30 %
Thiamin contributes to normal energy-yielding metabolism, to the normal function of the heart and to normal psychological function.
How many calories are in old potatoes?
179kcal
in a 175 g portion
102 kcal per 100 g.
Source: UK CoFID 2021, record 13-553. Checked 5 October 2026.
6.8 gFat
3.3 gProtein
2.4 gFibre
30 %Daily thiamin
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.
- 6.8 gFat
- 3.3 gProtein
- 27.8 gCarbohydrate
- 2.4 gFibre
- 134 gWater
- 0.3 gMinerals and the rest
Below average for potatoes
Old potatoes are 102 kcal per 100 g. The 37 potatoes in this database average 179.
Old potatoes102
Potatoes average179
Low in sugar, almost no salt
Low sugars and very low salt by UK labelling rules, per 100 g.
Sugars, per portion1.8 g
Salt, per portion0.16 g
Vitamins and minerals in old potatoes
Two of the 22 reach the “source of” level, thiamin first; none reaches “high in”.
Only a trace
- Selenium
None recorded
- Vitamin D
Show all 22 with amounts
Thiamin (vitamin B1)0.33 mg, 30 %
Potassium590 mg, 29 %
Vitamin C14 mg, 18 %
Folate0.0297 mg, 15 %
Pantothenic acid (vitamin B5)0.75 mg, 13 %
Chloride98 mg, 12 %
Vitamin A0.0858 mg, 11 %
Manganese0.19 mg, 9.6 %
Phosphorus61.3 mg, 8.8 %
Copper0.09 mg, 8.8 %
Magnesium29.8 mg, 7.9 %
Niacin (vitamin B3)1.2 mg, 7.7 %
Vitamin B60.11 mg, 7.5 %
Vitamin B120.000175 mg, 7 %
Iodine0.007 mg, 4.7 %
Iron0.53 mg, 3.8 %
Zinc0.35 mg, 3.5 %
Calcium24.5 mg, 3.1 %
Riboflavin (vitamin B2)0.04 mg, 2.5 %
Biotin0.000875 mg, 1.8 %
Vitamin E0.16 mg, 1.3 %
Vitamin Dnone 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 2 % 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
2%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, old potatoes have the most thiamin of the 5 here, ahead of potatoes (new, frozen, `roast').
0.2mg
0.2mg
0.2mg
0.1mg
0.1mg
Potatoes, old, mashed with butterthis page
All values per 100 g, from the same dataset. Differences are against old potatoes.
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Questions about old potatoes
What the numbers say to the questions people actually search.
How many calories are in a portion of old potatoes?
A typical portion (175 g, a medium portion) gives 179 kcal. Per 100 g the figure is 102 kcal.
Is old potatoes a source of thiamin?
It is a source of thiamin: 0.19 mg per 100 g, 17 % of the NRV, which passes the 15 % threshold for “source of” but not the 30 % needed for “high in”.
Are these figures exact for old potatoes?
No. They are calculated from a standard recipe in the UK Composition of Foods Integrated Dataset (CoFID, 2021). A different recipe, portion of sauce or cooking method will move them, so read them as a typical estimate.
Which vitamins and minerals do old potatoes have most of?
By share of the daily reference intake: thiamin (0.19 mg, 17 %), potassium (337 mg, 17 %) and vitamin C (8 mg, 10 %) per 100 g.
How these numbers were made
Every figure comes from the UK Composition of Foods Integrated Dataset (CoFID), 2021 edition, record 13-553, Potatoes, old, mashed with butter, published by Public Health England under the Open Government Licence v3.0; this record is a calculated recipe estimate. Main data references: Updated 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 thiamin.
