Track clothing sizes for the people you love. AI predicts how they grow — so whether it's a birthday sweater or holiday shoes, it always fits.
Buying clothes for the people you love shouldn't feel like a gamble.
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"I think she's a medium? Or maybe a large now… she grew so fast."
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"He loved it — but it didn't fit. Now I have to return it before Christmas."
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"I haven't seen her in a year. I have no idea what size to buy."
1 in 3 clothing gifts is the wrong size. SizeUp fixes that.
Three steps and you'll never guess a size again.
Add family members and friends. Include their date of birth for smarter AI predictions.
Chest, waist, and foot length is enough to generate a full size card — in US, EU, UK, and more.
Check their size card any time. Share it with family. Get reminders before birthdays.
Enter measurements once — SizeUp converts them to US, EU, UK, JP, and AU sizing automatically. No more cross-referencing charts or guessing brand conversions.
Emma's sizes — today
UStops
7/8
bottoms
7
shoes
1
Today (age 7)
UStops
7/8
bottoms
7
shoes
1
In 6 months (predicted)
UStops
10/12
bottoms
10
shoes
3
Kids grow 2–3 sizes per year. Buying for a birthday 3 months away? SizeUp predicts their size at that exact date — using CDC growth curves for children and AI for adults.
Add birthdays, holidays, and special occasions. SizeUp shows you exactly how many days you have to shop — with the right size already waiting for you.
Emma's Birthday
Coming up soon
Dad's Father's Day
Coming up soon
Mom's Birthday
Coming up soon
SizeUp
Last updated June 10, 2026
US
tops
7/8
bottoms
7
shoes
1
EU
tops
122
bottoms
122
shoes
32
UK
tops
7-8Y
bottoms
7Y
shoes
13
Only sizes are shared — no measurements or personal details
Generate a share link for anyone. They open it in a browser, see the sizes, and shop with confidence — without creating an account. Perfect for group gifts or distant family.
Whether you shop for one person or ten, SizeUp keeps you organised.
Kids grow so fast. Track sizes every few months and never buy a size too small again.
Surprise gifts are better when they fit. No more "I kept the receipt just in case."
Shopping for aging parents who live far away is much easier when their sizes are at your fingertips.
Share your own size card with your friends — so they can buy for you too.
Measurements feel personal. We designed SizeUp so you stay in control at every step.
Share links expose clothing sizes only — never the raw measurements you entered.
Delete a share link any time. The page becomes inaccessible immediately.
We don't sell, share, or use your data for advertising. Ever.
Free to use. Takes 2 minutes to set up. Your next gift will fit.
Get started freeNo credit card · No app download · Works on any device