53 %
Potassium contributes to normal functioning of the nervous system and to normal muscle function.
How many calories are in baked old potatoes?
170kcal
in a 175 g portion
97 kcal per 100 g.
Source: UK CoFID 2021, record 13-491, 22 analysed samples. Checked 5 October 2026.
0.35 gFat
4.4 gProtein
4.6 gFibre
53 %Daily potassium
What’s in a 175 g portion
More than half of a portion is water. The rest is 39.6 g carbohydrate and 4.6 g fibre.
- 0.35 gFat
- 4.4 gProtein
- 39.6 gCarbohydrate
- 4.6 gFibre
- 124 gWater
- 1.9 gMinerals and the rest
Below average for potatoes
Old potatoes are 97 kcal per 100 g. The 37 potatoes in this database average 179.
Old potatoes97
Potatoes average179
Low in sugar, almost no salt
Low sugars and very low salt by UK labelling rules, per 100 g.
Sugars, per portion2.4 g
Salt, per portion0.01 g
Vitamins and minerals in old potatoes
One of the 22 recorded reach the “high in” level. Potassium leads.
Only a trace
- Vitamin A
- Selenium
None recorded
- Vitamin D
- Vitamin B12
Show all 22 with amounts
Potassium1050 mg, 53 %
Thiamin (vitamin B1)0.35 mg, 32 %
Chloride200 mg, 25 %
Folate0.0315 mg, 16 %
Copper0.16 mg, 16 %
Manganese0.32 mg, 16 %
Niacin (vitamin B3)2.3 mg, 14 %
Vitamin B60.19 mg, 14 %
Pantothenic acid (vitamin B5)0.81 mg, 13 %
Vitamin C10.5 mg, 13 %
Magnesium47.3 mg, 13 %
Phosphorus78.8 mg, 11 %
Iron1.1 mg, 7.9 %
Zinc0.7 mg, 7 %
Riboflavin (vitamin B2)0.04 mg, 2.5 %
Calcium19.3 mg, 2.4 %
Vitamin K0.00164 mg, 2.2 %
Iodine0.00175 mg, 1.2 %
Biotin0.000525 mg, 1.1 %
Vitamin E0.09 mg, 0.7 %
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
Per 100 g, potato powder (instant, raw) have the most potassium in this comparison, followed by potato chips (fine cut, frozen, fried in dripping).
1430mg
720mg
630mg
600mg
320mg
Potato powder, instant, raw+830 mg
Potatoes, old, baked, flesh and skinthis page
Potatoes, new and salad, raw−280 mg
All values per 100 g, from the same dataset. Differences are against old potatoes.
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Questions about old potatoes
The questions people ask about old potatoes, answered from the dataset.
How many calories are in a portion of old potatoes?
A typical portion (175 g, a medium portion) gives 170 kcal. Per 100 g the figure is 97 kcal.
Is old potatoes high in potassium?
Yes. Potatoes, old, baked, flesh and skin have 600 mg potassium per 100 g, 30 % of the NRV, above the 30 % threshold for a “high in” claim.
Does baking change the riboflavin in old potatoes?
Yes. Per 100 g, riboflavin goes from 0.01 mg raw to 0.02 mg baked. 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 (600 mg, 30 %), thiamin (0.2 mg, 18 %) and chloride (114 mg, 14 %) per 100 g.
How these numbers were made
Every figure comes from the UK Composition of Foods Integrated Dataset (CoFID), 2021 edition, record 13-491, Potatoes, old, baked, flesh and skin, 22 analysed samples, 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
- Potato chips, thick cut, frozen, fried234 kcal
- Potato products, shaped, frozen, baked190 kcal
- Potato chips, fine cut, frozen, fried in blended vegetable oil364 kcal
- Potato chips, fried in dripping197 kcal
- Potato chips, straight cut, frozen, fried273 kcal
- Potato powder, instant, made up with water57 kcal
- All 37 potatoes