Dildo Sizing Guide – Choosing the Right Length and Width

If you want to know what size dildo your vagina can accommodate, it’s interesting to know that the average erect penis is around 5.5 inches in length and approximately 4.5 to 5 inches in girth. 

How to Compare Different Dildos in Length?

The good folks at Pipedream created this visual showing the difference between some of their most popular dildos – the King Cock product line and an average soda can. This will help you visually compare different dildo sizes.

 

dildo-size-comparison-6-to-9-inch

dildo-size-comparison-10-to-12-inch

How to Compare Different Dildos in Width?

In general, the longer the dildo the thicker it's going to be. This is because most realistic dildos use proportionate dimensions. Measuring with is pretty straight forward. It is the width is across the widest part of the dildo. The chart below shows you circumference or girth comparison.

Dildo Width Comparison

WIDTH                    APPROXIMATE GIRTH

1 Inch                       3 to 3.5 Inches

1.25 Inches              3.75 to 4 Inches

1.5 Inches                4.5 to 4.75 Inches (Average erect penis size)

1.75 Inches              5 to 5.5 Inches

2 Inches                   5.5 to 6.75 Inches

2.5 Inches                7 to 7.75 Inches

3 Inches                   8 to 8.5 Inches

How to Measure Yourself for Dildos?

To measure you will need a vibrator or dildo, or an alternative item that is long and has a smooth surface; it should also be rounded on the end. If using these, clean them before use. You also need a soft tape measure.

Being aroused can enable the vagina to accommodate more, so lie on your back on the bed and stimulate yourself, or allow your partner to excite you. Once aroused, start sliding the alternative object into your vagina.

Once at the furthest point, mark where you are on the alternative object. Remove the object and measure how far from the tip to the fingers. This is the length you can cope with.

To measure girth, ask your partner to slide fingers into the vagina until you reach the limit you can enjoy comfortably. When you feel you have reached this point, wrap the tape measure around their finger/s to find the circumference/girth your vagina can accommodate.

How Do You Measure Sex Toys?

Generally speaking, there are four measurements you should be familiar with.

Length: The vertical length of the toy from the two farthest points. We sometimes refer to this as total length as well.

Insertable Length: The length of the toy designed to be safely inserted.

Width (or diameter): The distance between the two sides of the toy.

Girth (or circumference): The circumference of the toy which is relevant to insertable toys.

 sex toy sizing 

Dildo Types

  • Anal Dildos
  • Black Dildos
  • Double Dildos
  • Ejaculating Dildos
  • Glass Dildos
  • Huge Dildos
  • Realistic Dildos
  • Silicone Dildos
  • Strapless Dildos
  • Suction Cup Dildos
  • Vibrating Dildos

Sizing for Anal Dildos

It’s very different measuring for an anal dildo than a regular one. To get this right, it’s best to ask a partner to help so you can relax. The whole point of anal is to feel the stretching more than length. However, length does come with girth.
 
The way to measure your anus elasticity is to get on all fours, spread your legs and relax. Your assistant should lube your anus well, and also their fingers. Until you are fully relaxed, they should begin with one finger, and after a while, slide in a second. This can be repeated until you are at your most relaxed and have found your limit. At this point, they can withdraw their fingers so you can measure around them with the soft tape measure. This is the circumference or the girth.
 
Anal dildos come in widths (diameter) a little under 1 inch and go up to a range of almost 2 inches in width. Insertable lengths can range from around 5 inches up to 12 inches (or above).
 

anal dildos

Sizing for Black Dildos

Black dildos are usually larger than regular dildos to give the feel of well-hung males.
 
Black dildos vary in sizes and can start at around 5 inches in length and range up to roughly 8 inches or above. The circumference will range between 4 to 5 inches.
 black dildos

Sizing for Double Dildos

Double dildos come in two types, double ended and double dildos for double penetration.
 
DP (deep penetration) double dildos range in sizes of around 6 inches in length for the vagina, and the anus section comes in at around 5 inches. Circumference for the vaginal shaft ranges from 4 inches to approximately 6 inches, while the anus portion will be from 3 inches to around 4 inches, approximately.
 
Double ended dildos range in circumference from approximately 4 inches to around 6 inches. Insertable length is variable because they are so long. This may vary from manufacturer to manufacturer.
 double dildos

Sizing for Ejaculating Dildos

Yes, ejaculating dildos often come with testicles, so the overall length is larger than the shaft that can be inserted.
 
The length that can be inserted ranges from around 5 inches up to roughly 8 inches, and the circumference can range from 4 to 5 inches up to approximately 7 inches.
ejacualting dildos
 

Sizing for Glass Dildos

Glass dildos are a solid material, so making sure that you size yourself correctly can make all the difference.
 
These come in a range of circumference sizes that begin around 2 to 3 inches and go up to between 6 and 7 inches. Insertable lengths range from shorter models at a little under 5 inches upward to ranges between 9 to 12 inches.
 glass dildos
   

Sizing for Huge Dildos

Huge dildos are made to stretch, so taking a width measurement of your vagina will only be a starting point.
To measure yourself, follow the instructions for regular dildos to find out the size you can comfortably accommodate. Measuring the vagina will give you a measurement that is the smallest you can choose.
Large dildos have a starting circumference of between 4 and 5 inches and can go up to over a 10-inch circumference. The insertable length can begin at around 5 inches and can go in to the range of over 12 inches or more.
 large dildo

Sizing for Realistic Dildos

A realistic dildo is soft to deliver that required realistic feel. These can be ordered a little larger as they will mold to the body. To find the ideal size, you need to find the circumference that your vagina will match.
To measure yourself, follow the instructions for regular dildos to find out the size you can comfortably accommodate.
Length comes in relation to circumference, so the more significant the circumference, the longer the realistic dildo. These range from small circumferences of between 2 and 3 inches all the way to a more extensive range of 8 inches and above.
Insertable lengths will follow this from ranges under 5 inches and up to 12 inches (and above) for the fatter dildos.
 

Sizing for Silicone Dildos 

Silicone dildos come in all manner of designs, so it is good to know the extent of what size your vagina can comfortably accommodate.
Because there are lots of designs, it’s better to know the depth of the vagina as well as the width of silicone dildo it can accommodate.
You can find silicone dildos with circumferences from 2 inches and ranging up to 7 inches. For the length, they will range from under 5 inches all the way to about 8 inches.
 silicone dildo

Sizing for Small Dildos

Not everyone can take larger sized dildos, and some people like the arousal from smaller sizes. So it’s worth knowing the sizes that will feel good in the vagina.
Most small dildos only have an insertable length to around 5 or 6 inches, over this, they are not classed as small. To measure your vagina for these, it can be done your own, as length isn't an issue.
To measure yourself, follow the instructions for regular dildos to find out the size you can comfortably accommodate.
Small dildos range in circumference from about 2 to 3 inches and go up to around a maximum of 6 inches.
 
 

Sizing for Strapless Dildos

Sizing for strapless dildos is different from any other. And because of their design, insertable lengths are limited to around 7 inches, any more than this, and it can be difficult to hold them in place. 

The wearer needs to know the size of the bulb that will fit into her vagina. This is the widest part which sits on a thinner neck. The wearer needs to be sufficiently stimulated before the partner slides fingers in to the point where the vagina shows resistance. This will be the widest point the bulb stretches the vagina.

To measure this, wrap the tape around the fat part to give you the circumference. The circumference of strapless dildos ranges from just under 4 inches to around 5.5 inches.

strapless dildo

Shop Strapless Dildos

Sizing for Suction Cup Dildos

These are designed for hands-free stimulation, so you do need to know the size you can take because you won’t be feeling resistance through your fingers.
These can range from short and thin with an insertable length of 5 to 6 inches, and go all the way to over 10 inches. The circumference of these will be from 2 to 3 inches for the shorter suction cup dildos and will hit a top range of between 10 to 13 inches for the insertable length.
 suction cup dildo


Sizing for Vibrating Dildos

Vibrating dildos start with a circumference around 4 to 5 inches, and these range up to 6 to 7 inches and come with an insertable length of around 8 inches. The shorter insertable lengths are around 5 inches.