Dildo Sizing Guide – Choosing the Right Length and Width

Finding the perfect dildo involves careful consideration of the features and, of course, finding the correct dildo size. We have prepared a complete guide to dildo sizing to help you learn how to measure your vagina to find the size you can safely and comfortably manage. Before we go into more detail, we need to clear something up – the size of an average erect penis is about 5.5 inches in length and about 4.5 to 5 inches in circumference, or about 1.5 inches in diameter. That should make things more clear, as this is the average size most vaginas can take comfortably. But because not all vaginas are alike, we’ll explain how to measure your vagina to find the perfect dildo size.

How to Measure Yourself for a Dildo?

To measure, you will need a vibrator, dildo, or another phallic item that is long and smooth so you can use it as an insertable toy. Always clean the toy you’ll use, and also get a soft tape measure and follow these steps to measure your vagina:

When you are aroused, the vagina elongates and can accommodate a longer size toy/penis, so make sure you are sufficiently aroused when measuring. Lie back and do the things that stimulate you, or even get your partner to help you with arousal. When you are adequately aroused, you can slide the phallic object into your vagina. When it reaches the furthest point, mark the point, remove the object, and measure from the tip to the length you’ve inserted – now you have the maximum dildo length you can manage.

We recommend you use your (or your partner’s) fingers to measure the girth the vagina can safeely manage. Simply slide fingers into the vagina, one finger at a time, until you reach the limit you can comfortably enjoy. Remove the fingers and wrap the tape measure around the fingers to get the circumference you can safely manage. To get the diameter, you can simply divide the circumference by 3.14 (Pi), and you’ll get the dildo diameter.

Main Dildo Measurement and Sizes

You need to know the four main measurements of dildos when you shop for the perfect dildo toy:

• Total length – The complete length of the dildo from end to end; this measurement includes a suction cup base or a handle.
• Insertable length – the length of the toy that you can insert.
• Width/diameter – the distance between the opposite sides of the toy.
• Girth/circumference – the circumference of the dildo at its widest point.

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 dildo product line and an average soda can. The following images will help you visually compare different dildo sizes:

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 width is pretty straightforward. The width is the length across the broadest part of the dildo. The chart below shows you a comparison between the width and girth of an average male penis and different dildo sizes:

Sizing for Realistic Dildos

A realistic skin dildo is soft to deliver that required realistic feel. These can be purchased 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. The realistic dildos range from small circumferences of between 2 and 3 inches all the way to a more extensive range of 8 inches and above.

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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.

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Sizing for Double Ended Dildos

Double dildos come in two types, double ended and dildos for double penetration. DP (deep penetration) double dildos range in sizes of around 6 inches in length the vagina, and the anus section comes in at around 5 inches.

The circumference of the vaginal shaft ranges from 4 inches to approximately 6 inches, while the anus side is usually from 3 inches to around 4 inches. Double ended dildos range in circumference from approximately 4 inches to around 6 inches. We suggest only experienced users try double-ended dildos as the experience can be overwhelming.

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Sizing for Glass Dildos

Glass dildos are a solid and unyielding, 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. The models vary from a little under 5 inches upward to between 9 to 12 inches. We must note that glass is a great option for temperature play, but because of the nature of the material, even using a smaller dildo may feel like you are using a big one.

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Sizing for Large Dildos

Big and large dildos are made to stretch, so taking a width measurement of your vagina is a starting point. To measure yourself, follow the instructions for measuring for a dildo above to find out the size you can comfortably accommodate. Measuring the vagina will give you a measurement that is the smallest you can choose. We suggest you get a thinner dildo initially, and after you get good experience, you can consider using a larger dildo.

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 the range of over 12 inches or more.

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Sizing for Squirting Dildos

Ejaculating dildos often come with testicles or another squirting mechanism, so the overall length is larger than the shaft that can be inserted. You can measure for a squirting dildo like you would for a realisitc dildo, as there is not much difference in size, except for the squirting feature.

The length of squirting dildos 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.

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Sizing for Small Dildos

Not everyone can take larger sized dildos, and some people enjoy the stimulation from smaller sized dildos. 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 with small dildos.

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.

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Sizing for Strapless Strap-ons

Sizing for strapless dildos is different from other dildo types. Because of their design, lengths are limited to around 7 inches, any more than this, it would 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, so measure it with the measuring tape around the widest part to give you the circumference. The circumference of strapless dildos ranges from just under 4 inches to around 5.5 inches.

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Sizing for Suction Cup Dildos

Suction cup dildos 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. Measue the length you can comfortably take in your vagina, and don't be zealous as you may harm yourself when sinking down on a suction cup dildo.

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 length.

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Sizing for Vibrating Dildos

Vibrating dildos are fun and exciting, as on top of having a realisitc shape, these have built-in vibrations that you can usually control via buttons, or wired or wireless remote controllers. These come in very similar sizes to regular dildos, and often have realistic shape, so you can use the same measurements as you would any realistic dildo.

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 lengths are around 5 inches.

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Sizing for Male 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, the anal dildos do come with girth. Anal dildos come in widths (diameter) a little under 1 inch and go up to a range of almost 2 inches in width. The length range from around 5 inches up to 12 inches (or above).

The way to measure your anus elasticity is to get on all fours, spread your legs and relax. Your partner 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 the male dildo you should start with.

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Learn More With Our Other Sex Toy Guides:

How to Choose Kegel Balls?
How to Choose a Vibrator?
How to Choose a G-Spot Vibrator?
How to Choose a Clitoral Vibrator?
How to Choose a Finger Vibrator?
How to Choose a Wand Vibrator?
How to Choose a Tongue Vibrator?
How to Choose a Dildo?
How to Use a Dildo
How to Choose a G-Spot Dildo?
How to Use a Thick Dildo
How to Use a Thrusting Dildo
How to Use a Glass Dildo
How to Use a Suction Cup Dildo
How to Use a Vibrating Dildo
How To Choose a Small Dildo
How to Clean Sex Toys?
How to Hide Sex Toys?
How to Travel with Sex Toys?
How to Dispose of Sex Toys?