How many calories are in a baked potato?

A large baked potato (around 250g) contains approximately 269 kcal without any toppings. Per 100g, a baked potato provides 107 kcal. The calorie count is almost entirely from carbohydrates (56.5g per large potato), with minimal fat (0.5g) and moderate protein (6.3g). Toppings add significantly: butter adds roughly 75 kcal per knob, grated cheddar adds around 120 kcal per 30g portion.

Are baked potatoes high GI?

Yes — baked potatoes have one of the highest glycaemic indices of any common food, estimated at 85-93. This is higher than white bread (GI ~75) and white rice (GI ~73). The baking process gelatinises the potato starch, making it very rapidly digestible. A single large baked potato can cause a blood sugar spike comparable to eating 14 teaspoons of sugar in terms of glucose response. To reduce the impact, pair with protein and fat, eat the skin, or try cooling and reheating (increases resistant starch).

Is a jacket potato healthy?

A plain jacket potato is NOVA 1 (unprocessed), low in fat, and a good source of potassium and vitamin C. In those respects it is healthy. However, from a blood sugar perspective it is problematic — the very high GI (85-93) means it causes a rapid glucose spike. Whether a jacket potato is 'healthy' depends on context: for someone managing blood sugar or diabetes, it is one of the worst common meal choices. For someone who is active and not glucose-sensitive, it is an affordable, filling, whole-food option.

Glucose: HighNOVA 1

Nutritional Information for Baked Potato

A baked potato is one of the most common meals in the UK — cheap, filling, and perceived as healthy. From a SpikeSaver perspective, however, baked potatoes are one of the highest-GI common foods, with a glycaemic index of 85-93 depending on variety. A single large baked potato delivers around 56.5g of carbohydrates, almost all of which converts rapidly to glucose. The NOVA score is 1 for a plain baked potato (just potato), but the toppings people add — butter, cheese, baked beans — change the overall picture significantly.

Nutrition per 100g

Nutrient	Per 100g	Per serving
Energy	107 kcal / 455 kJ	269 kcal
Protein	2.5g	6.3g
Carbohydrates	22.6g	56.5g
of which sugars	1.4g	—
Fat	0.2g	0.5g
of which saturated	0.1g	—
Fibre	2.6g	—
Salt	0.01g	—

Serving size: 1 large baked potato (~250g) · Source: Tesco product page, October 2025

Glucose impact

Glycemic Index

High

Glucose risk

Baked potatoes have one of the highest glycaemic indices of any common food — estimated at 85-93 depending on variety. The baking process breaks down the potato starch into a form that is very rapidly digested and converted to glucose. A single large baked potato delivers 56.5g of carbohydrates, causing a substantial blood sugar spike. Eating the skin (which contains most of the fibre) helps slightly, but the GI remains firmly in the 'high' category. Adding protein (cheese, tuna, beans) or fat (butter) can help blunt the spike.

Processing level

NOVA 1 (unprocessed)

A plain baked potato is NOVA 1 — an unprocessed single-ingredient food. You are simply baking a whole potato with no additives. Tesco sells baking potatoes loose and in packs with no ingredient list beyond 'potato'. However, prepared potato products like Tesco Baked Potatoes with Cheddar (NOVA 3) or Tesco Finest Potato Dauphinoise (NOVA 3) contain added cream, cheese, butter, and salt that increase the processing level.

Baked Potato at Tesco

Source: Tesco product page, October 2025

Tesco Large Baking Potatoes Loose

£0.24*NOVA 1 (unprocessed)

Tesco Baking Potatoes 4 Pack

£0.79*NOVA 1 (unprocessed)

Tesco Finest Jacket Potatoes 4 Pack

£1.60*NOVA 1 (unprocessed)

Tesco 2 Baked Potatoes With Cheddar 450G

2 UPF markers

NOVA 3 (processed)

Tesco Finest Golden-Baked Potato Dauphinoise 400g

3 UPF markers

£3.25*NOVA 3 (processed)

*Prices were correct at the time of collection and may have since changed. Check Tesco.com for current pricing.

What to watch for when shopping

Plain baked potatoes are NOVA 1 but have an extremely high GI (85-93) — higher than white bread. This makes them one of the biggest glucose-spiking common foods. A large baked potato delivers 56.5g of carbs, which is more than two slices of white bread. To manage the spike: eat the skin (adds fibre), add protein-rich toppings (tuna, cheese, beans), and avoid eating a jacket potato as a standalone meal. Cooling a baked potato and reheating it increases resistant starch, which can modestly lower the GI. Budget tip: Tesco Large Baking Potatoes Loose at £0.24 each is exceptional value.

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