This page is a comparison, not a recommendation — the right method depends on health history, side effect tolerance, whether STI protection matters for a given relationship, and plans around future pregnancy, all of which is a conversation for a doctor, not an article. What this page can do is lay out the actual landscape so that conversation starts from an informed place.
Typical use vs. perfect use
Every effectiveness figure below has two numbers. Perfect use is the failure rate under ideal, error-free conditions in clinical studies. Typical use reflects real-world use, including missed doses, inconsistent application, and ordinary human error. The gap between the two numbers tells you something important: it's largest for methods that depend on remembering or applying something correctly every single time, and smallest for methods that don't depend on user action at all once they're in place.
The comparison
| Method | Typical-use failure rate | Perfect-use failure rate | STI protection |
|---|---|---|---|
| No method | ~85% | ~85% | None |
| Withdrawal | ~20% | ~4% | None |
| Fertility awareness methods | ~2-23% (varies by method) | ~0.4-5% | None |
| External condom | ~13% | ~2% | Significant reduction, not elimination |
| Internal condom | ~21% | ~5% | Significant reduction, not elimination |
| Combined pill / patch / ring | ~7% | <1% | None |
| Birth control shot (Depo) | ~4% | <1% | None |
| Implant | <1% | <1% | None |
| Hormonal IUD | <1% | <1% | None |
| Copper IUD | <1% | <1% | None |
| Vasectomy | ~0.15% | ~0.1% | None |
| Tubal ligation | ~0.5% | ~0.5% | None |
These figures are the commonly cited public-health reference numbers used across major health organizations' contraceptive-effectiveness tables (based on the widely published Trussell contraceptive failure rate data). They're population-level statistics, not a prediction for any individual — actual results depend heavily on correct, consistent use for the methods where that matters.
Go deeper on a specific method
- External and internal condoms — correct use, common mistakes, what actually causes breakage.
- The pill, patch, and ring — how combined hormonal methods work and differ from each other.
- The implant and the birth control shot — progestin-only long-acting options.
- IUDs — hormonal vs. copper, and what insertion actually involves.
- Fertility awareness methods and withdrawal — what they actually require to work well.
- Vasectomy and tubal ligation — permanent options, and what "permanent" actually means in practice.
- Emergency contraception — timing windows and how the options differ.
Common questions worth their own answer
- Can you get pregnant from pre-cum?
- Can you get pregnant on your period?
- What to do if a condom breaks, or after unprotected sex
- Does birth control affect libido?
Frequently asked questions
What's the difference between "typical use" and "perfect use"?
Perfect use is the failure rate under ideal, consistent, error-free conditions in clinical studies. Typical use reflects how a method performs in real life, including missed doses, inconsistent use, and human error. The gap between the two is largest for methods that depend on remembering or applying something correctly every time, and smallest for methods that don't depend on user action at all.
Which method is "the most effective"?
The methods with the lowest typical-use failure rates are the ones that don't rely on remembering to do anything: IUDs, the implant, and permanent methods like vasectomy and tubal ligation. That's a structural feature of the method, not a judgment about anyone's ability to use other methods correctly.
Can two methods be combined?
Yes, and it's common — for example, a hormonal method for pregnancy prevention alongside condoms for STI protection, since most hormonal and long-acting methods don't protect against STIs at all. A doctor can help figure out a combination that fits.
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