Subway Nutrition CalculatorSubway nutrition data sources and versions
The current selectable comparison catalog is compiled from the linked US nutrition source. Country pages provide official regional guides and publication periods as verification links, but do not yet claim a complete local-menu transcription. Values should be checked against the restaurant's current regional guide.
A source version describes the document used during review, not a promise that every restaurant still serves every listed item. When a source is replaced, menu names, serving weights, and nutrient fields must be compared before the site date is updated. Promotional and store-specific items may remain outside the catalog.
How custom Subway nutrition totals are calculated
Each selected record contains serving weight, calories, fat, saturated fat, trans fat, cholesterol, sodium, carbohydrates, fibre, sugars, added sugars, and protein. The calculator multiplies each record by quantity and portion, then adds the same nutrient fields across the meal.
A preset sandwich is treated as one published record. A sandwich assembled from individual bread, protein, cheese, vegetable, sauce, and seasoning records is a separate reconstruction, so the two totals may differ when the official preset uses unrounded values or a recipe component not published independently.
How Footlong and sauce portion multipliers work
Footlong mode applies a factor of two only to sandwich components marked as size-dependent. Sauce portions use transparent comparison factors for less, regular, and extra. These factors are estimates when a regional guide does not publish all three portions.
Independent items such as salads, protein bowls, soups, cookies, and Sidekicks are not doubled when Footlong mode is active. Quantity still applies to those items. This prevents a sandwich-size control from silently changing unrelated parts of a complete meal.
How per-100g Subway nutrition is calculated
For supported country pages, each nutrient total is divided by the combined selected serving weight and multiplied by 100. Per-100g mode is unavailable until the meal has a positive published serving weight.
The per-100g view is useful for comparing foods with different serving sizes, but it is not the amount consumed unless the selected meal actually weighs 100 grams. Per-serving totals remain the clearer view for estimating the nutrition in the full order.
Subway Nutrition Facts rounding and daily values
Totals are retained as decimal values during calculation and rounded for display. Daily Value percentages use standard US label reference amounts as a comparison aid; country-specific labelling rules may use different terminology or reference intakes.
Because display rounding happens after addition, manually adding rounded numbers from a source table can be a few units above or below the calculator. The daily calorie target changes only the progress bar and remaining-calorie figure; it does not rescale the meal or provide a personalized intake recommendation.
Known limits of online Subway calorie estimates
The calculator cannot observe the portion assembled in a restaurant, supplier substitutions, cross-contact, preparation differences, discontinued items, or unpublished recipe changes. It should not be used as an allergen checker or personalized dietary plan.
Use the estimate to compare possible orders, then check the current official menu and allergen information for your market. See the accuracy disclaimerfor safety boundaries and the correction process when a source-backed value appears wrong.