How do I know if a condom is the right size?

Short answer

A condom is likely the right size when it rolls down comfortably to the base, stays in place during sex, and is not painfully tight or repeatedly slipping. Brand sizing is not standardised in one universal way, so use the manufacturer’s size guidance and try a different labelled size if the fit is uncomfortable. Use a new condom every time.

Focus on fit, not a number

There is no prize for choosing a particular size. A condom that feels too tight may be uncomfortable, and one that keeps slipping may not provide reliable protection. Different materials and shapes can also feel different.

For material compatibility, this site explains why coconut oil is not compatible with latex condoms.

Use it correctly from the start

Check the expiry date and package, put it on before genital contact, and use a new condom for each act of sex. If it breaks or slips, stop and consider what to do after a condom slips without ejaculation.

Do not use two external condoms together

Two condoms can rub against each other and are more likely to break. One correctly fitted condom is the safer choice.

Sources and further reading

• NHS: Condoms (accessed August 2026)
• CDC: Condom use (reviewed January 19, 2024)