Bra Size Underbust & Cup Measurement Calculator
Calculate accurate US/UK bra band size and cup letter from snug underbust and standing bust measurements.
- 100% free
- Private in browser
- No signup
- No watermarks
Rate this tool
Be the first to rate — helps others and improves this page.
About Bra Size Underbust & Cup Measurement Calculator
Calculate accurate US/UK bra band size and cup letter from snug underbust and standing bust measurements. Enter Snug Underbust Measurement and Standing Fullest Bust Measurement and the tool works out Recommended Band Size and Cup Difference straight away. Everything runs in your browser, so your data never leaves your device.
How to use Bra Size Underbust & Cup Measurement Calculator
- Enter Snug Underbust Measurement and Standing Fullest Bust Measurement.
- Change any value to see the result update instantly.
- Read Recommended Band Size and Cup Difference in the results panel — copy or download what you need.
Key features
- Shows Recommended Band Size (Even Number)
- Shows Cup Difference (1=A, 2=B, 3=C, 4=D, 5=DD)
- 2 adjustable inputs, results update as you type
- No signup, no limits
- Runs entirely in your browser — nothing is uploaded
Frequently asked questions
- Is this calculation free and private?
- Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.
- What does the Bra Size Underbust & Cup Measurement Calculator give me?
- It works out Recommended Band Size and Cup Difference, updating live as you change the inputs.
- What do I need to enter?
- Just Snug Underbust Measurement and Standing Fullest Bust Measurement. Every field has a sensible default you can start from.
- Is my data uploaded anywhere?
- No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
- Does it work on a phone?
- Yes. The layout adapts to small screens and needs no app or signup.
Related In-Depth Guides
Learn practical workflows, real-world examples, and expert tips in our comprehensive guides:
Home Remodeling Material Takeoff Guide: Tile Grout, Drywall Mud & Kitchen Cabinet Runs
Professional contractor takeoff formulas for interior renovations. Accurately estimate tile grout bags, drywall joint compound for Level 4 finishes, and modular kitchen cabinet spacing.
How to Size a Home Emergency Generator: Running vs Surge Watts & Propane Runtime
Complete electrical guide to calculating running watts, motor startup surge wattage, transfer switches, and fuel consumption for winter storms and outages.
Patio Paver & Retaining Wall Installation Guide: Base Gravel, Sand & Block Calculations
Avoid settling, cracking, and water pooling. Step-by-step math for paver patterns, 4-6 inch aggregate base, 1-inch bedding sand, and drainage gravel.