How accurate is the bra size calculator?

Our calculator uses the modern ABTF (A Bra That Fits) method, which is more accurate than the outdated +4 inch method. For best results, take measurements twice and follow our measurement guide carefully.

What is the ABTF method?

The ABTF method uses your actual underbust measurement as the band size, rather than adding inches. This provides better support since the band is responsible for 80% of bra support.

Do you store my measurement data?

No. All calculations happen instantly in your browser. We do not store, sell, or share your body measurements. Your privacy is our priority.

Bra Size Calculator Online | Free & Accurate in CM/Inches

(cm)



28A	66 - 76	72 - 75	26.0 - 30.0	28.5 - 29.5
28B	66 - 76	75 - 77	26.0 - 30.0	29.5 - 30.5
28C	66 - 76	77 - 80	26.0 - 30.0	30.5 - 31.5
28D	66 - 76	80 - 83	26.0 - 30.0	31.5 - 32.5
28DD	66 - 76	83 - 85	26.0 - 30.0	32.5 - 33.5
28E	66 - 76	85 - 88	26.0 - 30.0	33.5 - 34.5
28F	66 - 76	88 - 90	26.0 - 30.0	34.5 - 35.5
28G	66 - 76	90 - 93	26.0 - 30.0	35.5 - 36.5
30A	71 - 81	77 - 80	28.0 - 32.0	30.5 - 31.5
30B	71 - 81	80 - 83	28.0 - 32.0	31.5 - 32.5

	UK		FR	IT	JP	AU/NZ	DE
28AA	28AA	70AA	85AA	3AA	70AA	6AA	70AA
28A	28A	70A	85A	3A	70A	6A	70A
28B	28B	70B	85B	3B	70B	6B	70B
28C	28C	70C	85C	3C	70C	6C	70C
28D	28D	70D	85D	3D	70D	6D	70D
28DD	28DD	70E	85E	3E	70E	6DD	70E
28DDD	28E	70F	85F	3F	70F	6E	70F
28G	28F	70G	85G	3G	70G	6F	70G
28H	28FF	70H	85H	3H	70H	6FF	70H
28I	28G	70I	85I	3I	70I	6G	70I

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