SETTINGS
Energy & Macros
Use Settings → Energy & Macros to define how Fuel Lens calculates your daily energy and macronutrient targets. This page documents the complete energy and macro calculation settings.
Energy target
Fuel Lens derives the daily energy target from BMR and Baseline Activity Level. Enter or review your basal metabolic rate, then choose the activity level that represents your usual non-exercise movement. Custom lets you provide an activity amount directly in kcal.
- Basal Metabolic Rate (BMR) is the estimated energy your body uses at complete rest, in kcal per day.
- Baseline Activity Level applies an activity multiplier to BMR and represents usual non-exercise movement.
- Calculated Energy Target is the resulting daily target used by the dashboard and percentage-based macro calculations.
The calculated target is used by the dashboard and by percentage-based macro calculations. On days with tracker activity, the target can be different from the baseline value shown in the settings because the recorded activity is used for that date. It is an estimate for analysis, not a medical prescription.
Baseline activity and tracker activity
The Baseline Activity Level represents usual non-exercise movement. Tracker activity represents recorded activity calories for a specific day, such as Garmin or Cronometer exercise data.
With the default Tracker activity can replace this baseline for that day setting enabled, Fuel Lens uses:
No tracker activity:
daily target = BMR + baseline activity + additional calories
Tracker activity present:
daily target = BMR + tracker activity + additional calories
This prevents the same activity from being counted twice. The setting is enabled by default and can be disabled when baseline and tracker activity should be added together.
For example, in a case where BMR is 1870 kcal and tracker activity is 1265 kcal, the daily target is:
1870 + 1265 = 3135 kcal
If the macro ratios are 25% protein, 45% carbohydrates, and 30% fat, the resulting targets are approximately 196 g protein, 353 g carbohydrates, and 105 g fat.
The earlier inconsistent result came from using 4070 kcal for the macro ratios while the dashboard displayed 3135 kcal as the day’s target. That produced 254 g protein, 458 g carbohydrates, and 136 g fat because those values are the 25/45/30 split of 4070 kcal. The difference was the configured baseline activity amount being retained in the macro calculation after tracker activity had already been recorded.
Track carbs as
Choose Total Carbs or Net Carbs. Net carbs generally subtract fiber and sugar alcohols. Use the option that matches the data source and the way you plan your diet.
Macro calculation modes
| Mode | What it does |
|---|---|
| Ratios | Sets Protein, Carbs, and Fat as percentages of the energy target. The percentages should total 100%; gram targets change when the energy target changes. |
| Fixed Targets | Sets explicit daily gram targets. They remain fixed when the energy target or exercise changes; Fuel Lens warns when their calories do not closely match the energy target. |
| Keto Calculator | Derives protein from lean body mass, applies a net-carb limit, and assigns the remaining energy to fat. |
Keto Calculator
- Current Weight is read from imported biometrics when available.
- Body Fat % is used with Current Weight to estimate lean body mass (LBM).
- Protein (g per kg LBM) multiplies LBM to calculate the protein target.
- Net Carbs Limit sets the upper carbohydrate target using the selected Net Carbs basis.
- Fat (Remainder) receives the remaining energy after protein and carbohydrates.
- Keto Program offers built-in presets or Custom values.
- Athletic Bonus adds 1 g of carbohydrates per 50 kcal of exercise to the keto carbohydrate target.
- Editing calculated protein or carbohydrate values switches the program to Custom.
Built-in keto presets:
| Program | Net carbs | Protein |
|---|---|---|
| Rigorous | 20 g/day | 1.0 g/kg LBM |
| Moderate | 40 g/day | 1.5 g/kg LBM |
| Relaxed | 50 g/day | 2.5 g/kg LBM |
The calculator is a planning aid. It does not replace an individually appropriate nutrition recommendation.
Saving changes
Review the values across the nested tabs, including the tracker activity override, then use Save settings at the top of the settings page. The settings are stored in this browser and are used by the dashboard, trends, diary, and goal views.
Scientific context
The macro targets on this page are configurable planning values. A percentage split or the Keto Calculator output is not, by itself, evidence that a particular diet is suitable for an individual. For context, EFSA publishes population-level reference intake ranges for energy-yielding macronutrients; those ranges are different from a personalized prescription.
- EFSA: Dietary reference values explains reference intake ranges for macronutrients and how reference values are used.
Related guides
Continue with these connected Fuel Lens guides.