33 %
Thiamin contributes to normal energy-yielding metabolism, to the normal function of the heart and to normal psychological function.
How many calories are in baked old potatoes?
135kcal
in a 175 g portion
77 kcal per 100 g.
Source: UK CoFID 2021, record 13-620. Checked 5 October 2026.
0.18 gFat
3.9 gProtein
2.4 gFibre
33 %Daily thiamin
What’s in a 175 g portion
More than half of a portion is water. The rest is 31.5 g carbohydrate and 3.9 g protein.
- 0.18 gFat
- 3.9 gProtein
- 31.5 gCarbohydrate
- 2.4 gFibre
- 138 gWater
Below average for potatoes
Old potatoes are 77 kcal per 100 g. The 37 potatoes in this database average 179.
Old potatoes77
Potatoes average179
Low in sugar, almost no salt
Low sugars and very low salt by UK labelling rules, per 100 g.
Sugars, per portion1.2 g
Salt, per portion0.01 g
Vitamins and minerals in old potatoes
Nothing reaches the “high in” level, but two of the 24 count as a source, led by thiamin.
None recorded
- Vitamin A
- Vitamin D
- Vitamin B12
Show all 24 with amounts
Thiamin (vitamin B1)0.37 mg, 33 %
Potassium630 mg, 32 %
Chloride126 mg, 16 %
Copper0.14 mg, 14 %
Niacin (vitamin B3)1.9 mg, 12 %
Phosphorus70 mg, 10 %
Folate0.0175 mg, 8.8 %
Manganese0.18 mg, 8.8 %
Magnesium31.5 mg, 8.4 %
Pantothenic acid (vitamin B5)0.46 mg, 7.6 %
Vitamin B60.11 mg, 7.5 %
Vitamin C5.3 mg, 6.6 %
Zinc0.53 mg, 5.3 %
Iron0.7 mg, 5 %
Selenium0.00175 mg, 3.2 %
Vitamin K0.00164 mg, 2.2 %
Calcium12.3 mg, 1.5 %
Riboflavin (vitamin B2)0.02 mg, 1.3 %
Iodine0.00175 mg, 1.2 %
Biotin0.000525 mg, 1.1 %
Vitamin E0.11 mg, 0.9 %
Vitamin Anone recorded
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”.
What old potatoes don’t give you. And where to find it.
No recorded vitamin D, and only 1.8 % of the selenium reference intake and 3 % of the zinc reference intake per 100 g.
Vitamin D
0mgin old potatoes
Find it inBloater, grilled500 % per 100 g
Selenium
1.8%in old potatoes, per 100 g
Find it inKidney, pig, fried491 % per 100 g
Zinc
3%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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Made in Cambridgeshire
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Old potatoes against other potatoes
Per 100 g, old potatoes have the most thiamin of the 5 here, ahead of potato products (shaped, frozen, baked).
0.2mg
0.2mg
0.2mg
0.1mg
0.1mg
Potatoes, old, baked, flesh onlythis page
Potato croquettes, fried−0.1 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 135 kcal. Per 100 g the figure is 77 kcal.
Is old potatoes a source of thiamin?
It is a source of thiamin: 0.21 mg per 100 g, 19 % of the NRV, which passes the 15 % threshold for “source of” but not the 30 % needed for “high in”.
Does baking change the vitamin C in old potatoes?
Yes. Per 100 g, vitamin C goes from 14 mg raw to 3 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: thiamin (0.21 mg, 19 %), potassium (360 mg, 18 %) and chloride (72 mg, 9 %) per 100 g.
How these numbers were made
Every figure comes from the UK Composition of Foods Integrated Dataset (CoFID), 2021 edition, record 13-620, Potatoes, old, baked, flesh only, published by Public Health England under the Open Government Licence v3.0. Main data references: As Vegetables, Herbs and Spices Supplement (1991) 13-011, Vitamin K1 from Bolton-Smith et al Br.J. Nutr.83, 2000. 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 thiamin.
More potatoes
- Potato chips, oven ready, with batter, baked202 kcal
- Potato powder, instant, made up with semi-skimmed milk67 kcal
- Potatoes, old, wedges, with skin, cooked145 kcal
- Potato chips, fried in beef dripping, from takeaway fish and chip shops214 kcal
- Potato chips, microwave, cooked221 kcal
- Potato chips, thick cut, frozen, fried234 kcal
- All 37 potatoes