Does a pregnancy calculator work for irregular periods?
It gives you an estimate. For irregular cycles, the LMP method can be off by days or weeks. Our calculator lets you enter your actual average cycle length to improve accuracy. For the most reliable date, book an ultrasound scan between 8 and 13 weeks.
Medically Reviewed
By Ferty9 Medical Board, at Ferty9 Fertility Center | Last Reviewed: Mar 25, 2026
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