When a Footlong is exactly double the listed 6-inch row
The useful rule is narrower than “a Footlong is always double.” In this site’s validated Subway Canada snapshot, a Footlong calculation is available only when the exact nutrition record carries an explicit Footlong multiplier. When that option exists, the factor is 2. The calculator applies it to the complete row: calories, total fat, saturated fat, trans fat, cholesterol, sodium, carbohydrate, dietary fibre, sugars, protein, calcium daily value, and iron daily value all move together.
That distinction protects the source boundary. A product name, a photo, or the physical idea of a longer sandwich does not authorize a multiplier. The Subway Canada menu calorie directory shows which records have a source-backed serving relationship. If a card has no Footlong option, the site leaves it at the listed serving instead of borrowing a rule from another sandwich or component.
The ×2 result is transparent arithmetic, not a separately measured restaurant meal. It says that the published source defines one Footlong as two of that listed 6-inch amount for the record. It does not prove that every customized portion, substitution, or restaurant build will weigh exactly twice as much. Keep the published relationship and the prepared order as two different kinds of evidence.
Three worked Canadian examples from the dated snapshot
Chicken Rancher is a prepared sandwich row with a 285 g listed serving. The base row reports 540 calories, 1,150 mg sodium, and 36 g protein. Its explicit Footlong factor produces 1,080 calories, 2,300 mg sodium, and 72 g protein. Those Footlong figures are calculated from the stored factor rather than typed into the article as an unrelated second row.
Black Forest Ham provides a second prepared-item example. Its 227 g listed sandwich row has 420 calories, 1,060 mg sodium, and 19 g protein. Applying its documented Footlong relationship gives 840 calories, 2,120 mg sodium, and 38 g protein. The row is specifically the sandwich format; separate Black Forest Ham wrap and salad records should not be substituted into this size comparison.
Chipotle Southwest Sauce shows why components need careful labels. Its listed component portion is 14 g with 60 calories and 110 mg sodium. The source mapping supports Footlong at ×2, so the calculated component amount is 120 calories and 220 mg sodium. This does not establish which finished sandwiches include the sauce or how much a restaurant used in a particular order.
How to calculate a 6-inch and Footlong comparison
Use the calculator as a record-by-record comparison rather than a shortcut based on size words alone. Start by opening the Subway calorie calculator, searching for the exact Canadian row, and confirming its category, kind, listed grams, and calories. A prepared sandwich row and a component row can both display a Footlong option, but they answer different questions and should keep their labels in the summary.
Next, add the listed serving as the 6-inch reference. Return to the same card, choose Footlong only if the selector is present, and add that selection separately. The summary then makes the comparison visible without overwriting the base row. Check more than the calorie total: the complete nutrition table lets you verify the base sodium, carbohydrate, protein, fat, fibre, sugars, cholesterol, calcium, and iron fields before multiplication.
- Match the exact row and format; do not use a salad or wrap row as a sandwich substitute.
- Confirm that the card actually displays a Footlong option and its ×2 factor.
- Add the base and Footlong selections separately so both remain visible.
- Review all nutrition totals and quantities, then reset before starting a different comparison.
Why a customized Footlong can differ from the calculated row
The official relationship applies to the nutrition record, not to every change someone can request. Extra protein, a different sauce amount, added cheese, omitted ingredients, substitutions, and restaurant portioning can all move a prepared order away from the listed row. Combining component rows may help model a documented addition, but the component list is not a complete recipe engine and cannot prove exactly what was served.
Rounding also matters. Published nutrition values are already presented at source precision. Multiplying a displayed value by 2 preserves the published arithmetic, but it does not recover unrounded laboratory data. The result is best used as a clear planning reference: it shows the selected row, factor, and quantity so you can explain where a total came from.
Restaurant availability and preparation can vary, and this site does not know the details of an individual order. The nutrition disclaimer explains the limits around rounding, customization, availability, allergen information, and medical use. For current product and preparation questions, check the official Canadian information and ask the restaurant when appropriate.
Compare more than the calorie number
A Footlong comparison doubles the whole documented nutrition row, so the change is not limited to energy. In the Chicken Rancher example, protein moves from 36 g to 72 g while sodium moves from 1,150 mg to 2,300 mg. Black Forest Ham moves from 19 g to 38 g protein and from 1,060 mg to 2,120 mg sodium. These figures describe the same mathematical factor across different fields; they are not a recommendation to choose or avoid either serving.
Serving size and the rest of a meal provide necessary context. Someone comparing two listed rows may care about different fields, but this site cannot supply a personalized calorie target or decide what is suitable for a health condition. Use the table to keep units visible, and use qualified guidance for individual medical or dietary decisions.
Source date, independence, and allergen safety
The examples in this guide resolve from the repository’s validated Subway Canada nutrition snapshot. Its nutrition document is dated June 11, 2026. That date matters because formulations, menu names, serving descriptions, and official documents can change. The public official nutrition destination is Subway Canada Nutrition & Allergies.
A Footlong multiplier does not establish ingredient completeness or allergy safety. This implementation does not infer component allergen records into every prepared item, and missing information remains unknown. Review current official ingredient and allergen materials for those questions. This independent guide is not affiliated with or endorsed by Subway and is general nutrition information, not medical advice.