Both Body Fat 3-Site Skinfold Calculator and Lean Body Mass Calculator sit in the Health & Medical category. They share an underlying model (us navy body-fat formula) but target different outcomes: Body Fat 3-Site Skinfold on one side, Lean Body Mass on the other.
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Body Fat 3-Site Skinfold Calculator computes body fat 3-site skinfold directly in your browser. It is built for body fat estimate and uses us navy body-fat formula based on the inputs you provide.
Lean Body Mass Calculator computes lean body mass directly in your browser. It is built for lean body mass estimate and decision support and uses reference table lookup with linear interpolation based on the inputs you provide.
| Attribute | Body Fat 3-Site Skinfold Calculator | Lean Body Mass Calculator |
|---|---|---|
| Category | Health & Medical | Health & Medical |
| Primary input | Sex, age, weight, neck, waist, hip | Height, weight, age, sex, activity |
| Primary output | Body fat %, category | Lean Body Mass result, derived from the inputs above |
| Math model | US Navy body-fat formula | Reference table lookup with linear interpolation |
| Best for | Body fat estimate | Lean Body Mass estimate and decision support |
| Runs in browser | Yes, no data leaves your device | Yes, no data leaves your device |
| Login required | No | No |
| Cost | Free | Free |
Under the hood, Body Fat 3-Site Skinfold Calculator uses us navy body-fat formula fed by sex, age, weight, neck, waist, hip. Lean Body Mass Calculator uses reference table lookup with linear interpolation fed by height, weight, age, sex, activity. The two are not substitutes; they answer adjacent questions in your workflow.
Pick Body Fat 3-Site Skinfold Calculator when your question is about body fat 3-site skinfold and your inputs are sex, age, weight, neck, waist, hip. Pick Lean Body Mass Calculator when the question shifts to lean body mass and your inputs become height, weight, age, sex, activity. If neither matches what you need, the Health & Medical category hub lists every tool we have for related questions.
Your task is personal health metric estimation and you already have height, weight, age, sex, activity. The output you need is a score, range, daily target.
Your task is personal health metric estimation and you have height, weight, age, sex, activity. The output you need is a score, range, daily target.
Browse the Health & Medical hub for related tools, or the Health & Medical hub for the other side.
Body Fat 3-Site Skinfold Calculator is designed to answer questions about body fat 3-site skinfold using sex, age, weight, neck, waist, hip. Lean Body Mass Calculator is designed for lean body mass using height, weight, age, sex, activity. They are complementary tools that target different inputs and outputs.
Use Body Fat 3-Site Skinfold Calculator when your task is body fat estimate and you need a body fat %, category from sex, age, weight, neck, waist, hip.
Use Lean Body Mass Calculator when the question is lean body mass estimate and decision support and your inputs are height, weight, age, sex, activity. The result is a lean body mass result, derived from the inputs above.
Yes. Both run entirely in your browser, require no login, and are free to use without limits. Your inputs are not transmitted to any server.
Accuracy depends on the inputs you provide, not on the tool. Body Fat 3-Site Skinfold Calculator uses us navy body-fat formula and is accurate for body fat 3-site skinfold when its inputs are correct. Lean Body Mass Calculator uses reference table lookup with linear interpolation and is accurate for lean body mass under the same condition.