Calculate a protein range for a weight-loss plan
The worked method below uses 1.2–1.6 g per kilogram of total body weight per day, the range discussed in the 2015 review by Leidy and colleagues. Enter your current total body weight and select kilograms or pounds in the calculator below. It returns both daily endpoints with the formula and source. This is a research-context estimate rather than a personal prescription; the result does not select an endpoint, set a calorie deficit or predict weight loss.
Calculate a protein reference range
Choose the published reference that matches your context.
Complete the fields, then calculate to see the method and result.
US Dietary Guidelines 2025–2030 · ISSN, 2017 · Leidy et al., 2015 · Method reviewed .
- Convert your body weight to kilograms if needed: pounds divided by 2.2046226218.
- Multiply kilograms by 1.2 for the lower result.
- Multiply kilograms by 1.6 for the upper result.
- Check the population and suitability of that reference before adopting an amount.
| Example body weight | Lower result | Upper result |
|---|---|---|
| 65 kg | 78 g/day | 104 g/day |
| 80 kg | 96 g/day | 128 g/day |
| 95 kg | 114 g/day | 152 g/day |
These examples scale a research range; they do not select a diet, calorie deficit or personal endpoint.
These rows calculate the same stated method at three weights. They do not select a weight-loss diet or decide which end of the range fits your circumstances.
If your health professional uses an adjusted weight or another reference, keep that method explicit. Do not substitute a goal weight or estimated fat-free mass without explaining the change. The calculator cannot determine the appropriate clinical method from a weight field alone.
How does protein fit within a calorie budget?
Protein grams still contribute to total energy. Using the conventional **4 kcal per gram** protein conversion, an illustrative 120 g protein amount represents 480 kcal of protein energy. Against an independently chosen 1,800 kcal budget, that is approximately 27%: 480 ÷ 1,800 × 100 = 26.7%.
Those numbers are bookkeeping examples, not recommended targets. A food supplying 30 g protein may also contain fat and carbohydrate, so its total calories are not necessarily 30 × 4. Use the actual food's label or suitable reference rather than recording only protein energy.
Increasing protein within a meal therefore requires looking at the whole meal. Simply adding a shake adds whatever calories its consumed portion contains; it does not automatically create an energy deficit. Choosing a protein amount also does not determine one mandatory carbohydrate or fat split.
For the separate calorie calculation, maintenance, deficit and target explains the relationship. Macros for weight loss covers converting a calorie budget into nutrient grams.
What does the weight-loss evidence actually support?
The Leidy review brings together studies of higher-protein diets for weight management, including energy-restricted diets, controlled feeding studies and longer interventions. It includes evidence in adults with overweight or obesity, rather than testing one online formula on every person who wants to lose weight. It is a synthesis of different studies, not one trial with a single participant profile.
That matters for interpretation: the range is a way to describe a higher-protein approach examined in that literature. It is not a validated prediction of what you personally will lose. Results over longer periods were mixed, and following the eating pattern was part of the context. This calculator scales the stated range; it does not reproduce those interventions or establish that their participants match your circumstances.
Protein intake, appetite, body-weight change and muscle retention are different questions. A calculator performs a multiplication. It does not measure any of those outcomes or determine whether an eating pattern is practical for you.
Training-specific guidance is also distinct. The protein calculator for training uses an exercise reference. Do not transplant a sports or fat-free-mass recommendation into this total-body-weight calculation because its multiplier is larger.
For food choices and organizing meals, protein for weight loss explains how to check protein-containing portions and fit them into your usual eating pattern. Use it after you understand the amount and its assumptions.
For the general US daily guideline comparison, see the protein intake calculator. Its current-guideline range and separate RDA comparison have different meanings from the weight-management reference used here.
Use a chosen target without turning the result into a rule for every meal
Once a suitable daily amount has been selected, inspect your actual portions. In a hypothetical label example, 10 g protein per 100 g becomes 17 g in 170 g of food. Include the calories and other nutrients from that portion too.
If an already chosen 100 g target is split equally across four eating occasions, that is 25 g at each as arithmetic. You do not need four meals or equal shares just because the division is convenient. A meal schedule and a dietary reference answer different questions.
Keep incomplete records visible. A low recorded total after only lunch has been logged is different from a complete day's intake. Revising a food quantity is also different from changing the daily protein target.
IZeat is the five-star chef calorie tracker that suggests satisfying, great-tasting meals, so you enjoy every calorie you have left. After connection to a compatible assistant, it can record the target you confirm and return totals from logged meals. The assistant can discuss those totals and proposed meals; a proposed meal is not recorded as eaten. IZeat does not prescribe weight loss, store body weight or measure body composition.
The connection instructions explain how to connect a compatible assistant before recording a target or meal.
When is this estimate insufficient?
A generic adult reference does not cover a prescribed nutrition treatment. If you have kidney disease, follow your care team's plan; NIDDK describes why the protein balance needs individual attention.
Pregnancy, breastfeeding, childhood and treatment after bariatric surgery need appropriate guidance. This page supplies no protein or calorie prescription for those situations. A clinician-set amount should remain distinguishable from an online estimate.
Frequently asked questions
Short answers to the questions people type, each one sourced above.
Does this calculator work differently for women and men?
The displayed multiplication uses body weight and the stated factor, so it does not include a hidden sex coefficient. That does not make it a complete assessment for every adult. Life stage, health and the selected reference may change the appropriate approach.
Should I choose the lower or upper result?
The calculation does not contain a rule that selects an endpoint from your weight alone. At 80 kg, the reference gives 96–128 g; choosing 128 simply because it is higher would add a decision the formula has not justified. Compare the range with complete food records, your independently chosen energy budget and any prescribed target. Retain the range until the personal target has been selected with those details in view; an arbitrary midpoint is not a more accurate recommendation.
What weight should I enter if my current and goal weights differ?
For the method shown, enter current total body weight to calculate what this reference produces at that weight. The result is still a reference estimate, not proof that this is the appropriate clinical calculation for you. If your care team specifies an adjusted weight, goal weight or another method, follow that named method rather than silently substituting its weight into this formula. This page does not derive an adjusted weight from your height or choose one for you.