Setting Up Your First Calorie Target — a 30-Minute Workflow

Setting your first calorie target correctly is the most important 30 minutes you will spend on your nutrition. Get it right and every log, every meal photo, every weekly check-in reinforces a plan that actually works. Get it wrong and you spend weeks eating too little (miserable, bingey) or too much (no progress, confused) before realizing the foundation was off. This workflow takes 30 minutes end-to-end and produces a target you can trust for at least the next 6–8 weeks.

You need three numbers: your Total Daily Energy Expenditure (TDEE), your goal rate of change, and your macro split. CalEye calculates all three automatically once you enter your profile data — but understanding the inputs makes you a better editor of the output. Don’t blindly accept the app’s default if it doesn’t match your situation. This guide explains every field and why it matters.

Minutes 0–5: Gather Your Baseline Measurements

Before opening the app, collect these numbers. Weigh yourself first thing in the morning after using the bathroom, before eating or drinking.

Required inputs:

• Current weight (kg or lbs) — morning weight, once only
• Height — measured, not estimated
• Age
• Biological sex (affects metabolic rate calculation)
• Activity level (see below)

Activity level — choose honestly:

Level	What it actually means
Sedentary	Desk job, no formal exercise, fewer than 5,000 steps/day
Lightly active	1–3 intentional workouts/week or 7,000+ steps/day
Moderately active	4–5 workouts/week or physical job
Very active	Daily hard training or physically demanding job
Extra active	Twice-daily training or elite athlete

Most office workers with a gym habit are “lightly active,” not “moderately active.” Overestimating activity is the most common setup error and adds 200–400 kcal to the target — enough to erase a deficit entirely.

Why does biological sex affect the calculation? The Mifflin-St Jeor equation — the current clinical standard for basal metabolic rate estimation, validated in a 2005 Journal of the American Dietetic Association study as the most accurate predictive formula for non-obese adults — includes a sex-specific constant because, on average, males have higher lean mass relative to total body weight than females at equivalent weights and heights.¹ The difference is approximately 5 kcal/day at the BMR level, which the activity multiplier then amplifies to a total TDEE difference of 100–200 kcal/day at most activity levels. This is a statistical average, not a biological law: individual variance within each sex is substantially larger than the between-sex mean difference.

Minutes 5–12: Enter Your Profile in CalEye

Open CalEye. Tap Profile → Nutrition Setup.

1. Enter weight, height, age, sex
2. Select your activity level from the table above
3. Tap Calculate TDEE — the app shows your estimated maintenance calories
4. Review the number. For most adult women, TDEE falls between 1,600–2,200 kcal. For men, 2,000–3,000 kcal. If your result is far outside these ranges, recheck your activity level selection.

The TDEE is your maintenance line — the calories needed to stay at your current weight. Every goal is an adjustment from this number.

A few things worth knowing about TDEE estimates before you trust the number. Predictive equations like Mifflin-St Jeor estimate TDEE with a mean error of approximately ±10% in populations, but individual errors can reach ±15–20%.¹ A person with unusually high or low lean mass for their body weight will have a real TDEE that diverges from the formula output. This is why the 2-week check-in (covered in the final section) is essential: the formula gives you a starting hypothesis. Actual weight trend data gives you the truth.

If you have a wearable device (Apple Watch, Fitbit, Garmin) that estimates daily energy expenditure, you can cross-check the app’s TDEE estimate against your wearable’s average. Wearable estimates are also imperfect — they tend to overestimate expenditure for people with high body fat percentages and underestimate for people with very high aerobic fitness — but they provide an independent data point. If your wearable consistently reports 300+ kcal above or below CalEye’s estimate, that’s a signal worth investigating before you commit to the target.

Minutes 12–20: Set Your Goal Rate

Tap Goal on the setup screen.

For fat loss:

• Choose a rate of 0.5–1.0 kg/week (1–2 lbs/week)
• CalEye subtracts 500–1,000 kcal from your TDEE to create your daily target
• Never go below 1,200 kcal/day (women) or 1,500 kcal/day (men) regardless of calculated deficit
• If the target feels aggressive, select 0.25 kg/week — sustainable beats fast

For muscle gain:

• Choose a rate of 0.25–0.5 kg/week
• CalEye adds 200–500 kcal above TDEE
• Too large a surplus adds fat, not muscle — stay conservative

For maintenance:

• Select Maintain current weight
• Your target equals your TDEE

Confirm the target. The app displays your daily calorie budget prominently on the home screen.

The 0.5–1.0 kg/week fat loss rate is the range with the most clinical support for sustainable outcomes. Faster rates (1.5+ kg/week, requiring deficits of 1,500+ kcal/day) produce proportionally more lean mass loss alongside fat loss, and are associated with greater adaptive thermogenesis — the body’s metabolic response to aggressive restriction that reduces total energy expenditure beyond what weight loss alone would predict.² Faster is not always better for body composition.

For people with significant weight to lose (BMI above 35), rates at the higher end of this range (0.75–1.0 kg/week) are appropriate in the early months. As total body weight decreases, the sustainable rate typically falls — both because the deficit required represents a larger percentage of TDEE and because adaptive thermogenesis accumulates over the course of restriction. Revisiting the goal rate at the 8-week mark is standard practice.

A note on the minimum floor. The 1,200 kcal floor for women and 1,500 kcal floor for men is not arbitrary. Below these levels, meeting micronutrient requirements from food alone becomes difficult without fortified foods or supplementation, and protein intake sufficient to preserve lean mass while in a deficit is mechanically impossible at most realistic food densities. These minimums exist in clinical practice for this reason — they are not conservative approximations.³

Minutes 20–25: Configure Your Macro Split

Tap Macros in the setup menu.

The CalEye default split is:

• Protein: 30%
• Carbohydrate: 40%
• Fat: 30%

Adjust this based on your approach:

• Higher protein (for muscle or hunger control): Set protein to 35–40%, reduce carbs proportionally
• Lower carb (keto or diabetic management): Set carbs to 10–20%, increase fat
• Endurance athlete: Increase carbs to 50–55%

The app recalculates gram targets automatically. Tap Save. Your macro rings appear on the home screen, empty and ready.

The default 30% protein is on the higher end of general population recommendations and is deliberately so. Meta-analyses of protein intake and body composition during caloric restriction consistently find that higher protein intakes (1.6–2.4 g/kg body weight) preserve more lean mass than moderate intakes (0.8 g/kg), with the effect size being larger in people who resistance train.⁴ At a 2,000 kcal target with 30% protein, you’re getting 150 g of protein — approximately 1.7 g/kg for an 87 kg person, which sits in the effective range for most people in a fat-loss phase.

The carbohydrate and fat split is more flexible than the protein target. For most healthy adults without specific carbohydrate management goals, the ratio between carbohydrates and fats matters less than total calorie balance and protein adequacy. Set it according to your dietary preferences and any medical guidance you have received.

For people managing Type 2 diabetes or pre-diabetes: the lower-carbohydrate presets in CalEye are calibrated against ADA Standards of Care 2024, which acknowledge low-carbohydrate dietary patterns as evidence-based approaches for glycaemic management while emphasising individual variation in response.³ Discuss specific carbohydrate targets with your care team before applying them here.

Minutes 25–30: Set Your First Check-In Date

Tap Progress → Schedule Check-In. Set a reminder for exactly 2 weeks from today. This is your data point — not a weigh-in in 3 days when you’re bloated, not in 6 weeks when you’ve forgotten why the target was set.

At the 2-week mark, you’ll have enough logged data (at least 10–12 days) to assess whether the target is calibrated correctly. If you lost less than expected, reduce by 100 kcal and check again in 2 weeks. If you’re losing faster than your goal rate, add 100 kcal.

Calorie targets are hypotheses. The 2-week check-in is how you test them.

Why 2 weeks rather than 1 or 4? One week is too short: weight fluctuates by 1–3 kg within a week due to glycogen and water shifts that have nothing to do with fat loss. These fluctuations can completely mask the signal of a genuine deficit or surplus. Four weeks is too long: if the target is genuinely off, you spend an additional month without progress before making a correction. Two weeks produces a 7-day average from each of two weeks that smooths most short-term fluctuation while allowing prompt recalibration.²

Track your weight daily during this period (mornings, post-bathroom, before eating), but judge progress on the 7-day averages, not the daily readings. The trend is the signal; the daily reading is noise.

The 30-Minute Setup Checklist

• Morning weight measured (before food, after bathroom)
• Height and age confirmed
• Activity level selected honestly
• TDEE reviewed and within expected range
• Goal rate set (0.5–1.0 kg/week for loss)
• Daily calorie target visible on home screen
• Macro split customized if needed
• 2-week check-in reminder set

Open CalEye. Start the clock. In 30 minutes you’ll have a number you can actually trust.

References

1. Frankenfield D, Roth-Yousey L, Compher C. “Comparison of Predictive Equations for Resting Metabolic Rate in Healthy Nonobese and Obese Adults: A Systematic Review.” Journal of the American Dietetic Association 105, no. 5 (2005): 775–789.

2. Hall KD, Kahan S. “Maintenance of Lost Weight and Long-Term Management of Obesity.” Medical Clinics of North America 102, no. 1 (2018): 183–197.

3. American Diabetes Association Professional Practice Committee. “Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes — 2024.” Diabetes Care 47, Supplement 1 (2024): S77–S110.

4. Morton RW, Murphy KT, McKellar SR, et al. “A Systematic Review, Meta-Analysis and Meta-Regression of the Effect of Protein Supplementation on Resistance Training-Induced Gains in Muscle Mass and Strength in Healthy Adults.” British Journal of Sports Medicine 52, no. 6 (2018): 376–384.