Why Tracking Calories from Recipes Is So Hard (And How to Actually Do It)
If you've ever logged a home-cooked meal in MyFitnessPal and felt vaguely suspicious of the number, you were right to be suspicious. Recipe nutrition data is unreliable in ways most people don't realise — but the fixes are simpler than you'd expect.
The three reasons recipe calories are wrong
1. Raw vs. cooked weight
This is the biggest and most common error. Meat loses water when it cooks — a 200g raw chicken breast becomes roughly 140–160g cooked, but the calories stay the same. If a recipe says "200g chicken breast" and you weigh it after cooking, you're logging less food than you actually ate.
The rule of thumb: always log ingredients at whichever stage the recipe measures them. If the recipe says "200g raw chicken," weigh it raw. If it says "1 cooked chicken breast," weigh it cooked. Mixing the two is where most tracking errors happen.
2. Serving size is a guess
"Serves 4" is not a measurement. It's whoever wrote the recipe estimating what a reasonable portion looks like. Your actual serving could easily be 20–30% more or less — and that's before accounting for sauces reducing differently, pasta absorbing more liquid, or just dishing up generously.
The fix is to weigh your total batch, then weigh your serving. If the whole pot weighs 900g and you eat 250g, you ate 28% of the recipe. Log 28% of the total calories. It takes 30 seconds and is far more accurate than trusting even portions.
3. Oil is almost always miscounted
Recipes say "2 tablespoons of olive oil." Some of that stays in the pan after roasting. Some absorbs into the food when frying. Most tracking apps just divide the full oil quantity by the number of servings, regardless of what actually ended up in the dish.
For roasting, a reasonable estimate is that about half the oil stays in the pan. For pan frying, most absorbs. For salad dressings, track the full amount. None of this is exact, but it's closer than logging the full quantity every time.
Practical habits that actually help
Weigh ingredients before cooking, in grams. Raw weights are more consistent than cooked, and grams are more precise than cups. This one habit removes more error than anything else.
Make a custom recipe entry once, use it forever. Both MyFitnessPal and Cronometer let you save a recipe with your exact ingredients and serving size. The first time you make a dish, spend two minutes entering it properly. Every time after that, it's one tap.
Cook the same things regularly. A recipe you've made ten times and always portion the same way is far more trackable than a new dish every night. Variety is great for eating; consistency is great for tracking.
Use Cronometer over MyFitnessPal for home cooking. Cronometer's database is more carefully curated and its recipe tool is better suited to tracking full batches by weight. MyFitnessPal's database is larger but filled with user-submitted entries that are often wildly inaccurate.
Track trends, not individual meals. Even with careful tracking, home cooking is probably ±10–15% accurate on any given meal. Over a week, errors average out. If your weight is moving in the direction you want, your tracking is working — regardless of whether Tuesday's pasta was exactly 520 or 580 calories.
A worked example
Say you're making a chicken and vegetable stir-fry for two.
- Weigh everything raw before it hits the pan: 300g chicken breast, 200g broccoli, 1 tbsp sesame oil, 2 tbsp soy sauce, 150g rice (dry weight).
- Cook it. The whole batch weighs 750g when done.
- You dish up 380g. That's 51% of the batch.
- Log 51% of each ingredient's calories.
That's it. Takes an extra minute the first time, thirty seconds once you know your portion size.
The honest baseline
Even done well, calorie tracking from home cooking is an approximation. The goal isn't perfect numbers — it's consistent numbers. If you weigh ingredients, track your actual portion, and do it the same way every time, you'll have data that's useful for spotting patterns and making adjustments. That's all tracking needs to be.