The annual figures you actually need
If you want the number that matters for a year of relying on condoms, the honest answer is that condoms are assessed two ways: typical use and perfect use (Wikipedia). The typical-use figure is the one that reflects real life. The occasional slip, the rushed moment, the condom that goes on late or comes off early. The perfect-use figure is what happens when a condom is used correctly every single time. The gap between those two numbers is not a product defect; it is the space where consistency and correct technique live.
That distinction is the whole point of this page. Condoms help prevent pregnancy and reduce the risk of sexually transmitted infections (STIs) (NHS), and they do it by stopping sperm from getting into the vagina so sperm cannot meet an egg (Planned Parenthood). The method works; the annual figure depends on how reliably you use it. When you see a single “condom effectiveness” number quoted without saying which measure it is, treat it as incomplete until you know whether it is typical or perfect use.
What moves the number: consistency and correct use
The two behaviours that close the gap are consistency and correct use. Consistency means a condom every time, from start to finish — you put a condom on the penis before vaginal, anal or oral sex (NHS). Correct use means the condom is on properly, stays on, and is handled so it does not tear or slip. Those are the levers you control, and they are the reason the typical-use figure sits where it does rather than at the perfect-use figure.
This is also why condoms are described as single use (Brook). A condom is not a reusable barrier; each act needs a fresh one. If you find yourself stretching a condom across multiple acts, or starting without one and putting it on partway, you have moved yourself from the perfect-use column toward the typical-use column. The material matters too: external condoms are typically made from latex and, less commonly, from polyurethane, polyisoprene, or lamb intestine (Wikipedia), and people with a latex allergy should use condoms made from a material other than latex, such as polyurethane (Wikipedia). Choosing the right material is part of correct use, not a separate topic.
Where failures actually come from
Most condom failures are user failures, not product failures. That is the practical reading of the typical-versus-perfect gap: the product performs at the perfect-use level when it is used correctly, and the typical-use figure reflects what happens when it is not. The failure timing that matters is the moment of use. The condom that is put on late, the one that is not pinched at the tip, the one that is used past its single-use life. Those are the points where the annual number is made or lost.
There is a second failure mode worth naming: not using one at all. Condoms provide great protection from both pregnancy and STDs (Planned Parenthood), and that protection only exists when the condom is actually there. If you are relying on condoms as your method, the consistency behaviour is not optional — it is the method. The perfect-use figure is not a promise that a condom used once will hold for a year. It is what the annual number looks like when every act is covered.
The backup option: combining methods
If you want to move your personal annual risk below the condom-alone typical-use figure, the backup option is to combine condoms with another method. Condoms are one method among several, and the reason to pair them is that the two failure modes are different: a condom can fail at the moment of use, while a hormonal or long-acting method does not depend on that moment. Combining them means a single slip does not leave you uncovered.
The table below lays out the combination logic so you can see which pairing fits your situation. It is a decision framework, not a product recommendation — the right pairing depends on what you can use consistently and what your body tolerates.
| Combination | What the condom contributes | What the partner method contributes | Best fit for |
|---|---|---|---|
| Condom + hormonal method (pill, patch, ring) | STI risk reduction and pregnancy protection at the moment of use | Continuous pregnancy protection that does not depend on the act | People who want STI protection and a method that is not act-dependent |
| Condom + long-acting reversible method (implant, IUD) | STI risk reduction and pregnancy protection at the moment of use | Pregnancy protection that does not require daily or per-act action | People who want the lowest-effort pregnancy protection plus STI coverage |
| Condom alone, used consistently and correctly | Pregnancy protection and STI risk reduction | Nothing additional | People who will use a condom every time and want STI protection |
After a failure: what to do next
If a condom breaks, slips, or is not used, the next step is emergency contraception, and the timing matters. Emergency contraception is time-sensitive, so the practical rule is to act the same day rather than waiting to see whether a pregnancy results. The condom failure itself does not tell you whether pregnancy will follow. It only tells you that the protection you intended was not there for that act.
After a failure, also consider STI testing. Some STIs have no symptoms or may only cause mild symptoms, so people can have an infection but not know it (CDC). Testing is how you find out rather than guess. The term STI is used more often now, including by CDC, because it describes the infection rather than the disease it may cause (CDC).
The stop boundary
This page gives you the annual figures and the two behaviours that close the gap: consistency and correct use. It does not give you a personal risk percentage, because that depends on your own use pattern and health history. If you need a number tailored to you, that is a conversation with a clinician or a sexual health service, not a general reference page.