Nutrition estimates,
with the working shown.
Use this page to understand a calorie estimate, check the macro arithmetic and turn a number into questions you can review. The examples explain Phasebuilt's current engine; they do not measure your individual requirements.
Which calculator answers your question?
On a small screen, scroll the table sideways to read every column.
| Question | Tool | What it cannot tell you |
|---|---|---|
| What daily energy estimate do these inputs produce? | Calorie calculator | Your measured energy expenditure or a guaranteed rate of weight change. |
| How many grams does the protein default produce? | Protein calculator | Whether that amount suits a medical condition or an individual dietary need. |
| How are protein, fat and carbohydrate allocated? | Macro calculator | Whether a particular meal or food brand matches those targets. |
A complete worked calorie example
For a fictional 32-year-old man, 175 cm tall and weighing 78 kg, with the “moderately active” factor of 1.55, the builder calculates the following. This example assumes the standard recovery setting, fat-loss goal and steady pace.
On a small screen, scroll the table sideways to read every column.
| Step | Calculation | Result |
|---|---|---|
| Resting-energy estimate | 10 × 78 + 6.25 × 175 − 5 × 32 + 5 | 1,718.75 kcal |
| Activity estimate | 1,718.75 × 1.55, rounded to the nearest ten | 2,660 kcal |
| Steady fat-loss adjustment | 2,660 − 375 | 2,285 kcal |
| Protein default | 78 × 1.8, rounded | 140 g |
| Fat default | 78 × 0.8, rounded | 62 g |
| Carbohydrate remainder | (2,285 − 140 × 4 − 62 × 9) ÷ 4, rounded | 292 g |
The rounded macros represent 2,286 kcal: 140 × 4 + 62 × 9 + 292 × 4. The one-calorie difference is rounding, not an extra food allowance. The activity factor and goal adjustment are planning choices. They are not part of the original resting-energy equation and do not establish an appropriate intake for every person.
Why the activity answer matters
Keep the same fictional measurements but select “mostly seated” (1.2). The engine returns a 2,060 kcal activity estimate and a 1,685 kcal steady fat-loss estimate. That is a 600 kcal difference caused by one assumption, not a change in body measurements. A few weekly workouts do not automatically establish how active the rest of a week is.
Read the activity descriptions, record the choice you made, and avoid selecting a higher level just to obtain a preferred number. The builder adds 100 kcal back to a fat-loss estimate when short sleep or high stress is selected. Its standard calculators do not ask those recovery questions. Matching the inputs matters when comparing the outputs.
From a target to an ordinary meal
Suppose lunch is a bowl of rice, beans, vegetables and a dressing. A nutrition check needs the quantities and the food data: cooked and uncooked rice weights are different entries, beans vary by preparation, and a dressing contributes energy even when it is a small part of the bowl. Use the product label or an appropriate food-composition entry, and keep the serving basis consistent.
A practical preparation note might record “cooked rice, drained beans, frozen vegetables, dressing measured separately.” It should not claim a precise macro total unless the amounts and data have actually been added. A vegetarian swap is not automatically nutritionally equivalent gram for gram. Phasebuilt's meal estimates are starting examples; check labels and portions rather than treating a displayed total as a laboratory measurement.
Review the estimate and its limits
Keep a short record of the inputs, the target shown and the date. Review whether the routine is practical, how training and day-to-day energy feel, and whether the underlying activity assumption still describes your week. A single day's change in scale weight cannot validate a calorie equation. A clinician or registered dietitian can help interpret individual concerns.
The calorie and macro tools withhold unsupported combinations, including targets outside 1,500–4,500 kcal and those leaving less than 80 g carbohydrate under the product's allocation. These are software limits, not universal safe-intake thresholds. The tool is for general adult estimates and does not plan for pregnancy, breastfeeding, postpartum recovery, eating disorders or conditions requiring individual nutrition advice.
Continue with the full calculation method, protein assumptions, or the builder when you also need a training structure.
External references: USDA on estimated nutrient needs and individual variation; NIDDK Body Weight Planner and its intended audience. Neither source validates Phasebuilt's product defaults.
Reviewed 26 October 2026 by Phasebuilt. Worked examples are fictional teaching examples, not client results or individual prescriptions. No clinical review is claimed.