Bikini Size Calculator: Top & Bottom Size (XS–XXL)

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📏 How to measure bust, waist and hipsTap to see the illustrated guide

Illustration: how to measure bust, waist and hips — Wear light clothing and stand with feet together, arms relaxed. Bust: round the fullest part of the bust, tape level all the way round.

Wear light clothing and stand with feet together, arms relaxed.
Bust: round the fullest part of the bust, tape level all the way round.
Waist: round the narrowest part of the waist, usually just above the belly button.
Hips: round the widest part of the hips and bottom, feet together.

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Fill in the details and click Calculate to see your results.

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📘 About the Bikini Size Calculator

This bikini size calculator estimates bikini top and bottom sizing from bust, waist and hip measurements.

You can enter measurements in meters, centimeters, inches or feet.

The calculator keeps the top and bottom calculations separate because a person can require different sizes for the upper and lower body.

The reference size model is based on published womens swimwear measurement ranges. Bikini sizing is not a universal international standard and can vary between brands and individual products.

✏️ Worked examples

Bust 90, waist 74, hips 98 cm

You enter
Measurement Unit	Centimeters (cm)
Bust Measurement	90
Waist Measurement	74
Hip Measurement	98

You get
Bikini top size	S
Bikini bottom size	S
One size for both (if buying a set)	S
UK dress-size equivalent	Top 8 · Bottom 8
US size equivalent	Top 4–6 · Bottom 4–6
Your measurements	Bust 90 cm · Waist 74 cm · Hips 98 cm

Top S, bottom S.

Bust 36, waist 29, hips 39 inches

You enter
Measurement Unit	Inches (in)
Bust Measurement	36
Waist Measurement	29
Hip Measurement	39

You get
Bikini top size	S
Bikini bottom size	S
One size for both (if buying a set)	S
UK dress-size equivalent	Top 8 · Bottom 8
US size equivalent	Top 4–6 · Bottom 4–6
Your measurements	Bust 91.4 cm · Waist 73.7 cm · Hips 99.1 cm

Top S, bottom S.

🧭 How to use this calculator

What you enter

Measurement UnitChoose the unit you will use for all body measurements.
Bust MeasurementRound the fullest part of the bust, tape level.
Waist MeasurementRound the narrowest part of the waist.
Hip MeasurementRound the widest part of hips and bottom, feet together.

What you get

Bust (cm)
Waist (cm)
Hips (cm)
Bikini Top Size Code - 1=XXXS, 2=XXS, 3=XS, 4=S, 5=M, 6=L, 7=XL, 8=XXL
Bikini Bottom Size Code - 1=XXXS, 2=XXS, 3=XS, 4=S, 5=M, 6=L, 7=XL, 8=XXL
Overall Bikini Size Code - 1=XXXS, 2=XXS, 3=XS, 4=S, 5=M, 6=L, 7=XL, 8=XXL

💡 How the bikini size is calculated

Your selected measurement unit is converted to centimeters.
The bust measurement determines the estimated bikini top size.
The waist and hip measurements are separately evaluated for the bikini bottom.
The larger requirement from waist and hips is used for the bottom size.
The overall bikini size uses the larger requirement between the top and bottom.

💡 How to measure your bust

Measure around the fullest part of your bust.
Keep the measuring tape level around your body.
Keep the tape comfortably snug without compressing breast tissue.
Stand naturally while measuring.

💡 How to measure your waist

Measure around your natural waist.
Keep the tape comfortably snug.
Do not hold your stomach in while measuring.
Keep the tape level around your body.

💡 How to measure your hips

Measure around the fullest part of your hips and seat.
Stand naturally with your feet together.
Keep the tape level around the body.
Do not pull the tape excessively tight.

💡 Bikini size mapping

Size code 1 = XXXS.
Size code 2 = XXS.
Size code 3 = XS.
Size code 4 = S.
Size code 5 = M.
Size code 6 = L.
Size code 7 = XL.
Size code 8 = XXL.

💡 Why separate top and bottom sizes matter

Bikini tops are primarily fitted using bust measurements.
Bikini bottoms are primarily fitted using waist and hip measurements.
Body proportions can mean that the best top and bottom sizes are different.
For a bikini set with separate sizing, use the individual top and bottom results rather than forcing one size.

💡 Important sizing limitation

There is no single universal bikini sizing standard.
Different brands can use different measurement ranges.
Fabric stretch can change how a bikini fits.
High waist, low waist, cheeky, full coverage and other cuts can fit differently.
Always compare your measurements with the exact product size chart before purchasing.

❓ Frequently asked questions

Can I enter bikini measurements in meters?

Yes. Select meters and enter the bust, waist and hip measurements in meters.

Can I enter bikini measurements in centimeters?

Yes. Centimeters are supported and are commonly used in swimwear size charts.

Can I enter bikini measurements in inches?

Yes. Select inches and enter all three measurements in inches.

Can I enter bikini measurements in feet?

Yes. Select feet and enter all three measurements in feet.

Why are bikini top and bottom sizes calculated separately?

Bust, waist and hip proportions vary between people, so the correct top and bottom sizes can be different.

Is bikini sizing universal?

No. Bikini sizing varies between brands, countries, styles and product lines. The calculator provides a reference estimate rather than a universal size.

What should I do if my top and bottom sizes are different?

If the bikini is sold as separates, use the calculated top and bottom sizes independently. If the product only comes as one fixed-size set, compare the measurements with the manufacturers chart and consider the fit priority for the particular style.

What size bikini should I get?

Choose the top by your bust and the bottom by your hips and waist. If they differ, buy separates rather than a set.

👙 Bikini Size Calculator