Where Can I Buy Adjustable Dumbbells Online in the UK?

A Complete UK Guide to Choosing, Comparing, and Buying Adjustable Dumbbells

If you train at home or you’re building a compact home gym, adjustable dumbbells instantly become one of the most valuable pieces of kit you can own. They replace an entire rack of dumbbells without taking up the space, money, or mess. Whether you’re targeting strength, hypertrophy, conditioning, or general fitness, a good adjustable dumbbell set gives you flexibility without forcing you to buy individual dumbbells 2kg, dumbbells 3kg, dumbbells 4kg, dumbbells 5kg pair, dumbbells 6kg, dumbbells 8kg, dumbbells 20kg set, dumbbells 40kg or even dumbbells 50kg separately. With one purchase, you cover everything.

But the real question is this: where can you buy the best adjustable dumbbells online in the UK, without overpaying or getting low-quality, shaky gear?

With thousands of listings, dozens of brands, and a huge range of build quality, shoppers in the UK often end up confused. Add in the rise of home gyms, TikTok viral workouts, and Instagram fitness content, and suddenly every brand claims to have the “best” adjustable dumbbells UK lifters need.

This guide cuts through all of that. You’ll learn where to buy them, which brands are trustworthy, what weight ranges are realistic, the pros and cons of each buying option, and how to choose the right dumbbells for your training goals.

This guide is based on real UK training experience and informed by publicly available information from established retailers, helping ensure accuracy when comparing adjustable dumbbells and free-weight options.

Let’s break down the landscape of buying adjustable dumbbells online in the UK — intelligently, practically, and without marketing fluff.

 

What Makes Adjustable Dumbbells Worth Buying?

Before we dive into the retailers, it’s worth understanding why adjustable dumbbells are so popular. The biggest reason is simple: they save space and money. Instead of buying dumbbells 2kg, dumbbells 4kg pair, dumbbells 8kg, dumbbells metal sets, and a whole tree of individual weights, one pair handles all of it.

Adjustable dumbbells now come in multiple styles:

 

• Spinlock adjustable dumbbell set

• Selectorised adjustable dumbbells (dial or click-lock)

• Hybrid dumbbells (quick-pin adjustments)

• Adjustable dumbbells 24kg, 40kg, and adjustable dumbbells 50kg models for heavy lifters

 

No matter your experience level — beginner, intermediate or advanced — you can build a full dumbbells home gym setup around a single pair of adjustable weights.

 

Where to Buy Adjustable Dumbbells Online in the UK

The UK market has become saturated with cheap imports, high-end options, and everything in between. Below are the most reliable and reputable places to buy dumbbells UK lifters consistently trust. These represent the best balance of quality, price, and customer protection.

 

1. Decathlon UK

Decathlon UK remains one of the most dependable places to buy adjustable dumbbells online. They stock everything from 2kg dumbbells, 3kg dumbbells, 4kg dumbbells, and 5kg pairs to adjustable dumbbells 30kg and full dumbbells set UK packages. They offer clear return policies, stores across the UK, and transparent product reviews.

Decathlon is especially good for beginners or those looking for budget-friendly adjustable dumbbell set options while still getting decent build quality. If you’re building a home gym on a smaller budget, they are one of the best places to start.

 

2. Mirafit

Mirafit is arguably the most respected UK home gym equipment brand. Their adjustable dumbbells UK range is known for durability, metal construction, and the kind of reliability that heavy lifters demand. If you’re training with heavier weights — adjustable dumbbells 30kg, adjustable dumbbells 40kg or adjustable dumbbells 50kg — Mirafit often leads the pack.

Strength athletes, PTs, and garage gym owners consistently rate them highly. They offer both spinlock and plate-loaded handles, making them ideal for progressive overload training at home without needing a full rack.

 

3. Amazon UK

Amazon isn’t a brand — it’s a marketplace — but it’s still one of the easiest places to find anything from a dumbbells tree to full dumbbells 50kg adjustable sets. The benefit is speed, a wide range of price points, and thousands of customer reviews.

The downside is quality inconsistency. Some brands are excellent; others should be avoided. When buying adjustable dumbbells on Amazon UK, always check:

 

• Verified buyer reviews

• Warranty or return policy

• Construction material (metal dumbbells are usually more durable)

• Plate fit and lock-in security

 

Still, it’s often the most convenient option for fast delivery.

 

4. Argos

Argos is still a favourite for casual home gym purchases. They sell individual weights — dumbbells 2kg, dumbbells 3kg, dumbbells 4kg pair — and a few adjustable dumbbells UK kits, usually spinlock. If you want something inexpensive and available for same-day collection, Argos is ideal.

Their sets are often lighter (e.g., a dumbbells 20kg set rather than heavy-load adjustable dumbbells 40kg), so advanced lifters may outgrow them quickly.

 

5. Sports Direct

Sports Direct carries a range of fitness brands and often offers good value, especially on dumbbells 2kg to dumbbells 8kg. Their adjustable dumbbells range varies by store, but they can be a decent mid-range choice for simple home workouts.

 

6. Fittux

Fittux already sells adjustable dumbbells 24kg, adjustable dumbbells 30kg, and will eventually expand into heavier versions. What makes buying from Fittux different is that customers get:

 

• Free UK-based shipping and support

• Home gym equipment paired with gymwear and accessories

• Strong product imagery and accurate specs

• A fitness-led brand rather than a general retailer

 

For customers who want all their gym essentials in one place — oversized tees, joggers, training accessories, and dumbbells home gym equipment — Fittux offers a cleaner, more focused shopping experience.

 

Types of Adjustable Dumbbells: Which Should You Buy?

Now that we’ve covered the retailers, it’s important to know what you’re actually buying. Adjustable dumbbells come in multiple forms, and choosing the right one depends on your training style, space, and goals.

 

Spinlock Adjustable Dumbbells

These are the classic type many UK lifters grew up with. They use threaded ends and screw-on collars to hold plates in place. Benefits include:

 

• Affordable

• Durable

• Fully adjustable

• Compatible with standard weight plates

 

They’re ideal if you want a simple dumbbells set UK beginners or intermediates can rely on.

 

Selectorised Adjustable Dumbbells

These are the modern style — dial, click, or lever-based systems. They allow extremely fast weight changes and often replace an entire dumbbells tree.

Benefits:

• Fast transitions

• Space-saving

• Clean design

 

These are ideal for HIIT circuits, functional training, or high-volume sessions where constant weight changes are needed.

 

Loadable Metal Dumbbells

These are premium-level dumbbells metal lifters prefer. They often come in adjustable dumbbells 40kg or adjustable dumbbells 50kg configurations. Heavy lifters and strength-focused home gym owners love these because:

 

• They handle high loads

• They feel like commercial dumbbells

• They’re stable and balanced

 

Which Weight Range Should You Choose?

If you’re unsure what to buy, these general guidelines help:

 

Beginners:

Dumbbells 2kg, dumbbells 3kg, dumbbells 4kg pair

Dumbbells 8kg for progression

Adjustable dumbbells 20kg set for long-term growth

Intermediate lifters:

Adjustable dumbbells 30kg

Dumbbells metal sets

Adjustable sets that reach 32kg or higher

Advanced lifters:

Adjustable dumbbells 40kg

Adjustable dumbbells 50 kg

Loadable dumbbell handles with steel plates

 

Why Adjustable Dumbbells Matter for Home Gyms

A good pair of adjustable dumbbells replaces:

 

• A dumbbells tree

• Multiple dumbbells sets

• Expensive fixed-weight purchases

 

You can perform hundreds of exercises:

 

• Rows

• Chest press

• Shoulder press

• Goblet squats

• Lunges

• Romanian deadlifts

• Tricep extensions

• Biceps curls

• Farmers carries

• Overhead holds

 

For the UK fitness lifestyle where space is tight, adjustable dumbbells UK models are simply practical. Flats, shared houses, converted loft gyms, and garden sheds all benefit from compact equipment.

 

How to Choose the Right Adjustable Dumbbells Online

Since “best” depends on your training, here’s what most UK lifters should look for:

1. Weight Range

Buy heavier than you think you need. You will progress faster than expected.

2. Build Quality

Metal beats plastic.

Steel beats composite.

Always avoid hollow-core plates.

3. Grip

Knurled steel handles feel closest to commercial gyms.

4. Locking Mechanism

Fast-adjustment dials are convenient but can be fragile.

Spinlocks are slower but almost indestructible.

5. Warranty and Returns

UK-based support matters. Cheap imports rarely offer it.

 

Where You Should Buy Your Adjustable Dumbbells

If you want the safest, most reliable options, start with:

Decathlon UK — best entry-to-intermediate level

Mirafit — best for heavy and long-term use

Amazon UK — best for variety (but check reviews carefully)

Argos — best for convenience and same-day collection

Fittux — best for curated, affordable fitness-focused home gym essentials

 

Realistic Budgeting: How Much Should You Spend?

Price varies by weight range:

 

• Light sets (2kg–8kg): £5–£25

• Adjustable dumbbells 20kg set: £40–£80

• Adjustable dumbbells 30kg: £60–£120

• Adjustable dumbbells 40kg: £120–£200

• Adjustable dumbbells 50kg & above: £200–£350

 

High-end selectorised dumbbells can exceed £400, but you’re paying for speed and convenience, not necessarily durability.

 

Where this leaves you

Adjustable dumbbells have become a cornerstone of the modern home gym in the UK. They’re versatile, space-efficient, and cost-effective compared to buying a full dumbbells set UK consumers used to rely on. Whether you’re looking for dumbbells 2kg, dumbbells 3kg, dumbbells metal sets, adjustable dumbbells 30kg, or adjustable dumbbells 50 kg heavy-duty loads, the UK market has matured to offer options for every level of training.

Choose a retailer that fits your budget, choose a weight range that supports your progression, and choose construction that matches how seriously you train. For many lifters, adjustable dumbbells are the single purchase that transforms their home workouts from “good enough” to genuinely effective.

 

If you need training gear, adjustable dumbbells, or home gym essentials built for real life and real lifting, you’ll find them on the Fittux homepage — curated, reliable, and made for people who actually train.

 

If you want help sticking to your goals, this guide on staying accountable with your fitness goals will help