This calculator is based on the popular “Sizing 101” method advocated by the r/ABraThatFits community, using multiple bust measurements for increased accuracy.
The **bra fit calculator reddit** method is renowned for providing a more accurate, measurement-based starting bra size, moving beyond traditional fitting methods. Input your six core body measurements below (in inches) to find your suggested UK bra size.
UK Bra Size Calculator
bra fit calculator reddit Formula
Band Size (in): Nearest even number to Snug Underbust.
Bust Size (in): Average of Standing, Leaning, and Lying Bust measurements.
Cup Difference (in): Bust Size – Band Size.
Cup Letter: Corresponds to Cup Difference (1 in = A, 2 in = B, 5 in = DD, etc.)
Formula Source: ABraThatFits Calculator Documentation, Bratabase Measuring Instructions.
Variables Explained
- Snug Underbust: Used to determine the band size. This measurement should be comfortable but level.
- Tight Underbust: Provides a reference for how tight the band can possibly be stretched.
- Standing Bust: A basic bust measurement taken while standing naturally.
- Leaning Bust: Often the largest and most accurate measurement for projected tissue. Used heavily in the calculation.
- Lying Bust: Measured on your back to gauge upper breast volume, useful for shape assessment.
What is bra fit calculator reddit?
The “bra fit calculator reddit” method refers to the fitting guide established by the highly active r/ABraThatFits community. Unlike the “add four inches” method common in retail, this approach strictly uses the **Snug Underbust** measurement for the band and the difference between **Bust and Band** for the cup.
This multi-measurement approach (Snug, Tight, Standing, Leaning, Lying) aims to capture the full volume of breast tissue, leading to a much more accurate initial size recommendation, particularly for those with larger cup sizes or unique breast shapes.
How to Calculate Your UK Size (Example)
- Determine Band Size: Start with the Snug Underbust measurement (e.g., 34.5 inches). Round this to the nearest even number (34 inches). This is the suggested band size.
- Determine Cup Size Basis: Take the largest bust measurement (usually Leaning Bust, e.g., 41 inches).
- Calculate Cup Difference: Subtract the Band Size from the Leaning Bust (41 in – 34 in = 7 inches).
- Find Cup Letter: 7 inches of difference corresponds to a UK ‘F’ cup.
- Final Suggested Size: Combine the Band and Cup: **34F**.
Related Calculators
Explore other specialized sizing tools:
- Sister Size Conversion Tool
- UK to US Bra Size Converter
- Maternity Bra Size Predictor
- Racerback Converter Sizing
Frequently Asked Questions (FAQ)
What if my tight underbust is much smaller than my snug underbust?
A large difference suggests you need a very firm band. The calculator uses the snug measurement, but you might prefer sizing down the band for a tighter fit.
Why are there three different bust measurements?
The three measurements (Standing, Leaning, Lying) help account for breast density and projection. The calculator often uses the largest one (Leaning) to ensure enough cup volume is accounted for.
What is ‘Sister Sizing’?
Sister sizing means moving one band size up or down while simultaneously moving one cup size down or up to maintain the same cup volume. For example, 34C is the sister size of 32D and 36B.
Is this UK or US sizing?
The r/ABraThatFits method primarily outputs in UK sizing (A, B, C, D, DD, E, F, FF, G, etc.) because it is more consistent across larger cup sizes than US sizing.