Spanx Sizing Guide UK: How to Find Your Perfect Fit and What’s Worth Buying

Spanx has redefined modern shapewear and activewear by making confidence and comfort its priority. Whether you’re shopping for the classic shaping shorts, faux leather leggings, or their expanding line of bras and bodysuits, one thing is clear—getting the right size is crucial for Spanx to do its job.

At Tellar.co.uk, we help you find your perfect fit in Spanx (and 1,500+ other brands) using your body measurements—not unreliable size charts or guesswork.

This guide will walk you through everything you need to know about Spanx sizing in the UK and what to buy based on your body type and wardrobe goals.

Why Spanx Sizing Can Be Tricky

Despite their reputation for inclusivity, Spanx garments can fit differently depending on the product range—particularly between shapewear, leggings, and their expanding range of outerwear.

Common Sizing Challenges with Spanx:

Compression levels vary between products—medium vs. firm vs. ultra-firm hold
Their US-based size chart may not match standard UK sizing
Leggings and shapewear may feel tight initially but are designed to contour
Many products are intended to be pulled on without fastenings, requiring an exact fit at the waist and hips

🔗 Learn why size charts aren’t always accurate

How Tellar.co.uk Makes Spanx Sizing Easy

Rather than guessing your size based on reviews or brand charts, use Tellar.co.uk’s free sizing tool to instantly find your ideal Spanx size.

🛠 Step-by-Step:

Create your free profile using your chest, waist, and hip measurements.
Or select your known size in another brand (like Marks & Spencer, Skims, or Sweaty Betty) to estimate your Spanx size.
Visit our store size lookup tool and search “Spanx.”
We’ll instantly return your best size in Spanx, based on your largest measurement to ensure the correct compression.

🪡 No tape measure? Request your free measuring tape from Tellar today.

Spanx UK: Size Conversion Overview

Spanx uses US sizing by default, which often leads to confusion for UK shoppers. Here's a quick breakdown:

UK Size	US Spanx Size
6	XS
8	S
10	M
12	L
14	XL
16-18	1X
20-22	2X

However, these sizes are only guidelines. Compression fit requires more precision—which is why we recommend using Tellar’s data-backed recommendation engine.

🔗 How to measure yourself properly

What Spanx Products Are Worth Buying?

Spanx offers more than just shapewear today. Here’s what users consistently rave about:

1. Faux Leather Leggings

Arguably their most iconic product, these leggings combine style and structure.

Best for: Curvy, hourglass, or athletic builds.

Fit note: Size up if you’re between sizes—tight waistbands can feel constrictive.

2. OnCore Firm Control Shapewear

The gold standard in body-smoothing. Ideal for special occasions or tight dresses.

Best for: Formal wear, postnatal shaping, or bodycon clothing.

3. Spanx Bra-llelujah! Range

Seamless bras that smooth back bulges and feel like a second skin.

Best for: Everyday wear, especially under T-shirts and knits.

4. Shaping Bodysuits

From thong-back to full coverage, Spanx bodysuits create clean lines.

Best for: Streamlining full-body outfits.

5. AirEssentials Loungewear

A newer line of breathable, cloud-soft separates perfect for travel.

Best for: Tall frames, loungewear lovers, and long-haul comfort.

Tips for Buying Spanx Online (Without the Return Hassle)

✅ Tip 1: Know Your Largest Area

Spanx size recommendations should be based on your largest measurement—whether that’s hips, waist, or chest.

✅ Tip 2: Consider Compression Level

Medium compression is ideal for all-day wear.
Firm compression is best for smoothing or sculpting.
Ultra-firm should only be worn short-term and fitted precisely.

✅ Tip 3: Don't Trust Labels Alone

You might be a UK 12, but depending on fabric stretch, your best Spanx size could be Large or even XL.

Use Tellar’s Store Size Lookup to be sure.

Why Use Tellar Instead of Guessing?

Without Tellar	With Tellar
Guess size from reviews	Get exact brand-specific sizing
Rely on vague charts	Use your real body data
Multiple orders = returns	One accurate order first time
Confused about compression	Get matched to comfort level

✨ Find your Spanx size now

Tellar.co.uk: Your Sizing Companion for Spanx and Beyond

Tellar.co.uk isn’t a retailer—we’re a free, independent sizing platform designed to help you shop smarter across over 1,500 brands.

We’re not here to sell you more—we’re here to help you buy better.

✔️ Free measuring tape

✔️ 100% independent, affiliate-free sizing advice

✔️ Tailored to your body, not generic sizes

✔️ Get started in seconds—no download required

📌 About Tellar

🔐 Login to your sizing profile

What Users Say

“Spanx leggings were always too tight at the waist until I used Tellar. Now I get it right every time.” – Jade, Bristol
“Tellar told me I needed a 1X, even though I’m a UK 14. It sounded big—but fit like a dream.” – Leanne, Leeds

Follow Tellar.co.uk for More Sizing Insights

📣 Don’t forget to bookmark https://www.tellar.co.uk for all your sizing needs.

Final CTA: Ready to Find Your Spanx Size?

Don't leave Spanx sizing to chance. Whether you're buying shapewear, activewear or their famous leggings—let Tellar.co.uk guide you to the perfect fit.

🔗 Create your free sizing profile

🔗 Check Spanx sizing in seconds

🎁 Order your free measuring tape

Tellar.co.uk – Find your size in 1,500+ brands real-time. It’s free & easy.