Office workers using a shared microwave
Look for a frozen portion with a clear calorie figure and instructions that fit the available microwave. Check its wattage, cooking time, stirring steps and standing time before taking the meal to work.
Who is choosing the lunch?
People who regularly buy ready meals
Compare the whole portion, not just the headline calorie figure. Salt, saturated fat, fibre, protein and the number of servings help distinguish meals you might otherwise treat as equivalent.
Canteen staff and shared-kitchen organisers
Check that frozen storage and the stated cooking method are practical for the kitchen. Use the current pack to check ingredients and allergens for the meal being served; a pan-cooked meal for two is a different proposition from an individual microwave lunch.
What should you check?
Start with the portion you intend to eat, then check whether the meal can be stored and cooked at work.
| Priority | What to check | Your needs |
|---|---|---|
| Portion calories | Read kcal per prepared serving and the number of servings in the pack. If you expect to eat the whole pack, compare its whole-pack total rather than kcal per 100g. | I want to know the calories in the amount I will actually eat, particularly when a pack contains more than one serving. |
| Other nutrition | Compare salt and saturated fat on the same portion basis; check fibre and protein where declared. Traffic-light labels can help compare fat, saturates, sugars and salt at a glance, as GOV.UK explains. | A lower calorie figure alone is not enough for my regular lunch choice; I also want to compare the rest of the nutrition label. |
| Preparation and storage | Confirm frozen-storage instructions and whether the meal can be microwaved from frozen. Match the stated wattage, cooking time, stirring and standing steps to the staff kitchen. | If lunch depends on a shared microwave, I need a meal whose full cooking instructions I can follow there. |
| Ingredients and allergens | Read the current pack’s ingredients, allergen statements and any precautionary warnings. Check the exact meal rather than assuming that similar recipes use the same ingredients. | When I am choosing food for someone with an allergen requirement, I need to check the pack being served. |
Mistakes to avoid
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Taking a calorie-controlled range name as the meal’s nutrition label
Tesco’s low-calorie ready-meal category and M&S’s Count On Us range can help narrow a search, but their range descriptions do not establish the calories, frozen status or cooking method of every individual meal.
Check the specific pack’s serving count, calories, nutrition panel, ingredients, allergens and preparation instructions.
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Choosing on calories alone
Action on Salt & Sugar’s May 2025 review of 1,511 UK chilled and frozen ready meals classified 56% of those assessed as high in salt, 42% as high in saturated fat and 71% as low in fibre. Those figures describe the products in its review, not every meal on sale.
When comparing meals, read salt, saturated fat and fibre alongside calories, using equivalent portion sizes.
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Confusing kcal per 100g with kcal per lunch
Waitrose lists its frozen chicken and king prawn paella as two servings, with 470 kcal and 2.44g salt per half-pack. Eating a different amount changes the total for that lunch.
Check the serving count and compare the amount you plan to eat, not just the per-100g column.
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Overlooking the kitchen setup
Cooking methods differ: Iceland’s Slimming World paella has microwave-from-frozen instructions for an 800W appliance, while the Waitrose meal-for-two paella is pan-cooked from frozen.
Check storage space, equipment, timings and the current pack label before adding a meal to a workplace lunch plan.
Retailer ranges to consider
A retailer range can provide starting points, but choose by the details of an individual frozen meal rather than by its range name.
Tesco
Tesco’s low-calorie ready-meal category lists several Tesco Calorie Controlled dishes.
- The category provides named meals and pack sizes to investigate.
- The cited category is under fresh ready meals; check whether a particular product is frozen and read its own nutrition and cooking information.
M&S
M&S describes its Count On Us dishes as calorie controlled and includes different ready-meal formats.
- The collection offers a way to identify individual meals for comparison.
- Check each product’s frozen status, portion nutrition, allergens and microwave instructions before considering it for this lunch.
Waitrose
Waitrose’s documented frozen-meal listings include individual Birds Eye bowls and a two-serving Waitrose paella.
- The Birds Eye listings give per-serving calories, protein, salt and microwave-from-frozen information.
- Both Birds Eye listings were marked unavailable when cited. The Waitrose paella serves two and is pan-cooked, so check both availability and preparation method for any meal you consider.
Sainsbury's
Sainsbury’s publishes per-pack nutrition for individual ready meals, including a documented chicken tikka masala with pilau rice.
- A whole-pack panel makes the portion basis clear for that product.
- The documented meal is chilled, not frozen; check frozen products individually rather than applying its figures to them.
Asda
An Asda product result names a Weight Watchers from Heinz frozen chicken tikka masala ready meal.
- The product name gives a specific frozen meal to investigate.
- Confirm the current product details and pack nutrition before treating it as a workplace-lunch option.
Iceland
Iceland’s Slimming World frozen range includes ready meals and lunch bowls.
- Its Slimming World paella page specifies microwave-from-frozen preparation: 10 minutes of cooking at 800W, with stirring and a standing step.
- The range name does not establish an individual meal’s calorie total. Iceland advises checking the actual label because ingredients, nutrition and allergy information can change.
Joybuy product options
This frozen dumpling option is relevant to a workplace lunch with microwave access. Check its portion and cooking instructions before deciding whether it fits the lunch you have in mind.
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Itsu Chicken Soup Dumplings 6Packs
Consider these frozen dumplings for a workplace lunch if you have access to a microwave. Check the current pack for the portion’s nutrition and allergens, the required microwave wattage and cooking time, and whether the portion meets what you want from lunch.
Common questions
What makes a frozen ready meal a lower-calorie lunch choice?
Compare the calories in the complete portion you intend to eat against comparable meals; a range name alone does not answer that question. Check the serving count, then read salt, saturated fat, fibre and protein alongside the calorie figure.
Can I compare frozen meals using calories per 100g?
Use the prepared serving or whole-pack figure for your lunch decision, because pack sizes and serving counts differ. Waitrose’s frozen chicken and king prawn paella, for example, contains two servings and lists 470 kcal per half-pack.
What should I check before using a workplace microwave?
Confirm that the specific meal can be microwaved from frozen and follow its stated wattage, timing, stirring and standing instructions. Do not apply one product’s cooking time to another; check that the available kitchen equipment lets you follow the pack’s method.
How should I check allergens for a canteen lunch?
Read the actual label on the exact prepacked meal being served, including its ingredients and allergen statements. Product information can change, so a previous purchase or an online description should not replace that check.
Does a frozen meal for two work as one workplace lunch?
It can work if the kitchen can prepare it by the stated method and portion the amount intended for each person. Waitrose’s frozen chicken and king prawn paella serves two and is pan-cooked from frozen, so it does not meet the same preparation need as an individual microwave meal.