How to Use a Food Scale: The Beginner's Guide to Accurate Tracking

A food scale is one of the most valuable purchases you'll make for a successful cut. Most people significantly underestimate how much they're eating when eyeballing portions — studies show estimates are typically 20–40% off. A scale removes this source of error completely.

Why Estimating Doesn't Work

Human perception of portion sizes is notoriously poor, particularly for calorie-dense foods. Some examples that surprise people:

• Peanut butter: A "tablespoon" eyeballed is typically 25–35g. An actual tablespoon is 16g. That's a 100kcal difference on a single spread.
• Oats: A visual "portion" varies from 50g to 90g+ depending on how you pour. That's 100–150kcal swing.
• Olive oil: A "drizzle" can be anywhere from 5g to 20g+ — a 100kcal difference.
• Nuts: A small handful varies from 20g to 50g — a 100–250kcal range.

Over a full day of eyeballing, most people undercount by 200–600kcal. That's potentially the entire deficit.

What Scale to Buy

You don't need anything expensive. A basic digital kitchen scale with 1g precision costs £8–15 and does everything you need. Features to look for:

• 1g precision (not 5g — the cheaper ones are often inaccurate at low weights)
• Tare function (lets you zero out the weight of a bowl and add ingredients)
• 5kg capacity (more than enough for any single food item)

Avoid scales that only measure to 5g increments — this isn't accurate enough for small portions of calorie-dense foods.

The Tare Function

This is the most useful feature on a food scale. The tare function zeros out the scale while something is on it. This means you can:

1. Place a bowl on the scale → press tare (zeroes to 0g)
2. Add your first ingredient (e.g. 150g chicken) → reads 150g
3. Press tare again (zeroes to 0g with chicken in bowl)
4. Add second ingredient (e.g. 80g rice) → reads 80g

You can build an entire meal in a single bowl or pan by taring between each ingredient.

Cooked vs. Raw: The Common Mistake

This trips up a lot of beginners. Food databases (in apps like MyFitnessPal) contain entries for both raw and cooked foods, and they have different calorie values per gram — because cooked foods have lost water weight.

Example: 100g raw chicken breast ≈ 110kcal. 100g cooked chicken breast ≈ 165kcal (because cooking removes water, concentrating the calories).

If you weigh cooked chicken but log it as raw, you'll significantly undercount. Either:

• Weigh raw and log as raw, OR
• Weigh cooked and log as cooked

Pick one approach and stick to it consistently. Most nutritionists recommend weighing raw for whole ingredients.

What to Weigh (and What's Not Worth It)

Always weigh:

• Protein sources (meat, fish, eggs if by gram)
• Carbohydrate sources (rice, pasta, oats, bread)
• High-calorie condiments (nut butters, oils, sauces)
• Cheese, nuts, seeds

Usually fine to measure by volume:

• Water
• Leafy vegetables (negligible calories)
• Tea, coffee (black, unsweetened)
• Fresh fruit if logged by the piece (e.g. "1 medium apple")

Can estimate:

• Whole fruits and vegetables that come in natural single-serve units
• Non-caloric seasonings and spices

Building the Habit

The first week of using a food scale feels effortful. By week 3, it takes about 30 seconds per meal. The habit builds quickly, and the accuracy it provides makes your tracking genuinely meaningful rather than a rough guess.

Keep your scale on the kitchen counter, not in a cupboard. Out of sight = out of habit.

Key Takeaways

• Eyeballing portions is typically 20–40% inaccurate — a scale removes this error entirely
• A basic digital scale with 1g precision costs £8–15 and is all you need
• Use the tare function to weigh multiple ingredients in a single bowl
• Weigh raw ingredients and log them as raw for consistency
• Keep the scale on the counter to make it a frictionless daily habit