Converting Cooking Measurements, Clothing Sizes, and Shoe Sizes
How cup-to-tablespoon conversions and international clothing/shoe size conversions work, with real examples.
Cooking measurements and clothing/shoe sizes are everyday conversions that, unlike scientific units, are often based on approximate historical conventions rather than clean physical definitions.
Cooking measurements: fixed ratios within the US system
1 US cup = 16 tablespoons = 48 teaspoons. Converting 2.5 cups: 2.5 × 16 = 40 tablespoons, or 2.5 × 48 = 120 teaspoons. These ratios are exact and fixed within the US customary measurement system, making cup-to-tablespoon-to-teaspoon conversions simple multiplication, unlike metric-to-imperial conversions elsewhere on this site.
Clothing sizes: an approximate offset, not a precise formula
US women's clothing sizes convert to EU sizes using roughly US Size + 32. A US size 8 converts to approximately EU size 40. This is a rough industry approximation, not a physical law — actual sizing varies significantly by brand, and a "US 8" from one brand may not match a "US 8" from another, making any size conversion inherently approximate even before crossing between countries' sizing systems.
Shoe sizes: different offsets for EU and UK
US men's shoe sizes convert to EU sizing using roughly US Size + 33, and to UK sizing using roughly US Size − 0.5. A US men's size 10 converts to approximately EU size 43 and UK size 9.5. Unlike clothing, shoe sizing has slightly more standardization globally, though "roughly" still applies — actual foot measurement (in millimeters) remains the most reliable cross-brand comparison.
Why these conversions are all approximations, unlike physical unit conversions
Meters-to-feet or Celsius-to-Fahrenheit describe fixed physical relationships that never change. Clothing and shoe size conversions instead describe historically evolved industry conventions that differ by brand, country, and even by specific garment or shoe style — which is exactly why serious cross-border shoppers are advised to check a specific brand's own size chart rather than relying on a generic conversion alone.
Common mistakes to avoid
- Treating clothing or shoe size conversions as exact, when they're industry rules of thumb that vary meaningfully by brand
- Confusing US cups (used in this conversion) with metric cups (250mL, used in Australia and some other countries), which are different sizes
- Assuming a single universal shoe size conversion applies to both men's and women's sizing — these commonly use different offset conventions entirely
Convert your own values with the cooking measurement converter, clothing size converter, and shoe size converter.