8.7 %
Thiamin is below the 15 % “source of” level in onions, so no function line applies.
How many calories are in fried onions?
76kcal
in an 80 g portion
95 kcal per 100 g.
Source: UK CoFID 2021, record 13-593. Checked 5 October 2026.
4.2 gFat
0.96 gProtein
2.4 gFibre
8.7 %Daily thiamin
What’s in an 80 g portion
More than half of a portion is water, which is why the calories stay low. What is left is mostly carbohydrate.
- 4.2 gFat
- 0.96 gProtein
- 9 gCarbohydrate
- 2.4 gFibre
- 63.9 gWater
Above average for vegetables
Onions are 95 kcal per 100 g. The 240 vegetables in this database average 59.9.
Onions95
Vegetables average59.9
Protein and fibre in a portion
0.96 g of protein and 2.4 g of fibre, neither at a claim threshold.
Protein, per portion0.96 g
Fibre, per portion2.4 g
Vitamins and minerals in onions
None of the 22 reaches the “source of” level. Thiamin comes closest at 11 % per 100 g.
Only a trace
- Selenium
None recorded
- Vitamin D
- Vitamin B12
Show all 22 with amounts
Thiamin (vitamin B1)0.1 mg, 8.7 %
Vitamin B60.08 mg, 5.7 %
Manganese0.11 mg, 5.6 %
Potassium110 mg, 5.5 %
Chloride43.2 mg, 5.4 %
Niacin (vitamin B3)0.64 mg, 4 %
Copper0.03 mg, 3.2 %
Vitamin C2.4 mg, 3 %
Calcium24 mg, 3 %
Folate0.0056 mg, 2.8 %
Phosphorus18.4 mg, 2.6 %
Magnesium8.8 mg, 2.3 %
Vitamin E0.27 mg, 2.3 %
Biotin0.00088 mg, 1.8 %
Riboflavin (vitamin B2)0.02 mg, 1.7 %
Iron0.24 mg, 1.7 %
Zinc0.16 mg, 1.6 %
Iodine0.0016 mg, 1.1 %
Pantothenic acid (vitamin B5)0.03 mg, 0.5 %
Vitamin A0.0016 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 onions 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 onions
Find it inBloater, grilled500 % per 100 g
Selenium
Tracein onions
Find it inKidney, pig, fried491 % per 100 g
Zinc
2%in onions, per 100 g
Find it inOysters, raw592 % per 100 g
100 mgVitamin C, 125 %
0.075 mgSelenium, 136 %
0.00125 mgVitamin D, 25 %
Or one scoop of Immufix
Every 25 g scoop declares 100 mg of vitamin C, 0.00125 mg of vitamin D and 0.075 mg of selenium, alongside other vitamins and minerals. Vitamin C, vitamin D and selenium contribute to the normal function of the immune system.
30-day money-back on your first pouch. 75 kcal and 9.9 g of sugars a scoop.
Try your first pouch
30-day money-back guarantee on your first qualifying pouch, less £10 shipping and handling.
Tracked UK delivery
Free standard delivery to UK addresses. Royal Mail 48 tracked, usually 2 to 3 working days.
Made in Cambridgeshire
Made in the UK since 1998, with every nutrient and its declared amount listed on the label.
Onions against other vegetables
Per 100 g, cabbage (white, raw) have the most thiamin in this comparison, followed by mushrooms (Jew's ear, tender, dried, raw) and onions.
0.2mg
0.2mg
0.1mg
0.1mg
0.1mg
0.1mg
Cabbage, white, raw+0.1 mg
Onions, fried in lardthis page
Asparagus, grilled−0 mg
Carrots, old, boiled−0 mg
All values per 100 g, from the same dataset. Differences are against onions.
Since that first introduction in 1998, Immufix has remained a constant in my life.
Paula Radcliffe, ambassador and co-owner. Read her story
Taken every morning since 1998.
Paula Radcliffe has taken the same formula since she was 24. Customers rate Immufix 4.8 out of 5 from 89 reviews.
2:15:25World record, 2003
28Years, same routine
6London and New York wins
Review 1 of 3
Questions about onions
The questions people ask about onions, answered from the dataset.
How many calories are in a portion of onions?
A typical portion (80 g, one of your five a day) gives 76 kcal. Per 100 g the figure is 95 kcal.
Which vitamins and minerals do onions have most of?
By share of the daily reference intake: thiamin (0.12 mg, 11 %), vitamin B6 (0.1 mg, 7.1 %) and manganese (0.14 mg, 7 %) per 100 g.
Are onions high in fibre?
It is a source of fibre (3 g per 100 g, above the 3 g line) but not high in fibre, which needs 6 g.
Are onions high in salt?
No. Salt is 0.01 g per 100 g, which is very low under UK rules.
How these numbers were made
Every figure comes from the UK Composition of Foods Integrated Dataset (CoFID), 2021 edition, record 13-593, Onions, fried in lard, 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 80 g, one of your five a day, the usual UK portion for vegetables. 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 240 vegetables 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: Onion). Checked 5 October 2026. Contains public sector information licensed under the Open Government Licence v3.0.
More vegetables
From the same group, with calories per 100 g.
More vegetables
- Chicory, pale variety, raw11 kcal
- Kohl rabi, boiled18 kcal
- Onions, dried, raw309 kcal
- Peppers, capsicum, chilli, red, raw26 kcal
- Squash, butternut, baked39 kcal
- Vegetables, mixed, frozen, boiled42 kcal
- All 240 vegetables