Pregnancy

Pregnancy Risk Calculator

This page helps you estimate the likelihood of getting pregnant based on several key factors. Select the appropriate options below to see your estimated chances per menstrual cycle and for a single act of intercourse. The calculations are based on scientific studies and account for factors like age, contraception use, and lifestyle.

Your Inputs

[{"age_group":"20-24","fecundity_per_cycle":"0.25","odds_ratio_vs_25_29":"1.0"},{"age_group":"25-29","fecundity_per_cycle":"0.20","odds_ratio_vs_25_29":"1.0"},{"age_group":"30-34","fecundity_per_cycle":"0.15","odds_ratio_vs_25_29":"0.85"},{"age_group":"35-39","fecundity_per_cycle":"0.10","odds_ratio_vs_25_29":"0.70"},{"age_group":"40-44","fecundity_per_cycle":"0.05","odds_ratio_vs_25_29":"0.50"}] [{"age_group":"20-29","fecundity_reduction_per_cycle":"0.00","odds_ratio_vs_25_34":"1.0"},{"age_group":"30-34","fecundity_reduction_per_cycle":"0.05","odds_ratio_vs_25_34":"0.95"},{"age_group":"35-39","fecundity_reduction_per_cycle":"0.10","odds_ratio_vs_25_34":"0.85"},{"age_group":"40-44","fecundity_reduction_per_cycle":"0.20","odds_ratio_vs_25_34":"0.70"},{"age_group":"45+","fecundity_reduction_per_cycle":"0.30","odds_ratio_vs_25_34":"0.60"}] [{"method":"No method","typical_use_failure_rate":"0.85","perfect_use_failure_rate":"0.85"},{"method":"Implant","typical_use_failure_rate":"0.0005","perfect_use_failure_rate":"0.0005"},{"method":"IUD","typical_use_failure_rate":"0.008","perfect_use_failure_rate":"0.002"},{"method":"Injectable","typical_use_failure_rate":"0.04","perfect_use_failure_rate":"0.003"},{"method":"Pill","typical_use_failure_rate":"0.07","perfect_use_failure_rate":"0.003"},{"method":"Patch","typical_use_failure_rate":"0.07","perfect_use_failure_rate":"0.003"},{"method":"Ring","typical_use_failure_rate":"0.07","perfect_use_failure_rate":"0.003"},{"method":"Male condom","typical_use_failure_rate":"0.13","perfect_use_failure_rate":"0.02"},{"method":"Female condom","typical_use_failure_rate":"0.21","perfect_use_failure_rate":"0.05"},{"method":"Diaphragm","typical_use_failure_rate":"0.17","perfect_use_failure_rate":"0.06"},{"method":"Spermicide","typical_use_failure_rate":"0.21","perfect_use_failure_rate":"0.18"},{"method":"Withdrawal","typical_use_failure_rate":"0.20","perfect_use_failure_rate":"0.04"}] [{"day_relative_to_ovulation":"-5","conception_probability":"0.05"},{"day_relative_to_ovulation":"-4","conception_probability":"0.13"},{"day_relative_to_ovulation":"-3","conception_probability":"0.27"},{"day_relative_to_ovulation":"-2","conception_probability":"0.30"},{"day_relative_to_ovulation":"-1","conception_probability":"0.30"},{"day_relative_to_ovulation":"0","conception_probability":"0.30"},{"day_relative_to_ovulation":"+1","conception_probability":"0.00"}] [{"frequency_per_week":"<1","fecundity_per_cycle":"0.10","odds_ratio_vs_1_time":"1.0"},{"frequency_per_week":"1-2","fecundity_per_cycle":"0.15","odds_ratio_vs_1_time":"1.50"},{"frequency_per_week":"3-4","fecundity_per_cycle":"0.20","odds_ratio_vs_1_time":"2.00"},{"frequency_per_week":"Daily","fecundity_per_cycle":"0.25","odds_ratio_vs_1_time":"2.50"}] [{"bmi_range":"<18.5 (underweight)","fecundity_reduction_per_cycle":"0.20","odds_ratio_vs_18_5_24_9":"1.50"},{"bmi_range":"18.5-24.9 (normal)","fecundity_reduction_per_cycle":"0.00","odds_ratio_vs_18_5_24_9":"1.0"},{"bmi_range":"25-29.9 (overweight)","fecundity_reduction_per_cycle":"0.10","odds_ratio_vs_18_5_24_9":"1.20"},{"bmi_range":"30-34.9 (obese class I)","fecundity_reduction_per_cycle":"0.20","odds_ratio_vs_18_5_24_9":"1.50"},{"bmi_range":"35-39.9 (obese class II)","fecundity_reduction_per_cycle":"0.30","odds_ratio_vs_18_5_24_9":"1.80"},{"bmi_range":">=40 (obese class III)","fecundity_reduction_per_cycle":"0.40","odds_ratio_vs_18_5_24_9":"2.00"}] [{"status":"Nonsmoker","cigarettes_per_day":"0","fecundity_reduction_per_cycle":"0.00","odds_ratio_for_infertility":"1.0"},{"status":"Light smoker","cigarettes_per_day":"1-10","fecundity_reduction_per_cycle":"0.10","odds_ratio_for_infertility":"1.30"},{"status":"Moderate smoker","cigarettes_per_day":"11-20","fecundity_reduction_per_cycle":"0.20","odds_ratio_for_infertility":"1.60"},{"status":"Heavy smoker","cigarettes_per_day":">20","fecundity_reduction_per_cycle":"0.30","odds_ratio_for_infertility":"2.00"}] [{"drinks_per_week":"None","fecundity_reduction_per_cycle":"0.00","odds_ratio_vs_nondrinker":"1.0"},{"drinks_per_week":"1-5 (light)","fecundity_reduction_per_cycle":"0.05","odds_ratio_vs_nondrinker":"1.10"},{"drinks_per_week":"6-10 (moderate)","fecundity_reduction_per_cycle":"0.15","odds_ratio_vs_nondrinker":"1.30"},{"drinks_per_week":">10 (heavy)","fecundity_reduction_per_cycle":"0.25","odds_ratio_vs_nondrinker":"1.60"}]

Your Results

The estimated chance of getting pregnant in a month (per menstrual cycle) is about {result}%. The estimated chance of getting pregnant from one act of intercourse is about {result}%.