbs, whether for low-carb diets, diabetes management, or general calorie awareness.
This calculator converts any ketchup serving into a standard carbs-per-100g number. Enter the amount you plan to eat, add the carbohydrate value from the nutrition label, and the tool does the unit conversions and math for you. It also estimates sugars, shows carbs per tablespoon, and offers quick-fill values for regular, reduced-sugar, sugar-free, and organic varieties.
Use it to compare brands, plan a burger or sandwich meal more accurately, or simply learn how a condiment you use daily fits into your macronutrient targets.
🍅 Ketchup Carbs per 100g Calculator
Turn any ketchup serving size into a standard carb count per 100 grams.
1. Serving size
Use the nutrition facts panel on your bottle for the most accurate result.
2. Label values for that serving
3. Typical ketchup quick-fill
How to Use This Calculator
Start by entering the amount of ketchup you plan to eat. The calculator accepts grams, tablespoons, teaspoons, and single-serve packets, and it automatically converts everything to grams using standard ketchup weights: 1 tablespoon ≈ 17 g, 1 teaspoon ≈ 5.7 g, and 1 packet ≈ 9 g. Next, enter the total carbohydrate grams shown on the nutrition label for that exact serving. If the label also displays sugars, fill in the optional sugars field so your result can include sugars per 100 g as well. The result card then shows the standardized carbohydrate density, along with grams per tablespoon and a short formula breakdown.
If you don’t have a label handy, use the typical-value quick-fill buttons. Select a ketchup type, and the calculator will estimate the carb and sugar content for your serving size based on average values in nutrient databases. Always treat these as estimates — actual values vary by brand, recipe, and region.
The Math Behind It
The core calculation is a simple proportion:
Carbs per 100 g = (total carbs in serving ÷ weight of serving in grams) × 100
For example, a 17 g tablespoon that contains 4 g of carbs has a density of (4 ÷ 17) × 100 = 23.5 g per 100 g. The same logic applies to sugars: sugars per 100 g = (sugars in serving ÷ serving weight) × 100. This normalization makes it easy to compare ketchup with other foods, because 100 g is the standard reference used on nutrition labels and in food composition databases.
The calculator also reports carbs per tablespoon because that is the portion most people actually use. To get that value, it divides the carbs in the entered serving by the number of tablespoons in that serving. For a 34 g serving (2 tablespoons) with 7.5 g carbs, carbs per tablespoon is 7.5 ÷ 2 = 3.75 g.
Worked Examples
Example 1 — Reading a label: Your bottle says 1 tbsp (17 g) has 4 g total carbs and 3.5 g sugars. Enter amount = 17 with unit grams, total carbs = 4, sugars = 3.5. The calculator returns 23.5 g carbs per 100 g and 20.6 g sugars per 100 g.
Example 2 — Restaurant packet: A single 9 g packet shows 2 g carbs on the brand’s website. Enter grams = 9, carbs = 2. Result: 22.2 g carbs per 100 g, or about 3.8 g per tablespoon.
Example 3 — Sugar-free option: You pour out 21 g (about 3.5 tsp) of a sugar-free ketchup that lists 0.6 g carbs for that amount. Result: 2.9 g carbs per 100 g. This type of estimate is useful for keto or diabetic meal planning, though always check the label.
Ketchup Carb Reference Table
| Ketchup type | Approx. carbs (g/100g) | Approx. sugars (g/100g) |
|---|---|---|
| Regular tomato ketchup | 22–24 | 19–21 |
| Reduced-sugar ketchup | 10–13 | 6–8 |
| Sugar-free / no added sugar | 2–5 | 1–3 |
| Organic / naturally sweetened | 14–17 | 11–14 |
| Homemade ketchup | 15–20 | 12–18 |
Values are averages compiled from USDA FoodData Central and common retail nutrition labels. Use them for planning, not for medical or professional diet prescriptions.
Common Mistakes to Avoid
- Mixing up serving weights. One tablespoon is not always 15 g for ketchup. Because ketchup is denser than water, a tablespoon weighs about 17 g. The calculator applies this conversion automatically, but if you are comparing with an online food database, check the exact weight it uses.
- Entering carbs per 100g into the serving field. The calculator asks for the carbs in the serving you actually entered, not the label’s per-100g value. Using the per-100g number directly will overstate the result by the ratio of your serving to 100g.
- Ignoring sugar alcohols. Some reduced-sugar ketchups use sugar alcohols or allulose, which may be counted as carbohydrates on the label even though they are not fully digested. If you track net carbs, check the ingredient list.
- Choosing the wrong quick-fill. “Organic” is not the same as “sugar-free.” Organic ketchup can still contain about 14–17 g carbs per 100 g because it is often sweetened with cane sugar or fruit juice.
Frequently Asked Questions
Is ketchup high in carbs? By weight, yes: regular ketchup typically contains 22 g carbs per 100 g, comparable to many breads and breakfast cereals. However, most people use only 10–30 g at a time, so a typical serving adds roughly 2–7 g of carbs. For context, a burger with a 34 g serving of ketchup adds about 7.5 g carbs before you count the bun; you can compare that with the burger carbs per 100g calculator.
Does ketchup have fiber? Very little. A 100 g portion contains around 0.3–0.5 g of fiber, so the total carb figure is essentially the same as net carbs.
What is the carb difference between ketchup and mayonnaise? Mayonnaise is almost entirely fat and has only trace carbs, while regular ketchup has about 22 g carbs per 100 g. Use the mayonnaise carbs per 100g calculator if you want an exact side-by-side comparison for your portion.
Can I use this calculator for other sauces? The math works for any sauce or spread, but the tablespoon-to-gram conversion factor would need to change because density varies. For ketchup, 1 tbsp ≈ 17 g; for a thinner sauce, it may be closer to 15–16 g.
Where can I find official nutrition data? The USDA FoodData Central database is a reliable public source for generic ketchup nutrition values. Brand-specific information is best taken directly from the manufacturer’s label or website.