Track body weight, body fat, waist, chest, shoulders, neck, hips, arms, forearms, thighs, calves and more—then automatically calculate FFMI, fat-free mass, BMI and useful physique ratios from one consistent measurement history.
Record weight and estimated body fat to derive fat-free mass and FFMI instead of watching scale weight alone.
Log trunk and limb measurements to see whether size is changing where your training goals actually matter.
Compare the latest entry with your first saved measurement rather than reacting to one noisy day.
The page saves entries in the current browser with localStorage. No measurement submission endpoint is used by this page.
A consistent log can separate useful long-term changes from ordinary variation caused by hydration, food intake, pump, posture and tape placement.
The bars are a visual overview, not health thresholds or target values.
Enter the measurements you have available. Only date is required. FFMI and other derived metrics appear automatically when the necessary inputs are present.
localStorage on the current browser. Export a CSV if you want a separate backup before clearing browser data or changing devices.
Derived from the measurements you entered; unavailable metrics display “—”.
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Add your first entry above to start the log.
Different measurements answer different questions. Combining body composition with circumferences makes a progress log much more informative than scale weight alone.
Useful for energy-balance context, but weight alone cannot show whether a change came mainly from fat, lean tissue, glycogen or water.
Adds composition context and allows estimated fat-free mass and FFMI to be calculated, although measurement error must be respected.
Helps distinguish torso-size changes from limb-muscle changes and supports waist-to-height and waist-to-hip tracking.
Chest, shoulders, arms and forearms can reveal where hypertrophy is occurring even when scale weight changes slowly.
Left/right thigh and calf measurements can help track leg development and identify meaningful asymmetry trends.
Repeated FFMI estimates can provide a height-adjusted view of fat-free mass when body-fat measurement is performed consistently.
A measurement log turns scattered body measurements into a useful longitudinal record. Instead of asking whether one scale reading or one arm measurement is “good,” the better question is whether your body composition and circumferences are moving in the intended direction over weeks and months.
This FFMIPro Measurement Log records more than 12 metrics because physique progress is multidimensional. Body weight can rise while waist size stays stable and arms or thighs increase. Conversely, body weight can remain similar while waist decreases and limb measurements stay steady, suggesting a different body-composition trend. FFMI adds another layer by indexing estimated fat-free mass to height.
For a dedicated one-time calculation, use the FFMI Calculator. For benchmark interpretation, browse the FFMI Database. If training volume is your next decision, use the Training Volume Calculator.
The tracker combines directly recorded measurements with automatically derived metrics. You do not need to fill every field. A useful log can start with only weight, waist and a few target circumferences, then become more detailed over time.
| Metric | Type | Why track it? | Key consistency rule |
|---|---|---|---|
| Body weight | Recorded | Tracks overall mass trend. | Use similar time, clothing and hydration conditions. |
| Body-fat % | Recorded | Provides composition context and enables FFMI. | Use the same method and protocol. |
| Height | Recorded | Required for FFMI, BMI and waist-to-height. | Use standing height without shoes. |
| Waist | Recorded | Tracks central circumference and ratios. | Use one anatomical site and breathing protocol. |
| Chest | Recorded | Tracks torso development. | Keep tape level and breathing state consistent. |
| Shoulders | Recorded | Tracks upper-torso circumference. | Use the same route around deltoids and torso. |
| Neck | Recorded | Additional frame and body-composition context. | Keep head neutral. |
| Hips | Recorded | Tracks lower-torso circumference and waist/hip ratio. | Use the same widest-point landmark. |
| Wrist | Recorded | Optional skeletal-frame context. | Measure at the same wrist location. |
| Left/right upper arm | Recorded | Tracks arm growth and side-to-side trends. | Choose relaxed or flexed and never mix protocols. |
| Left/right forearm | Recorded | Tracks forearm development. | Use the same maximum-circumference site. |
| Left/right thigh | Recorded | Tracks leg hypertrophy and symmetry. | Mark or standardize distance from a landmark. |
| Left/right calf | Recorded | Tracks calf development and symmetry. | Use the same maximum-circumference site. |
| Fat-free mass | Derived | Estimated non-fat body mass. | Accuracy depends on body-fat estimate. |
| FFMI | Derived | Indexes estimated fat-free mass to height. | Compare trends using consistent body-fat methods. |
| BMI | Derived | Indexes total body weight to height. | Use as general context, not muscularity alone. |
| Waist / height | Derived | Normalizes waist circumference to height. | Requires consistent waist and height measures. |
| Waist / hip | Derived | Tracks waist relative to hip circumference. | Use stable waist and hip landmarks. |
Professional anthropometry protocols are detailed because small procedural differences can change a measurement. The CDC/NHANES body-measures manual standardizes posture, anatomical landmarks, tape placement and examiner technique. A home measurement log does not need to reproduce a research lab, but it should borrow the same principle: standardize the procedure before interpreting the trend.
Measure at a similar time of day, ideally before training, and keep food, hydration and clothing conditions reasonably similar.
Choose a precise location for each circumference. If needed, write the site in your notes so future measurements use the same point.
The tape should contact the skin or clothing without compressing tissue. Excess tension can create artificial reductions.
Body weight is easy to measure but highly variable. Glycogen, sodium, hydration, food volume and bowel contents can move scale weight without meaningful changes in muscle or fat. If body weight is important to your goal, a weekly average can be more informative than comparing isolated days.
The Measurement Log accepts one weight value per entry. If you weigh daily, consider entering a weekly average as the official measurement-session weight or record the context in the notes. The key is to use a consistent rule.
Body-fat percentage is the most uncertain input in many FFMI calculations. DXA, BIA, skinfolds and visual estimates can produce different results. Because fat-free mass is calculated from body weight and body-fat percentage, any body-fat error flows directly into FFMI.
For progress tracking, consistency can be more useful than switching methods in search of perfect accuracy. If you normally use the same BIA device under standardized morning conditions, that trend may be easier to interpret than alternating between BIA, visual estimates and occasional DXA values. See Body Fat Measurement Protocols for a deeper guide.
There are multiple legitimate waist measurement protocols, which is exactly why you should choose one and keep it fixed. The CDC/NHANES anthropometry protocol places the tape horizontally at a standardized landmark near the iliac crest. Other organizations may use a midpoint or narrowest-waist protocol.
For a personal log, do not mix sites. Write your chosen landmark in the notes, keep the tape horizontal, avoid pulling it tightly into the skin and use a consistent breathing state. The number is most useful when the method stays unchanged.
Upper-body circumferences can be useful during hypertrophy phases because they may increase even when scale weight changes gradually. However, “pump” can temporarily enlarge measurements. Measure before resistance training or after a standardized rest period if you want comparable numbers.
For upper arms, decide whether you will measure relaxed or flexed. Both are valid for a personal log, but mixing the two destroys comparability. If left and right sides differ, track both rather than averaging them immediately; persistent asymmetry can then be seen in the raw history.
Leg circumferences are especially sensitive to tape placement. A difference of a few centimeters in measurement height can noticeably change the result. Use a repeatable anatomical reference—for example, a fixed distance from the patella or another documented landmark—and measure the same point each session.
Measure both sides. Short-term differences are not automatically meaningful, but a multi-session pattern can be useful when combined with strength and training data. Pair the log with the Training Volume Calculator if you are trying to connect muscle-size trends with weekly workload.
FFMI is most valuable as a trend when height is stable and body-fat estimation is repeatable. If body weight rises while estimated body-fat percentage stays similar, calculated fat-free mass and FFMI should rise. If body-fat percentage changes because you switched devices, the FFMI trend may move even when your actual lean mass did not.
Do not treat a tenth of an FFMI point as automatically meaningful. Review FFMI alongside waist, limb circumferences, training performance and the time between entries. For comparison with published athletes and populations, use the FFMI Database rather than applying one generic range.
For most physique goals, every two to four weeks is a practical interval for tape measurements. Muscle growth is slow enough that measuring every day usually creates more noise than insight. Body weight may be measured more frequently, but circumferences are easier to interpret when enough time has passed for a genuine change to exceed measurement error.
Advanced athletes may choose monthly standardized measurement sessions. During a short cutting phase, waist and body weight may be tracked more often. The best interval is the one you can repeat under similar conditions without becoming reactive to tiny changes.
No single pattern proves muscle gain or fat loss, but combinations can be more informative. If weight and FFMI rise slowly while waist remains relatively stable and target muscle circumferences increase, that is generally more consistent with productive mass gain than weight gain accompanied mainly by rapid waist expansion. During a cut, a falling waist with relatively stable limb measurements and strength can provide useful context.
Use the Measurement Log as a record, not a diagnosis. If body composition, unexplained weight change or other health concerns are medically significant, use appropriate clinical assessment rather than relying on home measurements.
Create one measurement protocol and write it down.
Save the raw measurements before interpreting them.
Look at first-to-latest and multi-session trends rather than one change.
Compare measurement trends with training performance, nutrition phase and recovery.
Educational tracking tool only. Home anthropometry and body-fat estimates contain measurement error and should not replace clinical assessment when medical evaluation is needed.
Turn your measurement history into better body-composition, training and progress decisions.
Calculate standard FFMI from a single set of height, weight and body-fat inputs.
Calculate FFMICompare your logged FFMI with published athlete and population benchmarks.
Browse DatabaseReview lean mass and body-fat related outputs beyond one measurement session.
Analyze CompositionConnect measurement changes with weekly hard-set volume by muscle group.
Plan VolumeUse your measurement trend to frame realistic lean-mass progress timelines.
Project GainsAdd age-specific population context when interpreting a logged FFMI result.
View Age NormsCommon questions about body measurement frequency, FFMI tracking, circumference protocols, local storage and progress interpretation.
This tool is intended for educational and personal progress tracking, not medical diagnosis.