21 %
Phosphorus contributes to normal energy-yielding metabolism and to the maintenance of normal bones and teeth.
How many calories are in rock cakes?
232kcal
in a 60 g slice
386 kcal per 100 g.
Source: UK CoFID 2021, record 11-1109. Checked 5 October 2026.
8.9 gFat
3.2 gProtein
0.84 gFibre
21 %Daily phosphorus
What’s in a 60 g slice
More than half of a slice is carbohydrate, 19.2 g of it sugars and 17.9 g starch.
- 8.9 gFat
- 3.2 gProtein
- 37.1 gCarbohydrate
- 0.84 gFibre
- 9.7 gWater
- 0.4 gMinerals and the rest
About average for cakes, biscuits and pastries
Rock cakes are 386 kcal per 100 g. The 134 cakes, biscuits and pastries in this database average 394.
Rock cakes386
Cakes, biscuits and pastries average394
High in sugar
32 g of sugars per 100 g, which is red on a UK traffic-light label (the line is 22.5 g).
Sugars, per slice19.2 g
Salt, per slice0.57 g
Vitamins and minerals in rock cakes
Two of the 17 reach the “high in” level, led by phosphorus.
Only a trace
- Vitamin C
Show all 17 with amounts
Phosphorus145 mg, 21 %
Chloride164 mg, 20 %
Copper0.14 mg, 14 %
Manganese0.23 mg, 11 %
Vitamin B120.00018 mg, 7.2 %
Calcium55.2 mg, 6.9 %
Potassium136 mg, 6.8 %
Niacin (vitamin B3)1 mg, 6.4 %
Thiamin (vitamin B1)0.07 mg, 6 %
Iron0.68 mg, 4.9 %
Biotin0.00216 mg, 4.3 %
Vitamin B60.06 mg, 4.3 %
Riboflavin (vitamin B2)0.05 mg, 3.9 %
Zinc0.3 mg, 3 %
Magnesium10.2 mg, 2.7 %
Pantothenic acid (vitamin B5)0.16 mg, 2.7 %
Folate0.0036 mg, 1.8 %
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 rock cakes don’t give you. And where to find it.
No recorded vitamin C, and only 3 % of the folate reference intake and 4.5 % of the pantothenic acid reference intake per 100 g.
Vitamin C
Tracein rock cakes
Find it inCherries, West Indian2150 % per 100 g
Folate
3%in rock cakes, per 100 g
Find it inLiver, chicken, fried675 % per 100 g
Pantothenic acid (vitamin B5)
4.5%in rock cakes, per 100 g
Find it inLiver, calf, raw140 % per 100 g
100 mgVitamin C, 125 %
0.075 mgSelenium, 136 %
0.00125 mgVitamin D, 25 %
Or one scoop of Immufix
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Made in Cambridgeshire
Made in the UK since 1998, with every nutrient and its declared amount listed on the label.
Rock cakes against other cakes, biscuits and pastries
Rock cakes come second for phosphorus here, just behind cake (coconut).
251mg
241mg
223mg
150mg
86mg
78mg
All values per 100 g, from the same dataset. Differences are against rock cakes.
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Questions about rock cakes
The questions people ask about rock cakes, answered from the dataset.
How many calories are in a portion of rock cakes?
A typical portion (60 g, a slice) gives 232 kcal. Per 100 g the figure is 386 kcal.
Is rock cakes high in phosphorus?
Yes. Rock cakes, homemade have 241 mg phosphorus per 100 g, 34 % of the NRV, above the 30 % threshold for a “high in” claim.
Are these figures exact for rock cakes?
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 rock cakes have most of?
By share of the daily reference intake: phosphorus (241 mg, 34 %), chloride (273 mg, 34 %) and copper (0.23 mg, 23 %) per 100 g.
How these numbers were made
Every figure comes from the UK Composition of Foods Integrated Dataset (CoFID), 2021 edition, record 11-1109, Rock cakes, homemade, published by Public Health England under the Open Government Licence v3.0; this record is a calculated recipe estimate. Main data references: Updated 2014. Values are per 100 g of the edible part; a slice is 60 g, a slice, the usual UK portion for cakes, biscuits and pastries. 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 134 cakes, biscuits and pastries 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: Milk Snack Cakes). Checked 5 October 2026. Contains public sector information licensed under the Open Government Licence v3.0.
More cakes, biscuits and pastries
From the same group, with calories per 100 g, and the foods with the most phosphorus.
More cakes, biscuits and pastries
Most phosphorus
- Scones, wholemeal539 mg
- Scones, fruit, wholemeal494 mg
- Scones, cheese480 mg
- Bran, wheat1078 mg
- Wheatgerm1047 mg
- Cheese, processed, smoked1030 mg
- Phosphorus guide