Will It Fit?

Check the fit, calmly.

Measure a toy, add a little about you, and watch a clear read take shape. You get honest guidance on lube, warm-up, and working your way up, built for safety and never explicit. Nothing you enter leaves your device.

Where does it go?

Guidance adapts to the anatomy you pick.

Units
Girth measured as

Measure the object

Drag the dials, scroll, or type. Girth matters more than length.

—cm
Girth (across)
the widest part
—cm
Insertable length
only what goes in

You (optional)

Everyone's built differently. These personalise your result and stay on your device.

Your size history

on this device only

Log girths that felt good. Your largest becomes the baseline the planner steps up from.

Nothing saved yet. Add girths you already know feel comfortable, and the planner will use your largest as a safe starting point.

cm
loading…
openingthe object
Awaiting measurements.
Waiting for measurements

Enter a girth to begin

Add the object's diameter or circumference above and your result will appear here, live.

Good things to know

Why does girth matter more than length?
You control how deep something goes simply by not pushing it all the way in, so length is rarely the limiting factor. Girth is different. The opening has to stretch around the whole width at once. That is why a shorter, thicker object can feel far more intense than a long, slim one.
How do I measure my own comfortable size?
The easiest reference is something you have already used comfortably. Measure its widest diameter straight across, or wrap a soft tape around it for circumference, and log that in your size history. If you are starting fresh, a single clean finger is a gentle place to begin.
What kind of lube should I use?
Water-based lube is the safe all-rounder and works with every toy material. Silicone lube lasts longer and is great for anal, but keep it away from silicone toys, since it can degrade them. Avoid oils with latex condoms. Whatever you choose, use more than you think you need, and reapply.
What's different about anal?
The anus does not self-lubricate, so lube is not optional. The sphincter is a muscle that needs time to relax, and the rectum curves, so go slow and let your body open at its own pace. Always use a toy with a flared base so it cannot slip fully inside, which is a genuine emergency-room risk otherwise.
How do I actually work my way up?
Patiently. Warm up, use lube, and stop while it still feels good rather than pushing to a limit. Staying comfortable at one size across several sessions is what lets the next size up feel easy. There is no prize for rushing, and going too fast is how tissue gets torn.
When should I stop or see a doctor?
Stop for sharp pain, and never push through it. See a healthcare provider for bleeding beyond a spot or two, pain that lingers for days, trouble controlling bladder or bowels, or anything that got stuck. These conversations are routine for clinicians.