52 %
Potassium contributes to normal functioning of the nervous system and to normal muscle function.
How many calories are in roasted old potatoes?
282kcal
in a 175 g portion
161 kcal per 100 g.
Source: UK CoFID 2021, record 13-492. Checked 5 October 2026.
10 gFat
4.6 gProtein
4.7 gFibre
52 %Daily potassium
What’s in a 175 g portion
More than half of a portion is water, which is why the calories stay low. What is left is mostly carbohydrate.
- 10 gFat
- 4.6 gProtein
- 46.2 gCarbohydrate
- 4.7 gFibre
- 114 gWater
About average for potatoes
Old potatoes are 161 kcal per 100 g. The 37 potatoes in this database average 179.
Old potatoes161
Potatoes average179
Low in sugar, almost no salt
Low sugars and very low salt by UK labelling rules, per 100 g.
Sugars, per portion2.1 g
Salt, per portion0.01 g
Vitamins and minerals in old potatoes
Four of the 21 reach the “source of” level, potassium first; none reaches “high in”.
Only a trace
- Vitamin A
- Selenium
None recorded
- Vitamin D
- Vitamin B12
Show all 21 with amounts
Potassium1045 mg, 52 %
Vitamin E4.8 mg, 40 %
Thiamin (vitamin B1)0.39 mg, 35 %
Vitamin C22.8 mg, 28 %
Chloride196 mg, 25 %
Vitamin B60.25 mg, 18 %
Manganese0.33 mg, 17 %
Copper0.14 mg, 14 %
Pantothenic acid (vitamin B5)0.82 mg, 14 %
Magnesium49 mg, 13 %
Phosphorus80.5 mg, 12 %
Niacin (vitamin B3)1.6 mg, 9.8 %
Folate0.014 mg, 7 %
Zinc0.7 mg, 7 %
Iron0.77 mg, 5.5 %
Calcium15.8 mg, 2 %
Riboflavin (vitamin B2)0.02 mg, 1.3 %
Iodine0.00175 mg, 1.2 %
Biotin0.000525 mg, 1.1 %
Vitamin Dnone recorded
Vitamin B12none recorded
Badges use the UK legal thresholds per 100 g: 15 % of the reference intake for “source of”, 30 % for “high in”. A trace is shown as “trace” and never counts.
What old potatoes don’t give you. And where to find it.
No recorded vitamin D or selenium, and only 4 % of the zinc reference intake per 100 g.
Vitamin D
0mgin old potatoes
Find it inBloater, grilled500 % per 100 g
Selenium
Tracein old potatoes
Find it inKidney, pig, fried491 % per 100 g
Zinc
4%in old potatoes, per 100 g
Find it inOysters, raw592 % per 100 g
100 mgVitamin C, 125 %
0.075 mgSelenium, 136 %
0.00125 mgVitamin D, 25 %
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Old potatoes against other potatoes
Old potatoes come second for potassium here, just behind potato chips (fine cut, frozen, fried in blended vegetable oil).
720mg
597mg
516mg
423mg
360mg
300mg
Potatoes, old, roasted in sunflower oil, flesh onlythis page
Potato croquettes, fried−237 mg
All values per 100 g, from the same dataset. Differences are against old potatoes.
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Questions about old potatoes
Four questions chosen by the facts above, so every food answers differently.
How many calories are in a portion of old potatoes?
A typical portion (175 g, a medium portion) gives 282 kcal. Per 100 g the figure is 161 kcal.
Is old potatoes a source of potassium?
It is a source of potassium: 597 mg per 100 g, 30 % of the NRV, which passes the 15 % threshold for “source of” but not the 30 % needed for “high in”.
Does roasting change the fat in old potatoes?
Yes. Per 100 g, fat goes from 0.1 g raw to 5.7 g roasted. Part of that is the vitamin or mineral itself changing, part is the change in water content.
Which vitamins and minerals do old potatoes have most of?
By share of the daily reference intake: potassium (597 mg, 30 %), vitamin E (2.8 mg, 23 %) and thiamin (0.22 mg, 20 %) per 100 g.
How these numbers were made
Every figure comes from the UK Composition of Foods Integrated Dataset (CoFID), 2021 edition, record 13-492, Potatoes, old, roasted in sunflower oil, flesh only, published by Public Health England under the Open Government Licence v3.0. Main data references: DH, Nutrient analysis of fruit and vegetables, 2013. Values are per 100 g of the edible part; a portion is 175 g, a medium portion, the usual UK portion for potatoes. Reference intakes follow Regulation (EU) 1169/2011 Annex XIII as retained in GB law; “source of”, “high in” and “low” follow Regulation (EC) 1924/2006, assessed per 100 g. Function lines are the authorised wording from the GB register of nutrition and health claims, credited to the nutrient. Energy is rounded to the whole kcal and kJ; other amounts to one decimal, or two below 1. A trace is shown as “trace” and never gets a figure or a badge; a nutrient never analysed is left off the page. We start from the dataset’s 2,887 records and keep 2,322: records weighed with bone, shell or skin, alcoholic drinks, infant foods, brand-named products, records with fewer than eight measured vitamins and minerals and near-identical variants are left out. Group context uses the 37 potatoes kept from the dataset; a rank counts only the foods with a measured figure for that nutrient. Food images are illustrations from Ingredient Atlas, released under CC0; they show the food, not the measured sample, and where no illustration of the exact food exists the nearest one is shown (here: Potato). Checked 5 October 2026. Contains public sector information licensed under the Open Government Licence v3.0.
More potatoes
From the same group, with calories per 100 g, and the foods with the most potassium.
More potatoes
- Potatoes, old, mashed with reduced fat spread93 kcal
- Potato chips, fine cut, from fast food outlets290 kcal
- Potato chips, fried, from takeaway fish and chip shops214 kcal
- Potato chips, oven ready, with batter, baked202 kcal
- Potato powder, instant, made up with semi-skimmed milk67 kcal
- Potatoes, new and salad, boiled68 kcal
- All 37 potatoes