UMF, MGO, MGS and KFactor are the four main rating terms you’ll see when shopping for Manuka honey — and understanding them can make the difference between buying confidently and feeling unsure.
One jar may say UMF 10+, another MGO 400+, another MGS, and another KFactor 16.
At first glance, it can feel confusing — but once you understand how these systems work, choosing the right Manuka honey becomes much easier (and far more rewarding).
The key takeaway is simple:
Always compare like with like — and once you do, you can confidently choose a jar that fits your needs and budget.
Comparing Manuka honey rating systems and feeling lost? 🔎
Let’s break it down clearly so you can shop smarter — not harder.
UMF (Unique Mānuka Factor)UMF is one of the most trusted and widely recognised Manuka honey rating systems. It measures multiple key compounds including leptosperin, DHA, MGO and HMF. Because it looks at several markers, many buyers prefer UMF-certified honey for its broader quality assurance.
MGO (Methylglyoxal)MGO is a single, easy-to-understand number that tells you how much methylglyoxal is present. This makes it one of the simplest ways to compare strength across products — especially when browsing online or on Amazon.
MGS (Molan Gold Standard)MGS is a less common grading system linked to Dr Peter Molan’s research. It focuses mainly on methylglyoxal levels and is typically explained by individual brands.
KFactor (Wedderspoon)KFactor is a proprietary system used by Wedderspoon. It focuses more on pollen count and floral purity rather than just chemical markers. The brand has also begun transitioning toward MGO ratings, making comparisons easier for buyers.
👉 The good news?Once you understand these systems, you can quickly spot high-quality jars and avoid confusion — making your purchase decision much more straightforward.
How UMF, MGO, MGS and KFactor are different 🔢
Each system measures something slightly different — but that doesn’t mean one is “bad” and another is “good.”
Instead, think of them as different ways to describe quality and strength.
Here’s how to approach them when buying:
- UMF → Great for buyers who want a certified, multi-factor quality system
- MGO → Ideal for quick, clear strength comparison
- MGS → Useful when clearly explained by the brand
- KFactor → Best understood within Wedderspoon’s product range
This means:
UMF 10+ ≠ MGO 10+KFactor 16 ≠ UMF 16+MGO 400+ ≠ automatic UMF certification
But importantly — none of these are “wrong.” They simply require the right comparison.
👉 For most buyers, sticking to either UMF or MGO-labelled products makes shopping easier and more transparent.
UMF vs MGO vs MGS vs KFactor compared 📊
| Rating system | What it usually means | Best used for | What not to assume |
|---|---|---|---|
| UMF | Certified multi-factor Manuka honey rating system | Buyers wanting verified quality and traceability | Does not automatically mean organic or medical-grade |
| MGO | Methylglyoxal strength number | Quick comparison of potency across products | Not the same as full UMF certification |
| MGS | Molan Gold Standard grading system | Comparing clearly explained MGS-labelled products | Not identical to UMF |
| KFactor | Wedderspoon’s proprietary rating system | Comparing within Wedderspoon’s range | Not directly comparable to UMF or MGO |
| UMF 10+ | Mid-range certified Manuka honey | Everyday use and general wellness | Not equal to MGO 10+ |
| MGO 400+ | Higher methylglyoxal level | Stronger potency comparison | Does not guarantee UMF certification |
| KFactor 16 | Monofloral Manuka honey (Wedderspoon) | Understanding Wedderspoon labels | Not equivalent to UMF 16+ |
| No clear rating | No recognised strength system | Requires extra caution | Harder to compare quality |
What to check before comparing rating systems ✅
Before choosing your Manuka honey, take a quick moment to check a few key details — this helps ensure you’re getting real value for your money.
Start with:
- Which rating system is used (UMF, MGO, MGS or KFactor)
- Whether the honey is monofloral or multifloral
- Country of origin (New Zealand is the most regulated)
- Whether it’s batch tested and traceable
- Jar size and price per gram (important for value)
For exported New Zealand mānuka honey, the Ministry for Primary Industries requires testing against five attributes to confirm authenticity. This helps ensure that what you’re buying is genuine Manuka honey.
👉 This level of testing is one reason why many buyers prefer certified New Zealand Manuka honey — especially when purchasing online.
Also remember a basic safety rule: honey should not be given to babies under 12 months. For more guidance from health authorities, you can read more here.
Five rating-system situations where buyers get confused 📌
You compare UMF and MGO as if they are identical 🏷️
They’re related — but not identical.
UMF includes MGO as part of its broader testing, while MGO focuses on one compound. Both are useful — just compare within the same system for clarity.
👉 Tip: If you want simplicity, go MGO. If you want certification depth, go UMF.
You assume MGO-only honey is automatically worse 🔢
Not true.
Many high-quality Manuka honeys use MGO as their primary label — and it’s often the easiest way to compare strength quickly.
👉 In fact, many popular Amazon bestsellers use MGO ratings because they’re clear and easy to understand.
You assume MGS is the same as UMF 🍯
MGS is different and less widely used.
That doesn’t mean it’s bad — just make sure the brand clearly explains what the rating means before buying.
You assume KFactor 16 means UMF 16+ 🌿
KFactor is brand-specific.
Wedderspoon has begun transitioning to MGO ratings, which makes comparisons easier — but older KFactor labels should be interpreted within that brand’s system.
You treat any high rating as medical-grade honey ⚠️
Even high-rated Manuka honey is still a food product.
It can be enjoyed as part of a healthy lifestyle, but it should not replace medical treatments. Always consult a healthcare professional for medical concerns.
FAQs about UMF, MGO, MGS and KFactor ❓
Which Manuka honey rating system is easiest to understand?
MGO is usually the easiest because it gives a single number. It’s ideal for quick comparisons when browsing multiple products.
Is UMF better than MGO?
UMF provides a broader certification system, while MGO offers simplicity. Many buyers choose based on preference — both can represent high-quality Manuka honey.
Is MGS the same as MGO?
No. MGS is a grading system often linked to methylglyoxal levels, while MGO is the actual compound measurement.
Is KFactor the same as UMF?
No. KFactor is brand-specific, while UMF is a recognised certification system.
Which rating system should I choose?
For most buyers:
- Choose UMF if you want certification and traceability
- Choose MGO if you want simple, clear strength comparison
Both are excellent starting points when buying Manuka honey online.
Final thoughts: compare the system before comparing the number ✅
UMF, MGO, MGS and KFactor all serve a purpose — and once you understand them, choosing Manuka honey becomes much easier.
Instead of feeling overwhelmed, you can now:
- Identify the rating system
- Compare similar products
- Choose a jar that fits your needs and budget
👉 The result? A more confident purchase — and a better chance of enjoying the full benefits of Manuka honey.
For beginners, remember:
Stick to recognised systems like UMF or MGO, compare within the same scale, and choose a trusted brand.
Related posts if you’re comparing Manuka honey rating systems 📚
Compare Manuka honey rating systems side by side 🏷️
Use the main table to compare food-grade Manuka honey products by rating system, MGO, UMF, MGS, KFactor, country, monofloral status, raw status, organic status, UMF certification, MGO testing, batch testing, traceability and brand details.
👉 This is the easiest way to quickly spot high-quality options and find the best value for your budget.