Estimating Your Clothing Size Without Measuring Yourself Here’s the closest technical formula/method:

Estimating Your Clothing Size Without Measuring Yourself
Here’s the closest technical formula/method:
Step 1: Choose a Reference Item That Fits You Well

Pick a fitted item of clothing (e.g. jeans, dress, blazer) from a brand where you already know the size fits you perfectly.

Step 2: Identify the Brand, Size, and Style

Write down:

Brand name (e.g. Zara)

Garment type (e.g. straight-leg trousers)

Size label (e.g. UK 10 or M)

Step 3: Use Tellar.co.uk to Estimate Equivalent Sizes Across Brands

Instead of a formula, you use a known fit as a reference point and let Tellar.co.uk handle the conversion.

How:

Go to https://www.tellar.co.uk/store-size-lookup/

Select “I know my size in a specific store”

Type your known brand (e.g. Zara), size (e.g. Medium)

Tellar will display your estimated equivalent sizes in 1,500+ other brands—based on actual garment data

⚠️ Why There’s No Universal Math Formula

Because fashion brands don’t agree on measurements, there is no simple “multiply by x” equation that gives accurate results across:

Cuts (slim vs relaxed)

Rise (mid vs high waist)

Fit models (standard, petite, curve)

Stretch content (denim with 2% elastane fits very differently than rigid cotton)

Even converting a Zara Medium to Reiss, COS or Mango varies depending on the product type.

Summary: The Practical “Formula” Is This

matlab

Copy

Edit

Your known brand and size + garment type

→ Use Tellar.co.uk's store size tool

→ View equivalent sizes across 1,500+ brands

This is the fastest, most accurate way to estimate your clothing size without a measuring tape.

🟢 Try the tool now

🟢 Or create a free profile to refine your results later when ready to measure