The best body fat caliper for most people is the Slim Guide, because its plastic body, 80 mm range and constant 10 g per square millimeter spring pressure suit self-testing at home. However, your skill matters more than price. Choose the Lange for a metal dial, or the Harpenden for lab-style readings.
In short: buy the Slim Guide for general home and gym use, the TrimCal 4000 on a tight budget, and the Lange or Harpenden for a research-style metal dial.
As an Amazon Associate, Measuring Expert earns from qualifying purchases. Our picks are based on research, specifications and owner feedback, not paid placement.
Best Overall
Best Budget Plastic
Best Pro Caliper
Quick Answer: Which Caliper Fits You?
- Most people: the Slim Guide, with an 80 mm range and constant 10 g per square mm pressure.
- Tight budget: the TrimCal 4000, a plastic caliper with an 80 mm range and a chart in the box.
- Metal dial: the Lange, with a 60 mm range and a long research history.
- Research grade: the Harpenden, with a 0.2 mm dial and Windows software.
- Trainers and students: the Cescorf kit adds a bone caliper and a 2 m tape.
- Keep in mind: every skinfold caliper gives an estimate, not a direct measurement of body fat.
On This Page
- Comparison table
- The 5 picks, reviewed
- How we chose
- Plastic vs metal calipers
- What a caliper really measures
- How to use a caliper
- Formula and worked examples
- Calibration and care
- FAQ
- Bottom line
Best Body Fat Caliper: Comparison at a Glance
| # | Product | Best For | Standout Feature | Amazon |
|---|---|---|---|---|
| 1 | Slim Guide Skinfold Caliper | Home and gym skinfold tracking | 80 mm range and constant spring pressure | View |
| 2 | Sequoia Fitness TrimCal 4000 Body Fat Caliper | A low-cost plastic caliper with a chart | 80 mm range and a dual-spring pistol grip | View |
| 3 | Seko USA Lange Skinfold Caliper With Case | A lab-style metal dial caliper | Hinged jaws and a 0 to 60 mm dial | View |
| 4 | Harpenden Skinfold Caliper With BodyTracker Software | Research-style readings with a 0.2 mm dial | 0.2 mm dial and Windows body fat software | View |
| 5 | Cescorf Level 1 Anthropometry Kit With Skinfold Caliper | A caliper, bone caliper and tape in one bag | Innovare caliper plus 164 mm bone caliper and 2 m tape | View |
The 5 Best Body Fat Caliper Picks, Reviewed
Skinfold calipers pinch a fold of skin and fat between two jaws, then read its thickness in millimeters. First, this guide covers true skinfold calipers, not digital calipers for machined parts or jewelry. In addition, each pick below lists only specs that we found on a retailer page, a maker page or a published review.
Best Overall
1. Slim Guide Skinfold Caliper
Best for: lifters, coaches and home users who will measure the same sites every few weeks and want a durable caliper with a clear scale.
The Slim Guide is the best all-round body fat caliper here because it combines a wide range with a constant jaw pressure. For example, a retailer page lists a jaw opening of up to 80 mm and spring-loaded arms that apply a constant 10 g per square millimeter. In addition, the 2023 Cambridge review of caliper types lists the Slim Guide as an ABS plastic caliper with a 0.5 mm resolution and a 0 to 80 mm range.
It also comes with a 22-page instruction booklet, according to the retailer page. However, another seller page says it carries a lifetime manufacturer warranty and calls it a widely used professional caliper. Those are seller claims, so treat them as such.
- Range: 0 to 80 mm, 0.5 mm resolution, per the Cambridge review
- Constant jaw pressure of 10 g per square mm, per the retailer
- Body: ABS plastic with a high-tension spring
- 22-page instruction booklet included, per the retailer
- Calibration check limit of 40 mm, per the Cambridge review
Pros
- Wide range for larger skinfolds
- Constant, published jaw pressure
- Light, durable plastic body
- Clear booklet for beginners
Cons
- The scale needs a steady eye to read to 0.5 mm
- Plastic can wear with heavy use
- No body fat chart or calculator is built in
Skip it if: you want a metal caliper with a dial; the Lange below is built that way.
Best Budget Plastic
2. Sequoia Fitness TrimCal 4000 Body Fat Caliper
Best for: home users who want a Slim Guide style caliper with a chart and instructions in the box.
Overall, the TrimCal 4000 is a plastic caliper for home use. For example, a retailer page lists ABS plastic, a skinfold range up to 80 mm (3.15 in.) and a dual-spring mechanism that applies consistent jaw pressure. Also, it has a pistol grip for one-handed use and needs no battery or app.
In addition, the box includes a body fat chart for men and women and step-by-step instructions. However, the retailer page does not state the resolution and gives no test data for this model. Finally, a body measuring tape is not included.
- ABS plastic, per the retailer page
- Range: up to 80 mm (3.15 in.), per the retailer page
- Dual-spring mechanism for consistent jaw pressure
- Pistol grip; no battery or app needed
- Body fat chart and instructions included
Pros
- Wide 80 mm range
- No batteries or app
- Chart and instructions in the box
- Low cost
Cons
- Resolution and jaw pressure are not published
- No test data for this model
- Reviewers describe the frame as large
Skip it if: you want a published jaw pressure; the Slim Guide and Lange both list 10 g per square mm.
Best Metal Caliper
3. Seko USA Lange Skinfold Caliper With Case
Best for: trainers and serious hobbyists who want a metal caliper with a dial and a long research history.
Overall, the Lange is the classic metal skinfold caliper. For example, TopEndSports lists a 60 mm range, constant 10 g per square mm jaw pressure and a stated accuracy of plus or minus 1 mm. In addition, the Cambridge review describes it as aluminium with hinged jaws of about 30 mm2 and a gear-driven dial with 1.0 mm resolution.
TopEndSports also says the caliper should be calibrated regularly, and it notes that a separate calibration block is sold for it. Finally, the Cambridge review adds that the Lange needs about a third of the opening force of the Harpenden and Slim Guide. Also, this Amazon listing is sold by Seko USA and includes a case.
- Range: 0 to 60 mm; dial resolution 1.0 mm, per the Cambridge review
- Accuracy: plus or minus 1 mm, per TopEndSports
- Constant jaw pressure of 10 g per square mm
- Hinged jaws of about 30 mm2
- Case included; calibration block sold separately, per TopEndSports
Pros
- Metal build with a dial
- Long history in research and fitness testing
- Lower opening force than the plastic calipers
- Case for storage
Cons
- 1.0 mm resolution is coarser than the Slim Guide
- 60 mm range is smaller than the plastic calipers
- Needs periodic calibration checks and a separate block
Skip it if: you want the widest jaw opening or a low price; the plastic calipers open to 80 mm and cost less.
Best Pro Caliper
4. Harpenden Skinfold Caliper With BodyTracker Software
Best for: clinicians, coaches and committed hobbyists who want the caliper that research papers often use, plus software to log results.
First, the Harpenden is the reference design in much of the skinfold literature. For example, the Cambridge review describes it as a carbon steel caliper with a 0 to 80 mm range, fixed jaws of 90 mm2 and a dial with 0.2 mm resolution. In addition, a retailer page for this bundle lists the same 0 to 80 mm range and 0.2 mm dial graduation, plus a constant 10 g per square mm pressure.
The bundle also includes BodyTracker, a Windows software CD. Next, TopEndSports says it supports Jackson and Pollock 3-, 4- and 7-site methods, the Durnin and Womersley method, and tracking of tape measurements. However, the same review warns that calipers are not interchangeable, and one comparison found the Harpenden underestimated body fat by 11.8 percent versus the Lange with one equation.
- Range: 0 to 80 mm; dial graduation 0.2 mm, per the retailer page
- Constant jaw pressure of 10 g per square mm
- Steel construction, supplied with a case, per the retailer
- BodyTracker software on CD for Windows
- Supports Jackson and Pollock and Durnin and Womersley methods, per TopEndSports
Pros
- Finest dial resolution here at 0.2 mm
- Wide 80 mm range
- Constant, published jaw pressure
- Software for logging and formulas
Cons
- Costs far more than the plastic calipers
- Software is a Windows-only CD
- Readings do not match other caliper models, per the Cambridge review
Skip it if: you only need a trend marker at home; a Slim Guide or TrimCal costs far less.
Best Kit for Trainers
5. Cescorf Level 1 Anthropometry Kit With Skinfold Caliper
Best for: personal trainers and students who also take girth and bone-width measurements.
First, this Cescorf kit goes beyond a single caliper. For example, a retailer page lists the Innovare skinfold caliper in ABS plastic, a small bone anthropometer with a 164 mm range, a 2 m non-stretch flexible steel anthropometric tape and a transport bag. Also, the page says a metal spring applies constant pressure through the whole range.
Meanwhile, Cescorf is a Brazilian maker, and another page says the Innovare is certified by ANVISA, Brazil’s regulator, for measuring equipment. The Cambridge review says a Cescorf generic Harpenden-type caliper has been reported as reliable since 1994, but it also warns that calipers are not interchangeable. However, the Innovare’s own range, resolution and jaw pressure are not published on the pages we found.
- Innovare skinfold caliper, ABS plastic
- Small bone caliper, 164 mm range
- Anthropometric tape, 2 m, non-stretch steel blade
- Transport bag included
- Numeric caliper range, resolution and jaw pressure not published on the pages we opened
Pros
- Caliper, bone caliper and tape in one set
- Useful for girth and bone-width work
- Compact bag keeps parts together
- Spring designed for constant pressure
Cons
- Skinfold caliper specs are not published
- More than a casual home user needs
- Brazilian-market documentation may be less detailed
Skip it if: you only want a skinfold caliper for yourself; the Slim Guide costs less to learn on.
How We Chose the Best Body Fat Caliper
To be clear, we did not test these calipers by hand. Instead, we compared listings, maker pages and published research, then kept calipers with a clear design and a stated purpose. In addition, we dropped any spec that we could not find on a page we opened.
- Design and pressure: constant jaw pressure of about 10 g per square mm is the usual research standard.
- Range and scale: enough jaw opening for larger skinfolds and a scale that is easy to read.
- Calibration: a way to check the reading against a known size.
- Documentation: instructions, charts or software for turning millimeters into an estimate.
- Sources: we used a 2023 Cambridge review of skinfold calipers, TopEndSports and a study on tester experience.
However, we found no branded digital skinfold caliper on Amazon with specs we could verify. Therefore, this list has five picks rather than eight, and it leaves out unbranded digital listings.
Best Body Fat Caliper Types: Plastic vs Metal Calipers
First, the three well-known designs differ in jaw size, resolution and range. Also, the table uses figures from the Cambridge review. For example, the Harpenden is a lab-grade caliper that costs far more than the others, so it is our premium pick.
| Type | Body | Range | Resolution | Jaw area |
|---|---|---|---|---|
| Harpenden | Carbon steel | 0 to 80 mm | 0.2 mm | 90 mm2 |
| Lange | Aluminium | 0 to 60 mm | 1.0 mm | 30 mm2 |
| Slim Guide | ABS plastic | 0 to 80 mm | 0.5 mm | 91 mm2 |
Moreover, the same review says calipers are not interchangeable. However, in one comparison, the Harpenden underestimated body fat by 11.8 percent relative to the Lange with one prediction model. As a result, pick one caliper and stay with it, and do not compare your numbers with a friend who uses another model.
This guide is about the human body, so if you need a caliper for machined parts or gems, see our best digital caliper and best jewelry caliper guides instead.
What Skinfold Readings Really Show: An Estimate, Not a Measurement
First, a skinfold caliper measures the thickness of a fold of skin and fat at one spot. In fact, it does not measure body fat directly. Instead, you add several folds, put the sum into an equation and get an estimate of body density, then body fat percentage.
However, the error can be large. For instance, a 2023 study of young athletes compared skinfold equations with a three-compartment criterion. Also, the Jackson and Pollock 3-site equation had a standard error of 2.21 kg for fat-free mass in females, and one equation for males had 3.79 kg. Tester skill also matters. For example, in a Western Kentucky University study of 78 adults, an experienced tester and a novice using the same Lange caliper differed significantly, with average readings of 23.9 and 22.8 percent. In short, treat a caliper number as a trend marker, not a diagnosis.
Overall, if you only want a trend, calipers can work well. In practice, three habits help most. First, use the same caliper every time. Then mark your sites. Finally, measure at a consistent time of day. However, if you need a medical assessment, ask a clinician. Finally, for related tools, see our best fitness scale guide, the best body measuring tape guide and our explainer on how skinfold calipers measure body composition.
How to Take Skinfold Readings in Six Steps
In fact, good technique matters more than the brand. First, follow these steps for a repeatable reading. Then log the same sites each time.
- Pick a consistent time. Measure at the same time of day, ideally before exercise and after a normal meal.
- Mark the site. Use a pen or marker so you pinch the same spot each session.
- Pinch the fold. Grasp the skin and fat between thumb and finger, about 1 cm (0.4 in.) from the mark, and pull it away from the muscle.
- Place the jaws. Set the caliper tips at the mark with the fold still held.
- Read after about three seconds. The Cambridge review suggests reading around the third second of compression.
- Repeat and average. Take two or three readings at each site and use the median or average.
Jackson and Pollock Formula: Worked Examples
First, the Jackson and Pollock 3-site equations are the most common starting point. Also, TopEndSports lists them. For men, the sites are chest, abdomen and thigh. In contrast, for women, the sites are triceps, thigh and suprailiac. S is the sum of the three folds in millimeters.
| Group | Body density equation |
|---|---|
| Men (chest, abdomen, thigh) | 1.10938 – 0.0008267 x S + 0.0000016 x S2 – 0.0002574 x age |
| Women (triceps, thigh, suprailiac) | 1.0994921 – 0.0009929 x S + 0.0000023 x S2 – 0.0001392 x age |
Next, convert density to body fat percent with the Siri equation: body fat percent = 495 divided by density, minus 450.
- Man, age 30: chest 10 mm, abdomen 20 mm, thigh 15 mm, so S is 45 mm. Density is 1.0677 g/cm3 and body fat is about 13.6 percent.
- Woman, age 35: triceps 18 mm, suprailiac 20 mm, thigh 22 mm, so S is 60 mm. Density is 1.0433 g/cm3 and body fat is about 24.4 percent.
To be clear, these are made-up examples to show the arithmetic, not typical values. Also, a different equation or caliper can give a different answer for the same person.
Calibration, Care and Honest Limits of Your Caliper
In practice, a caliper drifts if its spring weakens or its jaws get bent. Therefore, check it against a known size before each use. A calibration block or dowel is the easiest way. The Cambridge review recommends servicing the pivot, springs, jaws and dial each year, and replacing springs when they lose force.
Also, keep the caliper dry and out of a hot car, and store it in its case. Meanwhile, be aware of the limits. For example, skinfolds measure fat under the skin only, and thick folds are hard to pinch. Overall, neither a caliper nor a scale can diagnose a health condition. If body fat matters for medical reasons, ask a doctor about methods such as DXA.
Best Body Fat Caliper FAQ
What is the best body fat caliper for most people?
The Slim Guide is the best body fat caliper for most people. It has a 0 to 80 mm range and a constant 10 g per square mm spring pressure, and it comes with an instruction booklet. For example, it works well for home and gym tracking.
What is the best body fat caliper for beginners?
The TrimCal 4000 is a low-cost option for beginners. It has an 80 mm range and a dual-spring mechanism, and a chart and instructions come in the box. However, the retailer page does not publish its resolution, so the Slim Guide is the better-documented choice.
Are body fat calipers accurate?
In short, any caliper gives an estimate. A 2023 study found standard errors of 2.21 kg of fat-free mass with a 3-site equation in female athletes. As a result, use a caliper to track changes, not to get an exact number.
Is a skinfold caliper better than a smart scale?
Neither is exact. A caliper depends on tester skill and the equation, and a scale depends on its electrical method. In contrast to a scale, a caliper needs practice. Pick one and use it the same way each time.
How often should I take skinfold readings?
Every two to four weeks is enough for most people. Also, measure at the same time of day and mark your sites. Instead, daily readings mostly show noise.
Can I use a skinfold caliper on myself?
Yes, for sites you can reach, such as the thigh, suprailiac area and abdomen. However, sites such as the back are easier with a helper. Tester skill changes readings, so practice on the same sites.
Which sites do I measure with a skinfold caliper?
For the 3-site Jackson and Pollock equation, men use chest, abdomen and thigh, and women use triceps, thigh and suprailiac. In short, stick to one set of sites and one equation.
Do I need to calibrate a skinfold caliper?
Yes, regularly. TopEndSports says the Lange should be calibrated regularly, and the Cambridge review recommends servicing a caliper every year. For example, check against a known size before each session.
What is the difference between a skinfold caliper and a digital caliper?
A skinfold caliper has spring-loaded jaws that press with a set force on skin and fat. A digital caliper for parts or jewelry has no such spring. Therefore, do not use a machinist caliper to measure body fat.
How do I turn caliper millimeters into body fat percent?
Add your site readings, put the sum into an equation such as Jackson and Pollock for body density, then use the Siri equation: 495 divided by density, minus 450. Alternatively, use the chart that comes with a beginner caliper.
Bottom Line on the Best Body Fat Caliper
For most people, the best body fat caliper is the Slim Guide. Overall, it has an 80 mm range, constant spring pressure and a clear booklet. Choose the TrimCal 4000 on a tight budget, the Lange or Harpenden for a metal dial, or the Cescorf kit if you also need a tape and a bone caliper. Whatever you buy, measure the same sites in the same way and read the result as an estimate.