Turnips are a low-calorie root vegetable with a mildly sweet, peppery flavour, and their natural sugar content is modest compared with carrots or beets. Raw turnip contains about 3.8 g of sugar per 100 g; boiled turnip is slightly lower at around 2.5 g per 100 g. This calculator converts any serving size — grams, ounces, or cups of raw cubes — into its exact sugar content, so you can budget the natural sugars in your meals without guesswork.
This tool is useful for people tracking daily sugar intake, following low-sugar eating plans, or just curious about how much carbohydrate in their vegetables comes from sugar. It also converts your result into teaspoons and shows what share it represents of the common 30 g daily free-sugar guideline used by the NHS, while keeping in mind that sugars naturally present in whole vegetables are not the same as added sugars.
Enter a serving amount, choose a preparation method, and click Calculate to see a clear breakdown of sugar, portion weight, and the underlying per-100 g figure.
🥬 Turnip Sugar Calculator
Estimate the natural sugar in any serving of turnip — raw or boiled.
Calculation breakdown
Step-by-Step Guide
Start by entering the amount of turnip you want to check. The calculator accepts grams, ounces, or cups of raw cubed turnip. If you measure in cups, remember that a cup of raw turnip cubes is not the same as a cup of boiled mash — boiling changes both water content and density. After choosing the amount, select whether your turnip is raw or boiled. Raw values are around 3.80 g of sugar per 100 g, while boiled turnip has about 2.50 g per 100 g because cooking water dilutes the vegetable and leaches some soluble sugars. Click Calculate to see the sugar content for your serving in grams, the equivalent in teaspoons, and how it compares with a 30 g daily free-sugar guideline. Use Reset if you want to clear the results and start over.
- Grams — best if you weigh your serving on a kitchen scale; this is the most accurate option.
- Ounces — handy for recipes and food labels that list portion sizes in ounces.
- Cups (raw cubes) — a quick volume-based estimate; the tool uses 130 g per cup of raw cubed turnip.
Tip: A medium turnip about 5 cm across weighs roughly 122 g after trimming, so the “1 medium turnip” preset is a useful whole-food shortcut.
How the Calculation Works
The sugar content of any food is usually reported as grams of sugar per 100 g of edible portion. This is a density value, not a count for one serving. To find the sugar in your portion, you multiply the weight of your serving by the per-100 g value and divide by 100.
Formula: sugar (g) = serving weight (g) × sugar per 100 g ÷ 100.
Example: For 150 g of raw turnip, the calculation is 150 × 3.80 ÷ 100 = 5.70 g of sugar. For 120 g of boiled turnip, it is 120 × 2.50 ÷ 100 = 3.00 g of sugar.
The sugar values used here are based on USDA FoodData Central averages. They include naturally occurring glucose, fructose, and sucrose in the vegetable; they do not include added sweeteners, because turnip is almost always eaten without added sugar in savoury dishes. For total carbohydrate planning, remember that starch and fibre also make up part of the carb count.
Reference Data: Sugar in Turnips and Other Root Vegetables
The table below lists typical sugar, total carbohydrate, and calorie values for turnip and a few common root vegetables. Serving sizes differ, but this gives a useful comparison when choosing lower-sugar vegetables.
| Vegetable (raw) | Sugar per 100 g | Total carbs per 100 g | Calories per 100 g |
|---|---|---|---|
| Turnip | 3.80 g | 6.43 g | 28 kcal |
| Turnip, boiled | 2.50 g | 5.06 g | 22 kcal |
| Carrot | 4.74 g | 9.58 g | 41 kcal |
| Beetroot | 6.76 g | 9.56 g | 43 kcal |
| Parsnip | 4.80 g | 17.99 g | 75 kcal |
| Sweet potato | 4.18 g | 20.12 g | 86 kcal |
| Potato | 0.82 g | 17.49 g | 77 kcal |
Values are approximate and drawn from USDA FoodData Central. Actual sugar content can vary by variety, season, and cooking method.
Worked Examples
Example 1: Half a cup of raw cubes. A standard half-cup serving of raw turnip cubes is about 65 g. Sugar = 65 × 3.80 ÷ 100 = 2.47 g. That is roughly 0.6 tsp.
Example 2: One medium raw turnip. At about 122 g, sugar = 122 × 3.80 ÷ 100 = 4.64 g, about 1.1 tsp.
Example 3: 200 g boiled turnip. Sugar = 200 × 2.50 ÷ 100 = 5.00 g. Boiled turnip has more water, so the same cooked weight contains less sugar than raw.
These examples show how small the sugar contribution is relative to a single teaspoon of granulated sugar, which contains about 4.2 g.
Common Mistakes & Precision Notes
- Using the same cup weight for cooked and raw turnip. Raw turnip cubes are about 130 g per cup, but boiled or mashed turnip can be heavier per cup because water is absorbed. If you measure cooked turnip, weigh it in grams for the best result.
- Assuming “sugar” means all carbohydrates. Sugar is a subset of carbs. A 150 g raw turnip serving has about 9.6 g total carbs but only 5.7 g sugar; the rest is starch and fibre. For low-carb plans, see the turnip net carb calculator.
- Treating turnip sugar like added sugar. The 30 g daily sugar guideline commonly quoted on NHS pages refers to free sugars, including added sugar and fruit juices. Sugars in whole vegetables are not considered free sugars, though they still contribute to total carbohydrate.
- Ignoring natural variation. Sugar levels in turnips vary with variety, growing conditions, harvest time, and storage length. The values are averages, not exact chemical measurements for your specific vegetable.
Note: This calculator is for educational nutrition planning and does not replace individual advice from a doctor or registered dietitian.
Frequently Asked Questions
How much sugar is in 100 g of raw turnip? Raw turnip contains about 3.80 g of sugar per 100 g. Boiled turnip contains about 2.50 g per 100 g because cooking dilutes the vegetable and lowers density.
Is turnip high in sugar? No. With only 3.8–4.6 g of sugar in a typical serving, turnip is among the lower-sugar root vegetables. Beets, parsnips, and carrots all provide more sugar per 100 g.
Do I need to count turnip sugar on a low-sugar diet? For daily free-sugar limits, the natural sugars in whole vegetables are usually not what those guidelines target. However, if you count total carbohydrates for diabetes management or keto, turnip sugar and carbs should be included.
Why do cooked and raw turnips differ? Boiling in water causes the peeled turnip to absorb water and lose some heat-sensitive and water-soluble nutrients. A gram of boiled turnip therefore contains a smaller proportion of sugar than a gram of raw turnip. Roasting without added water will have less of a dilution effect.
For full nutrient profiles, see USDA FoodData Central and the NHS guide to sugar in our diet. If you are tracking net carbohydrates as well, try the turnip net carb calculator for a more complete picture.