Pregnancy Formula: Due Date ~= Date of Conception + 266 days

Pregnancy Definition The Pregnancy Calculator is an easy tool to use for calculating approximately when your pregnancy will be based on the date of your last period. The free online pregnancy calculator is extremely easy to use. All you have to do is enter in the date of your last period and then press calculate!

How to Calculate Pregnancy Let's be honest - sometimes the best pregnancy calculator is the one that is easy to use and doesn't require us to even know what the pregnancy formula is in the first place! But if you want to know the exact formula for calculating pregnancy then please check out the "Formula" box above.