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 boiled old potatoes?
130kcal
in a 175 g portion
74 kcal per 100 g.
Source: UK CoFID 2021, record 13-490, 22 analysed samples. Checked 5 October 2026.
0.18 gFat
3.2 gProtein
2.8 gFibre
33 %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.
- 0.18 gFat
- 3.2 gProtein
- 30.6 gCarbohydrate
- 2.8 gFibre
- 138 gWater
- 0.2 gMinerals and the rest
Below average for potatoes
Old potatoes are 74 kcal per 100 g. The 37 potatoes in this database average 179.
Old potatoes74
Potatoes average179
Low in sugar, almost no salt
Low sugars and very low salt by UK labelling rules, per 100 g.
Sugars, per portion1.4 g
Salt, per portion0.01 g
Vitamins and minerals in old potatoes
Two of the 20 reach the “source of” level, thiamin first; none reaches “high in”.
Only a trace
- Vitamin A
- Riboflavin
- Selenium
None recorded
- Vitamin D
- Vitamin B12
Show all 20 with amounts
Thiamin (vitamin B1)0.37 mg, 33 %
Potassium639 mg, 32 %
Vitamin C15.8 mg, 20 %
Chloride130 mg, 16 %
Folate0.0315 mg, 16 %
Pantothenic acid (vitamin B5)0.75 mg, 13 %
Copper0.11 mg, 11 %
Manganese0.21 mg, 11 %
Niacin (vitamin B3)1.6 mg, 9.8 %
Magnesium31.5 mg, 8.4 %
Phosphorus54.3 mg, 7.7 %
Vitamin B60.11 mg, 7.5 %
Iron0.6 mg, 4.3 %
Zinc0.35 mg, 3.5 %
Calcium10.5 mg, 1.3 %
Iodine0.00175 mg, 1.2 %
Biotin0.000525 mg, 1.1 %
Vitamin E0.02 mg, <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 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 potato chips (straight cut, frozen, fried in dripping).
0.2mg
0.2mg
0.2mg
0.1mg
0.1mg
Potatoes, old, boiled in unsalted water, flesh onlythis page
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 130 kcal. Per 100 g the figure is 74 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 boiling change the vitamin B6 in old potatoes?
Yes. Per 100 g, vitamin B6 goes from 0.14 mg raw to 0.06 mg boiled. 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 (365 mg, 18 %) and vitamin C (9 mg, 11 %) per 100 g.
How these numbers were made
Every figure comes from the UK Composition of Foods Integrated Dataset (CoFID), 2021 edition, record 13-490, Potatoes, old, boiled in unsalted water, flesh only, 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. Merged variant: boiled in salted water: 64 mg sodium, 74 kcal. 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.