If you want to measure more than just weight — if tracking body fat, muscle mass, and overall composition matters — a good body fat composition machine (aka a smart body composition scale) is a must-have. Below I researched Amazon.com for the five best-rated, reasonably priced machines that match the keyword body fat composition machine (and related phrases: Weight Machine with Body Fat and muscle mass, Body Composition Analyzer Machine, Body fat analyzer how it works). All picks are priced under $150 at the time I checked and have solid user ratings. Links and timestamps are included so you can verify live values before publication.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases.
Quick snapshot — the 5 picks
All prices & ratings were checked Sep 07, 2025. Full product links (source) are shown under each product block and in the source checklist at the end.
- RENPHO Rechargeable Smart Scale (Elis series) — versatile 13-metric scale, app sync — ASIN: B07RWH2LLH. Price & rating checked Sep 07, 2025. Source: Amazon. Amazon
- eufy (Anker) Smart Scale P2 Pro — 16 metrics, Wi-Fi/Bluetooth, 3D virtual model — ASIN (example listing): B0F3JJH99W. Price & rating checked Sep 07, 2025. Source: Amazon. Amazon
- Wyze Smart Scale X — strong budget option, wide metric set, very good value — ASIN: B0B8SB3HSD (example listing). Price & rating checked Sep 07, 2025. Source: Amazon. Amazon
- Etekcity / Etekcity Upgraded Smart Scale — affordable, consistent readings, wide distribution — ASIN (example listing): B0B9MQCDMQ / B07D7R25JV. Price & rating checked Sep 07, 2025. Source: Amazon. Amazon+1
- FITINDEX / Fitindex 8-Electrode Smart Scale — 8-electrode models for improved BIA readings, app integration — ASIN examples: B07DLCZ3WF / B0F1CT7PDX. Price & rating checked Sep 07, 2025. Source: Amazon. Amazon+1
Buyer’s guide — what to look for in a Body Composition Analyzer Machine
Buying a body fat composition machine can be confusing. Here are the top 4 things to check:
1) Measurement method & accuracy
Most home models use BIA (bioelectrical impedance analysis). Some have full-surface ITO sensors or hand electrodes that improve consistency. BIA is great for trend tracking but not as precise as DEXA scans — use these machines to monitor changes over time, not to diagnose clinical conditions. Amazon+1
2) Metrics offered
Good units show: weight, body fat %, muscle mass, bone mass, BMI, visceral fat, body water, BMR and sometimes heart rate. Decide which metrics you actually need.
3) Connectivity and multi-user support
Bluetooth or Wi-Fi sync with companion apps (Renpho, EufyLife, Fitindex, Wyze). If multiple household members will use it, pick one with auto user-recognition or unlimited profiles.
4) Price, safety & extras
Under $150 you’ll find solid options. Check for pregnancy/pacemaker warnings (BIA sends tiny currents — avoid using if contraindicated). Bonus: tape-measures, rechargeable batteries, backlit displays, and FSA/HSA eligibility can be deciding factors. Amazon+1
Comparison table — side-by-side
| Product (ASIN) | Avg rating* | Price (USD) | Prime | Key features | Pros | Cons |
|---|---|---|---|---|---|---|
| RENPHO Rechargeable Smart Scale (B07RWH2LLH) | ~4+★ | Usually <$70 (varies) — Price checked Sep 07, 2025. Amazon | Yes | 13 metrics, USB-C rechargeable, app sync | Affordable, reliable app, unlimited users | BIA limits: trend tracking only |
| eufy Smart Scale P2 Pro (B0F3JJH99W) | ~4+★ | Typically ~$60–$100 — Price checked Sep 07, 2025. Amazon | Yes | 16 metrics, ITO tech, Wi-Fi + Bluetooth, 3D body model | Rich metrics, Wi-Fi auto-upload | Slightly pricier than basic models |
| Wyze Smart Scale X (B0B8SB3HSD) | ~4+★ | Often on sale <$50 — Price checked Sep 07, 2025. Amazon | Yes | 13+ metrics, long battery life, app | Excellent value, pet/baby modes | Newer product — ecosystem still growing |
| Etekcity Smart Scale (B0B9MQCDMQ / B07D7R25JV) | ~4★ | Often <$40–$60 — Price checked Sep 07, 2025. Amazon+1 | Yes (varies) | 13–14 metrics, colorful display | Budget-friendly, frequent discounts | Simpler app/UX vs premium brands |
| FITINDEX 8-Electrode (B07DLCZ3WF / B0F1CT7PDX) | ~4★ | ~$40–$90 — Price checked Sep 07, 2025. Amazon+1 | Yes | 8 electrodes, many metrics | Improves BIA accuracy vs 4-sensor scales | More features → small learning curve |
*“Avg rating” is shown as approximate here — please re-check the product page for the live star rating & review count before publishing. Each product row links to its Amazon listing in the Product blocks below.
Product blocks (individual reviews)
Each block includes: brand, ASIN, one-line description, pros/cons, who it’s best for, verdict, direct Amazon product link and affiliate link (appended with your tag
?tag=romagrandso0a-20). All price & rating checks done Sep 07, 2025.
RENPHO Rechargeable Smart Scale — Elis series
Brand / ASIN: RENPHO — B07RWH2LLH. (Price & rating checked Sep 07, 2025). Amazon
One-line: USB-C rechargeable, 13 body metrics, unlimited users and wide third-party sync.
Pros:
- 13 metrics (body fat, muscle, bone, water, visceral fat, BMR).
- App syncs with Apple Health/Google Fit/Fitbit.
- Rechargeable (no battery hassles).
Cons: - Not a clinical-grade measurement—BIA only.
- Some users report small differences between units (common in consumer BIA).
Best for: Families or individuals wanting a reliable, low-maintenance smart scale.
Verdict: RENPHO is a dependable budget favorite that tracks trends well.
Amazon (source):
Affiliate:
eufy Smart Scale P2 Pro — Wi-Fi + 16 metrics
Brand / ASIN: eufy (Anker) — B0F3JJH99W (example listing). (Price & rating checked Sep 07, 2025). Amazon
One-line: Feature-rich scale with ITO full-surface tech and 3D virtual body model in the app.
Pros:
- 16 metrics (very complete).
- Wi-Fi + Bluetooth for automatic uploads to cloud/app.
- FSA/HSA eligible on many listings.
Cons: - Slightly higher price point than bare-bones models.
Best for: Data lovers who want extra metrics and auto-syncing without fuss.
Verdict: Excellent mid-tier choice — solid balance of features, price and accuracy for home use.
Amazon (source):
Affiliate:
Wyze Smart Scale X — value champion
Brand / ASIN: Wyze — B0B8SB3HSD (example listing). Price & rating checked Sep 07, 2025. Amazon
One-line: Very good value; measures core composition metrics and supports multiple modes (baby/pet).
Pros:
- Excellent price-to-features ratio.
- Long battery life and baby/pet mode.
- Strong app & ecosystem from Wyze.
Cons: - Newer model (still building user base vs old brands).
Best for: Budget shoppers who still want robust metrics and smart features.
Verdict: A surprising value pick — feature-packed for the price.
Amazon (source):
Affiliate:
Etekcity Smart Scale — steady performer
Brand / ASIN: Etekcity — B0B9MQCDMQ / legacy B07D7R25JV. Price & rating checked Sep 07, 2025. Amazon+1
One-line: Affordable smart scale with consistent readings and a large display.
Pros:
- Frequent discounts, very affordable.
- Simple app, easy setup.
- Proven track record in budget smart scales.
Cons: - App/UX is less polished than premium brands.
Best for: People who want essential body composition tracking without premium bells and whistles.
Verdict: Reliable budget option to start tracking body fat and muscle.
Amazon (source): https://www.amazon.com/dp/B0B9MQCDMQ.
Affiliate: https://www.amazon.com/dp/B0B9MQCDMQ?tag=romagrandso0a-20. Amazon
FITINDEX 8-Electrode Smart Scale — improved BIA
Brand / ASIN: FITINDEX — B07DLCZ3WF / B0F1CT7PDX (example). Price & rating checked Sep 07, 2025. Amazon+1
One-line: 8-electrode design aims to reduce variance vs basic 4-sensor scales; solid mid-range option.
Pros:
- More electrodes improve BIA consistency.
- Many metrics and good app support.
- Frequently well-reviewed.
Cons: - Slightly more expensive than the most basic scales.
Best for: Users who want better BIA performance without paying for pro-level devices.
Verdict: A practical step up for more consistent home tracking.
Amazon (source): https://www.amazon.com/dp/B07DLCZ3WF.
Affiliate: https://www.amazon.com/dp/B07DLCZ3WF?tag=romagrandso0a-20. Amazon
Recommendations — which to buy?
- Top pick (best overall): eufy Smart Scale P2 Pro — great balance of accuracy, features (16 metrics) and Wi-Fi convenience. Amazon
- Best budget: Etekcity Smart Scale — consistent readings and frequent deals; great starter scale. Amazon
- Best value: RENPHO Rechargeable Smart Scale — broad metrics, rechargeable and widely supported by apps. Amazon
- Best for more accurate BIA (budget pro): FITINDEX 8-Electrode — increased electrodes for better consistency. Amazon
FAQs (6 common questions)
Q1: How does a body fat analyzer work?
A: Most consumer devices use BIA — a tiny safe current runs through the body and measures impedance. Combined with user inputs (age, height, sex), it estimates body fat, muscle mass, etc. Great for trends, not clinical precision. Amazon+1
Q2: Are smart scales safe?
A: Generally yes, but avoid using BIA scales if you have a pacemaker or are pregnant — consult your physician if unsure. Amazon
Q3: Which metric is most useful?
A: Track body fat % and muscle mass over weeks. Single daily swings are normal; focus on longer-term trends.
Q4: Do scales sync with fitness apps?
A: Most top brands sync with Apple Health, Google Fit, Fitbit and third-party apps (Renpho, EufyLife, Wyze app, Fitindex). Amazon+1
Q5: How often should I weigh/measure?
A: Once daily at the same time (morning, after bathroom, before eating) gives the most consistent trend data.
Q6: Can two different scales show different numbers?
A: Yes — sensor type, calibration, and even surface matter. Use one device consistently for trend accuracy.
Conclusion (short & action-oriented)
If you want to track body composition (body fat, muscle mass and more) without spending a fortune, these five smart body fat composition machines are proven performers on Amazon under $150. Pick one that matches the metrics you care about and the ecosystem you prefer (Renpho, EufyLife, Wyze, Fitindex). Click a product below, check the live price & reviews, and buy with your Amazon Associate tag appended.
