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Emergency Contraception Effectiveness Calculator

See how effective emergency contraception is based on time since unprotected sex. The sooner you take it, the better it works.

When did unprotected sex occur?
Choose how you want to enter the timing
12hours
Just now1 day2 days3 days4 days5 days
Postinor
Levonorgestrel 1.5mg • ₱559
95% effective
  • ✓ Effective up to 72 hours (3 days)
  • ✓ Most affordable option
  • ✓ Single 1.5mg dose
MifestadRecommended
Ulipristal Acetate 30mg • ₱959
98% effective
  • ✓ Effective up to 120 hours (5 days)
  • ✓ Higher efficacy throughout window
  • ✓ Best for later timing or higher BMI
Our Recommendation

Both options are highly effective at this timing. Mifestad offers slightly higher efficacy (98% vs 95%).

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Effectiveness Timeline
How effectiveness changes over time for each option
PostinorUp to 72h
95%
95%
85%
58%
MifestadUp to 120h
98%
97%
95%
85%
0h24h48h72h96h120h
Your current timing: 12h
Frequently Asked Questions

How effective is emergency contraception after 24 hours?

Levonorgestrel (Postinor) is about 85% effective at 24-48 hours. Ulipristal acetate (Mifestad) maintains 97% effectiveness at this timing.

Can I take emergency contraception after 72 hours?

Ulipristal acetate (Mifestad) is effective up to 120 hours (5 days) after unprotected sex, maintaining about 85% effectiveness even at 72-120 hours.

Which emergency contraception should I choose?

If within 24 hours, both options are highly effective. After 24 hours, ulipristal acetate (Mifestad) is recommended due to higher effectiveness. After 72 hours, only Mifestad remains effective.

Medical Disclaimer: This calculator provides general information only. Effectiveness varies by individual factors. Consult a healthcare provider for personalized advice.

Data sourced from WHO and FDA guidelines on emergency contraception.