Hip Circumference Calculator
The formula
What the hip circumference tells you
Tape-meat body composition for hip circumference: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms.
Calculation: US Navy: BF% = 86.010·log₁₀(waist−neck) − 70.041·log₁₀(height) + 36.76 (men); +1.08·…−84.52 women. Enter your inputs and every substitution is shown below the result.
Reading the result
Track the trend monthly under the same conditions; ±2 points of tape error is normal.
Limitations and best practice
Hydration and recent meals shift centimetres — measure fasted, morning, same spot.
This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Frequently asked questions
How accurate is tape-meat body fat?
Which formula is best for me?
Source & methodology
US Navy Body Composition Program method.
Hip Circumference: the number, the method and the caveats
You are here because you need a specific number, and you want to see how it was produced before you rely on it. Hip Circumference is the kind of number people argue about from memory. This page ends that argument with arithmetic you can watch happen: enter your figures, get Body fat in real time, and see every substitution printed below.
Trends beat snapshots. Hip Circumference measured once tells you where you stand today; measured monthly against Weight (kg) tells you which way the needle is moving — and direction is the actionable information in Body Measurements.
Like most useful measures, Hip Circumference is a summary, and summaries hide as much as they reveal. The companion outputs and the input table are here to reopen what the headline compressed.
Nothing below is stock text pasted around a number: the worked example computes body fat = 26.6% from this tool’s own defaults, and the sensitivity section ranks the inputs that move the result — Waist / hip circumference first, at ≈25.5 % of the headline for a ten-percent error either way in that input. Work down the page and by the end you could re-derive the result in a spreadsheet from memory.
Inside the Hip Circumference calculation: formula and every input
Here is the complete model this tool runs — US Navy: BF% = 86.010·log₁₀(waist−neck) − 70.041·log₁₀(height) + 36.76 (men); +1.08·…−84.52 women — with each input explained below. If a competitor’s page gives you a different answer from the same inputs, this is the text that settles which of you is right.
Weight (kg) (example value 185) is a quantity rather than a category — precision here is cheap and worth having. Weigh rather than estimate where you can — this field usually enters the formula multiplicatively.
Height (cm) (example value 183) is a plain measured quantity — the unit shown in the label is the unit the formula expects. Keep every length field in the same unit; the formula assumes a consistency it cannot check for you.
Neck / waist circumference (cm) (example value 35) is a quantity rather than a category — precision here is cheap and worth having. Replace the example with the figure from your own records — the tool recomputes instantly and the printed steps follow your numbers.
Waist / hip circumference (cm) (example value 88) is a plain measured quantity — the unit shown in the label is the unit the formula expects. The example value is there to demonstrate the mechanics, not to describe your situation — overwrite it.
Sex (example value Male) is a choice rather than a quantity — pick the option that matches your situation, because the calculation path branches here. The example value is there to demonstrate the mechanics, not to describe your situation — overwrite it.
What each “Sex” choice actually does: Male → 26.6% · Female → 2.0% That table is the honest answer to “does this option matter”, re-derived from the formula rather than hard-coded into page copy.
The default Hip Circumference calculation, written out in full
Abstract formulas are hard to trust, so here is the complete substitution using the default inputs, written the way an examiner would want it. Starting figures: Weight (kg), Height (cm), Neck / waist circumference (cm), Waist / hip circumference (cm). The computed body fat comes out at 26.6%, which the interpretation band labels “Above the healthy band — the trend matters more than today’s point”.
- Circumference difference waist−neck = 53.0 cm
- Navy formula (log₁₀ terms) → 26.6 %
- Fat mass = 185.0 × 26.6 % = 49.2 kg
Fat mass — 49.2 kg. Read next to the headline, this is the figure that shows the shape of the trade-off.
Lean mass — 135.8 kg. This is the number experienced users quote when the headline alone would mislead.
BMI — 55.2. This is the number experienced users quote when the headline alone would mislead.
Keep this worked example open while you enter your own figures: matching the shape of the substitution is the fastest way to spot a unit or convention mistake.
The Hip Circumference corridor: your result across a realistic band
Read this table as the practical error bar on the headline figure. It answers the question people actually have after seeing a single number: how wrong could this be if the main input is off by ten or twenty percent?
| Waist / hip circumference setting | Body fat |
|---|---|
| 80 % of the example value | 11.5% |
| 90 % of the example value | 19.8% |
| example inputs | 26.6% |
| 110 % of the example value | 32.3% |
| 120 % of the example value | 37.3% |
The corridor runs from 11.5% to 37.3% across that band — which is the range worth planning inside rather than the single 26.6% point estimate. Reproduce it in the form above by editing Waist / hip circumference alone; the substitution steps will follow your figures exactly.
The levers behind Hip Circumference, ranked by effect
Generic advice says “it depends on your inputs”; this section says exactly how much. Each field was perturbed by ±10 % in isolation and the body fat recomputed, so the ranking below is measured rather than asserted. Read it as a map of where Hip Circumference is fragile — drawn for the example inputs, which is the map you want when deciding what to measure carefully.
- Waist / hip circumference: ten percent up gives 32.3%, ten percent down gives 19.8% — ≈25.5 % of the body fat either way
- Nudge Height by ±10 % and Hip Circumference lands between 23.7% and 29.8% (sensitivity ≈12.0 %)
- Neck / waist circumference +10 % → Hip Circumference = 24.0% · −10 % → 29.0% (the body fat shifts ≈9.6 %)
Waist / hip circumference is the dominant lever here: ten percent either way moves the result by about 25.5 %, from 19.8% to 32.3%. Measure that input from a document rather than from memory, and treat Height as the second priority (≈12.0 % per ten percent). Everything below that can stay approximate, which is a licence to stop chasing data that would not change the decision.
Interpreting the Hip Circumference verdict
The value above only becomes useful the moment you know what it is being measured against. The verdict attached to the default calculation — “Above the healthy band — the trend matters more than today’s point” — is one band on a ladder your own figure may sit somewhere else on. Before treating the band as fact, note its width: ten percent either way on Waist / hip circumference already spans 19.8% to 32.3%. The practical reading rules: compare against your own history before comparing against other people; treat band boundaries as zones, not walls — one point on the wrong side of a threshold rarely changes a real outcome; and when a companion output contradicts the headline, believe the pair.
Where Hip Circumference sits next to similar measures: this tool answers “how much is the Hip Circumference”, while the related calculators answer “what do I do about it”. Reading the result alone tends to over-weight a single snapshot; pairing it with the companion tools above turns the number into a decision.
Common mistakes with Hip Circumference (and the fix)
Hydration and recent meals shift centimetres — measure fasted, morning, same spot. This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Acting on one reading. Day-to-day variation is real; confirm any surprising Hip Circumference on two separate occasions before changing behaviour.
This model has its own particular trap: Waist / hip circumference carries ≈25.5 % of the response per ten percent of error, so effort spent elsewhere is largely decorative.
A final trap is presentation: reporting Hip Circumference to more decimal places than the inputs support. The tool prints what the arithmetic gives; you should quote only what your least precise field justifies.
Six things to confirm before acting on Hip Circumference
- Note the date and the inputs beside the number so the figure can be audited later.
- Confirm the example values are plausible for your own situation before replacing them.
- Put Waist / hip circumference under a magnifier; the sensitivity table above is the reason why.
- Compare the output against one published benchmark or a colleague’s independent estimate.
- Re-run the calculation with a ±10 % stress on the two most sensitive inputs.
- Run the ±10 % stress on the top two levers and check that your conclusion survives both.
Step by step: getting a trustworthy Hip Circumference out of this tool
Using a calculator well sounds trivial, but the difference between a decision-grade figure and a throwaway one lives entirely in the routine. The routine for Hip Circumference takes a minute to learn and applies to every input above.
Step 1 — collect, then type. Everything this tool asks for is listed above (weight (kg), height (cm), neck / waist circumference (cm), waist / hip circumference (cm), sex). Pull each figure from something you can point at — paperwork, a dashboard, a label — before touching a field. Guesswork at the input stage cannot be repaired at the interpretation stage. A figure nobody can reproduce is a figure nobody will act on twice.
Step 2 — baseline before exploration. Get one defensible Body fat on screen before you start nudging numbers. Without a baseline, every variation looks interesting and none of them means anything. A figure with a date beside it becomes evidence; without one it stays an anecdote.
Step 3 — play with the inputs on purpose. Ten percent up, ten percent down, one field at a time. Within a few minutes you will know this calculation better than most people who quote its results. Numbers are cheap to produce and expensive to retract; the extra minute is the cheapest insurance available.
Step 4 — stress before you commit. A decision that survives a ten-percent squeeze on its two biggest inputs needs no luck to be sound. One that does not survive is a decision about hope, not about arithmetic. If the answer changes your behaviour, it deserves a second run with different assumptions.
Step 5 — save the story with the figure. A number without its inputs and its date is unusable within a quarter. Record 26.6%, the assumptions behind it, and today’s date; your future self will be auditing a stranger’s arithmetic. Note the assumption you are least sure about; that is where the real risk lives.
Where Hip Circumference matters in practice
In Body Measurements the figure computed here is usually the first one somebody asks to see. Having it — with the formula behind it — changes your position in the conversation from participant to reference. Numbers are cheap to produce and expensive to retract; the extra minute is the cheapest insurance available.
Used properly this is a five-minute filter that saves weeks. Compute Hip Circumference, reject what fails, and only then bring in the expensive analysis for the survivors. The point of transparency is that a reader can disagree with a specific line rather than with you.
Treat Hip Circumference like a smoke alarm rather than a painting — its value is in being tested periodically, not in being admired once. Comparisons are cheap: run the identical calculation for the alternative and look at the gap.
The questions that come up most about Hip Circumference
What affects Hip Circumference the most?
Hip Circumference is driven above all by Waist / hip circumference. Perturbing only that field by ten percent either way produced 32.3% against the 26.6% baseline — a ≈25.5 % response, while Height manages ≈12.0 %.
Which matters more: height or waist / hip circumference?
For Hip Circumference, Waist / hip circumference wins the head-to-head (≈25.5 % against ≈12.0 % per ten-percent change). Knowing which input dominates is the difference between careful work and merely slow work.
How much does the “Sex” choice change the answer?
A great deal, on these inputs: Hip Circumference comes out at 2.0% on the lowest option (“Female”) and 26.6% on the highest (“Male”). Each option is listed with its computed value so you can see what the choice is worth before you make it.
What is a typical Hip Circumference?
There is no honest universal average for Hip Circumference, but there is a reference point: the defaults on this page produce 26.6% (Above the healthy band — the trend matters more than today’s point). Replace the inputs with your own and compare — that comparison is the useful meaning of “typical”.
How do I calculate Hip Circumference by hand?
US Navy: BF% = 86.010·log₁₀(waist−neck) − 70.041·log₁₀(height) + 36.76 (men); +1.08·…−84.52 women is the entire method. Work the inputs in that order — Circumference difference waist−neck = 53.0 cm — and you will reach 26.6% on the default figures, the same number this tool prints.
What happens to Hip Circumference if waist / hip circumference changes by 10 %?
On these inputs a ±10 % change in waist / hip circumference takes Hip Circumference to 32.3% against the 26.6% example — around 25.5 % of the headline. The same test on every other field is in the sensitivity section.
Is the Hip Circumference result of 26.6% good or bad?
The tool answers “what”, not “whether”: 26.6% carries the verdict “Above the healthy band — the trend matters more than today’s point” for the default case, which is a starting interpretation rather than a verdict on your situation. Re-run with your own figures and compare the bands.
What affects Hip Circumference the most?
Sensitivity depends on where you start, but the inputs Weight (kg) and Height (cm) typically move Hip Circumference further than the rest because they enter the formula multiplicatively. If you can only measure two things well, measure those and hold the others at conservative defaults.
How do I calculate Hip Circumference manually?
Write down the inputs, then follow the printed steps in order — US Navy: BF% = 86.010·log₁₀(waist−neck) − 70.041·log₁₀(height) + 36.76 (men); +1.08·…−84.52 women. A spreadsheet replicates it with two or three cells. The manual route is worth doing once to build intuition; after that the calculator saves time and eliminates transcription slips.
How accurate is tape-meat body fat?
±3 points versus DEXA in lean subjects, better in groups; the trend is reliable even when the level is soft.
Which formula is best for me?
Consistency beats formula choice — the same method, same conditions, every time.
Does this Hip Circumference tool store my numbers?
No. The entire calculation runs in your browser session; nothing entered above is transmitted or saved, which is the correct behaviour for sensitive Health & Medical figures and the reason you can re-run this page as often as you like.
What the labels on this page mean
- Fat mass
- 49.2 kg for the Hip Circumference worked case; it sits next to the main result because it carries context the headline leaves out.
- Lean mass
- 135.8 kg in the default Hip Circumference calculation — one of the secondary figures an experienced reader checks before trusting the primary number.
- BMI
- 55.2 for the Hip Circumference worked case; it sits next to the main result because it carries context the headline leaves out.
- Body fat
- The primary output of this tool: 26.6% for the default inputs, computed exactly from US Navy: BF% = 86.010·log₁₀(waist−neck) − 70.041·log₁₀(height) + 36.76 (men); +1.08·…−84.52 women.
- Worked example
- The calculation written out in full so that nothing on this page has to be taken on trust.
- Verdict band
- The interpretation attached to a result (“Above the healthy band — the trend matters more than today’s point” on these inputs), which turns a bare number into a position on a scale.
- Sensitivity (±10 %)
- How far the Hip Circumference moves when a single input is nudged ten percent either way; the ranked list on this page is computed live from this engine.
Where the Hip Circumference model comes from
There is no black box on this page — the engine evaluates US Navy: BF% = 86.010·log₁₀(waist−neck) − 70.041·log₁₀(height) + 36.76 (men); +1.08·…−84.52 women. Source of record: US Navy Body Composition Program method. Specialist software layers extra coefficients on top of the same algebra; none are hidden here, and that transparency is what makes a disagreement traceable to a specific input instead of a black box.
Treat the output as a precise answer to the question you typed: exact arithmetic, transparent formula, published source, no hidden rounding. What that buys you is reproducibility — two people, two browsers, the same arithmetic, and a printed trail from inputs to result that either of them can audit.
Next steps after the calculation
Save the number together with its inputs and today’s date; a Hip Circumference figure without context is unusable the moment an input changes.
This page was written for people who need one trustworthy number before their next decision, and the promise is that nothing above required trust. Bookmark the tool, re-run it whenever an input moves by more than a few percent, and keep the date with the number.