Bra Size Calculator Troubleshooting FAQ
Run through these fixes whenever a calculator result feels off. Most issues resolve with better measurements, unit checks, or strategic sister sizing.
Fast fixes for common problems
The calculator result feels too tight. What should I check first?
Verify you measured the underbust on an exhale and entered the correct unit. If the band still feels restrictive, try the tighter-to-looser sister swap (e.g., 34D → 36C) before abandoning the fit.
My bust measurement is smaller than my band—why is the calculator rejecting it?
Bust must exceed band for cup calculations. Re-measure the fullest bust while keeping the tape level. If numbers are close, confirm you are using the same unit and standing tall, not slouching.
The calculator gives a size I have never seen in stores. What next?
Some regions label cups differently. Match the calculator output to our international chart and brand guides; the US/UK/EU label may look unfamiliar but represents the same volume.
Cups still gape after following the calculator. Is it inaccurate?
It may be a shape/style issue rather than a measurement error. Try plunge/balcony cuts, half cups, or a tighter sister band if the gore floats. Record areas of gaping to discuss with a fitter.
Straps dig in despite the calculator suggesting the correct size.
Digging straps usually mean the band is not carrying enough support. Test the tighter band sister size (down band, up cup) and ensure straps are shortened after the band adjustment.
Results vary every time I measure. How do I stabilize the numbers?
Use the same time of day, track readings over a week, and average them. Hydration, hormones, and workouts affect bust size—consistency in timing smooths out variations.
How do I handle post-surgery or medical changes?
Follow medical guidance first. Measure weekly as swelling subsides, prioritize wire-free styles, and expect frequent sister size experiments until recovery stabilizes.
Need a full workflow?
Pair this FAQ with the accuracy checklist to tighten up measurements end-to-end.
Accuracy checklist →