People cooking one portion
A 227g tin can match a single tomato-based meal without requiring a plan for the remainder. Sainsbury's labels its 227g chopped tomatoes as one serving; check whether that amount suits your recipe.
Who each tin size suits
People cooking two portions
A 400g tin suits a recipe divided between two meals or diners. ASDA suggests two servings for its 400g chopped tomatoes. If you save some, follow that tin's instructions for storing it after opening.
People comparing food labels
Tomatoes are one ingredient in the finished meal. The NHS advises checking nutrition per 100g as well as any stated portion, which may differ from the amount you eat.
What to check before buying
Decide how much tomato your recipe needs, then compare labels on the same per-100g basis before planning what to do with any remainder.
| Priority | What to check | Your needs |
|---|---|---|
| Portion and energy | Check the tin size, stated servings and energy per 100g. Work out the energy for the amount going into your meal rather than assuming the suggested serving matches yours. The NHS notes that stated portions can differ from what people eat. | I'm cooking one meal and want to know whether I'll use the whole tin. Sainsbury's labels its 227g tin as one serving at 55 kcal; ASDA suggests two servings for its 400g tin, at 44 kcal per half can. |
| Salt and ingredients | Compare salt per 100g on the tins you are considering, and read the ingredients if choosing a flavoured version. ASDA's plain chopped tomatoes list 0.03g salt per suggested half can; the ASDA herb version lists sugar and flavourings among its ingredients. | If I'm changing from plain to flavoured tomatoes, I want to compare the actual labels rather than assume the ingredients are the same. |
| Leftovers | Read the after-opening instructions on the chosen tin, including how to store unused contents and when to use them. Sainsbury's specifies use within 2 days after transfer and refrigeration; ASDA specifies 4 days for its plain chopped tomatoes. | Will I use the remainder in time? A smaller tin may fit a one-portion recipe, while a 400g tin calls for a plan if I'm using only part of it. |
Portion-planning mistakes to avoid
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Treating every tin as one serving
Using an entire 400g tin instead of a suggested half-can serving changes the amount of tomatoes and energy in your calculation. ASDA suggests two servings for its 400g chopped tomatoes, while Sainsbury's labels its 227g tin as one.
Decide how many portions the finished recipe makes, then use the label figures for the amount you will actually eat.
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Checking energy but not the rest of the label
Salt and ingredients differ between products. ASDA's herb chopped tomatoes, for example, list sugar and flavourings among their ingredients, unlike a simple assumption that every tin contains only tomatoes.
Compare salt per 100g and read the ingredients on the exact plain or flavoured tin you choose.
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Opening a larger tin without a second use in mind
After-opening instructions are product-specific. Sainsbury's says to refrigerate transferred contents and use them within 2 days; ASDA gives 4 days for its plain chopped tomatoes.
If your recipe uses only part of a 400g tin, transfer the remainder as its label directs and plan when you will use it.
Brand and retailer references
These examples show how pack size and label details can vary; check the particular tin you intend to buy.
Sainsbury's
Its 227g chopped-tomato tin is labelled as one serving.
- Sainsbury's lists 55 kcal and 0.16g salt per can.
- For a recipe needing more than 227g of tomatoes, check whether one tin supplies enough.
ASDA
Its plain 400g chopped-tomato tin is suggested as two servings.
- ASDA lists 44 kcal and 0.03g salt per suggested half-can serving.
- If using only half, transfer and refrigerate the remainder as directed and use it within 4 days.
Napolina
Napolina lists both 227g and 400g formats of its chopped tomatoes.
- Its product information lists 23 kcal per 100g and 47 kcal per half can.
- Choose the pack size against the quantity required by your recipe, rather than assuming a whole 400g tin is one portion.
Mutti
Mutti Polpa is a finely chopped 400g tomato option.
- The ASDA listing states 26 kcal and 0.30g salt per 100g.
- Its stated salt differs from the other examples here; compare current labels if salt matters to your choice.
M&S
M&S lists chopped Italian tomatoes in a 400g tin.
- Its product information states 25 kcal, 1.2g fibre and 0.02g salt per 100g.
- M&S instructs shoppers to transfer unused contents to a non-metallic container, refrigerate them and use them within 3 days.
Tesco
Tesco lists own-label chopped tomatoes in a 227g tin alongside 400g tomato products.
- The 227g listing offers another pack size to consider for a smaller recipe.
- Tesco advises reading the current product label because ingredients and nutrition information can change.
Joybuy tomato tins
These 400g single tins include chopped and whole-tomato formats for recipes where you can choose how much of the tin to use. If your recipe calls for chopped tomatoes, check the format before choosing a peeled or plum-tomato tin.
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Mutti Peeled Tomatoes 400g
A 400g tin to portion between meals if your recipe uses peeled tomatoes rather than chopped tomatoes. Check the current label for energy, salt, serving guidance and after-opening instructions.
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Laila Canned Plum Tomatoes 400g
A 400g plum-tomato tin for a recipe using whole tomatoes or portions of a tin. Read the current label for the energy figure and serving basis before using them in a portion calculation.
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KTC Chopped Tomatoes 400g
A 400g chopped-tomato tin for a recipe that calls for chopped tomatoes. If you will use only part of it, check the current label for serving guidance and instructions for storing the remainder.
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KTC Peeled Plum Tomatoes 400g
A 400g peeled plum-tomato tin for cooking with whole tomatoes rather than pre-chopped pieces. Compare its current per-100g label figures and check the after-opening instructions if planning a second use.
Questions about portions and labels
Is a 400g tin too much for one person?
Not necessarily: you can plan to use it across two meals or decide that your recipe needs the whole tin. ASDA suggests two servings for its 400g chopped tomatoes, so calculate the amount in the portion you will eat rather than treating the tin size as a rule.
Should I compare energy per tin, per portion or per 100g?
Use per 100g to compare different tins, then calculate the amount you will use. Per-can figures help if you use the whole tin; stated portions show the manufacturer's serving basis, which the NHS notes may differ from the amount you eat.
Do the tomatoes determine the energy in the finished meal?
No. The tomato label accounts for the tomatoes, while the energy in your serving also depends on the quantities of other ingredients you add and how many portions the recipe makes.
How should I plan for leftover tinned tomatoes?
Follow the instructions on the tin you open. For example, Sainsbury's directs you to transfer unused contents to a non-metallic container, refrigerate them and use them within 2 days; ASDA gives 4 days for its plain chopped tomatoes. Check the chosen product's label rather than applying one period to every tin.
What else should I check when switching to flavoured tomatoes?
Compare the ingredients and salt per 100g on the exact products. ASDA's chopped tomatoes with herbs list sugar and flavourings among their ingredients, so do not assume a flavoured tin has the same formulation as a plain one.