Plus Petite Size Calculator

If you’re short and curvy, you’ve probably been told to “just size up.” That’s not advice. That’s a shrug. Sizing up gives you more width, but it also gives you longer sleeves, a lower waist and a longer rise, and none of that was the problem.

This calculator does the fitting room math for you. Enter your height and three measurements, and it tells you whether you’re plus petite. It also gives you your size for tops, bottoms and dresses, and explains why those can be different.

What “plus petite” actually means

Plus petite isn’t one measurement. It’s two separate things that happen to show up on the same body.

• Petite is about length. Most brands design petite for women 5’4″ and under. It changes where things sit on your body, not how wide they are.
• Plus is about width. Women’s plus sizes usually start at 14W or 16W and are cut with more room through the bust, waist and hips.
• Plus petite is both. You’ll see it written as 18WP, 18W Petite or 1XP, depending on the brand.

How to measure yourself

Use a soft tape measure, wear your usual bra, and stand relaxed in front of a mirror so you can check the tape stays level.

1. Height. Stand barefoot against a wall, rest a book flat on your head, mark the wall and measure from the floor.
2. Bust. Measure around the fullest part of your chest, keeping the tape straight across your back.
3. Waist. Bend to one side. The crease that forms is your natural waist. Measure there, without pulling in your stomach.
4. Hips. Stand with your feet together and measure around the fullest part of your seat.

Keep the tape snug but not tight. If you can’t slide a finger under it, it’s too tight.

How the calculator works

First, your height sets your length category: petite at 5’4″ and under, regular from 5’5″ to 5’7″, and tall from 5’8″. If you’re right on the line at 5’4½”, you’ll be told to try both.

Next, your measurements are matched to a standard women’s size chart:

• Tops are sized by your bust, because that’s the measurement a top can’t cheat on.
• Bottoms are sized by whichever is larger, your waist or your hips.
• Dresses use the largest of all three, since a dress has to fit everywhere at once.

Here’s the chart the calculator uses. Your favorite brands will be close to it, but never identical.

What a petite cut changes (and why hemming isn’t enough)

When a brand makes a true petite version, it doesn’t just chop off the bottom. It usually changes all of these:

• Sleeve length, so cuffs land at your wrist instead of your knuckles.
• Shoulders and bust shaping, so darts and seams sit on your bust instead of below it.
• Waist placement, so the waist of a dress or jacket meets your actual waist.
• The rise on pants, so the fabric doesn’t bunch below the zip.
• The inseam and hem, the only part a regular-length garment lets you fix easily.

That’s why a regular dress, hemmed perfectly, can still look wrong on you. The waist is in the wrong place, and no tailor can move it for $20.

When your top and bottom sizes don’t match

It’s very common for plus petite women over 50 to be two or more sizes apart on top and bottom. That’s not a problem with your body. It just changes how you shop:

• Buy separates whenever you can, so each half fits.
• For dresses, fit the larger half and have the smaller half taken in. Loose can be fixed. Tight can’t.
• Wrap styles and stretch fabrics adjust themselves to different top and bottom sizes.
• Matching sets sold as separates are ideal. See my matching set outfits for plus size petite women over 50.

Shopping tips for plus petite women over 50

• Check whether “petite” means petite plus. Some brands only offer petite up to size 16. Look for “WP” or “Petite Plus” in the filters.
• Measure yourself every season or two. Our bodies change after 50, and yesterday’s size isn’t a promise.
• Always check the brand’s own chart. Use the Size Chart Decoder to compare your numbers with theirs before you order.
• Buy for your shoulders on jackets. Everything else can be tailored. Shoulders can’t.

For outfit ideas once you know your size, browse my professional outfits for plus size petite women over 50 and wide leg pants outfits that don’t drown you.

Frequently asked questions

Am I petite if I’m 5’4″?

Yes. Most brands design petite for women 5’4″ and under. At 5’4½” or 5’5″ you’re on the line, so it’s worth trying petite for tops and dresses. Your torso length matters as much as your height.

What does WP mean on a label?

WP stands for “women’s petite,” the label many brands use for plus petite. An 18WP has the width of an 18W with petite lengths. Some brands write it as 18W Petite or 1XP instead.

Is plus petite the same as a smaller plus size?

No. A smaller plus size is narrower everywhere. Plus petite keeps the plus width but is shorter in the sleeves, torso, rise and length. If you size down to get a shorter fit, it’ll be too tight.

Why is my top size different from my bottom size?

Most women carry weight differently above and below the waist. The calculator sizes tops by your bust and bottoms by your waist and hips, because that’s how garments actually fit.

How accurate is this calculator?

It uses a standard size chart, so it’s a reliable starting point. Every brand’s chart is slightly different, which is why the result links you to the Size Chart Decoder for brand-by-brand checks.

More Plum & Poise fit tools

• Size Chart Decoder: see which size to order from any brand’s chart.
• Tailor or Return? Fit Checker: find out what’s worth fixing.
• Short-Waisted or Long-Waisted Test: learn where your waist really sits.
• Pants Rise & Inseam Finder: the two numbers that make pants fit.