BRAND SIZE CALCULATOR
Gap Size Guide & Calculator
Find your best Gap size using your body measurements. Choose a product category, region and unit system to estimate your closest size.
Calculate your size
Gap size calculator
This calculator is preselected to Gap. Enter the measurements you know and we’ll compare them with available Gap size chart data.
Choose what you’re shopping for
Brand, product and size label context.
Add your measurements
Your measurements are private and never saved.
Enter the measurements you know. More relevant measurements can improve your estimate.
See your best size
Enter your measurements to see your best size.
Add at least one relevant measurement. More measurements can improve your estimate.
Size recommendations are estimates, not guarantees. Always check the product size chart and return policy before buying. Clothing Size Calculator is independent and not affiliated with the listed brands unless stated otherwise.
How Gap sizing works
The calculator compares your measurements with available Gap size chart data for the selected product category and region. It then suggests the closest size and nearby alternatives.
Size recommendations are estimates because fit can vary by style, cut, fabric and product design. Always check the product page and return policy before buying.
Supported Gap size categories
Use this Gap size calculator for supported product types such as jeans, tops, shirts, dresses, jackets, trousers and shoes. Availability may vary by gender and region.
Gap size calculator FAQ
Quick answers for using this independent Gap size guide.
How do I estimate my Gap size?
Measure the body areas that matter for the product you want to buy, then enter those measurements into the calculator. For jeans, use waist, hips and inseam. For tops, shirts and jackets, use bust or chest, waist and sleeve or shoulder measurements where available.
Is this an official Gap size calculator?
No. Clothing Size Calculator is independent and is not affiliated with Gap unless stated otherwise. Results are estimates based on available size chart data.
Can I convert Gap sizes between UK, US and EU labels?
Where size labels are available, the calculator can compare UK, US, EU and international sizing systems.
Will this guarantee the right Gap size?
No. Product cuts, fabrics and fit preferences can vary. Use the result as a guide and check the product’s size chart before buying.
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