Clothing Size Calculators & Conversion Tools
Translate your body measurements or existing garment tags into honest, brand-verified sizing recommendations. No signups, no body-image judgments, and zero data tracking.
How Perfect Size Works in 3 Steps
Honest sizing recommendations grounded in manufacturer specifications.
Accurate Body Measurements
Use a flexible tailor's tape to measure natural waist, full hips, or foot length without pulling tight. Metric (cm) and imperial (inches) are supported.
Deterministic Brand Lookup
Your inputs are evaluated client-side against verified published tables (Levi's US, ASTM standards, Adidas). If waist and hips diverge, we flag the conflict.
Actionable Starting Size
Receive a suggested starting size, nearby alternatives, and guidance on fabric stretch, rise, or silhouette so you buy the right fit the first time.
Available Size Calculators & Converters
Source-grounded sizing engines with zero data tracking and deterministic calculations.
Women's Jeans Size Calculator
Find your W size and US numeric jeans size from waist and hip measurements or convert known W sizes. Grounded in Levi's US official specifications.
Women's Dress Size Calculator
Translate bust, waist, and hip measurements into standard US dress sizes (00–18 / XXS–XL) with silhouette-specific fit advice. Grounded in ASTM standards.
Shoe Size Converter
Compare US Men, US Women, UK, and EU footwear sizes and foot length in inches/cm. Uses verified Adidas official table with exact 1.0 offset.
Hat Size Calculator
Convert head circumference in inches and centimeters to US fitted hat sizes (6 3/4 to 8+). Planned for Phase 2 validation.
Bra & Sister Size Calculators
6-measurement bra volume algorithm and adjacent sister size converter with US/UK cup progressions. Planned for Phase 2 subject-expert review.
Why We Reject “Universal” Size Conversions
There is no legally mandated standard for women's jeans or clothing sizes. A size 28 in Levi's is cut differently from a size 28 in Madewell or Zara. Generic calculator sites that pretend one formula fits every brand mislead shoppers and increase returns.
Transparent Provenance
Every table on our site links directly to its source guide (e.g. Levi's US or Adidas) along with the exact date we audited the measurements.
Zero Measurement Logging
Your body measurements never leave your computer or phone. Calculations are computed in JavaScript right in your browser session.