Daisycle Menstrual & Pregnancy Calculator Tools

Take control of your reproductive health with Daisycle’s easy-to-use calculators. These tools give helpful estimates based on the info you provide—great for planning and staying informed.

Important: Results are educational estimates, not medical advice or contraception. Cycles vary (illness, stress, travel, postpartum, PCOS, perimenopause). If something feels off, speak with a clinician.

Period Calculator

What it does: Estimates your next period window and typical cycle length based on your recent history.
You enter:

• First day of your last period (LMP)

• Your average cycle length (e.g., 28 days—adults commonly range 21–35)

Outputs you’ll see:

• Expected next period start window

• Cycle length trend if you’ve logged multiple cycles

Good to know: Predictions improve as you log consistently. Irregular cycles reduce accuracy.

Ovulation & Fertile Window Calculator

What it does: Estimates your likely ovulation day and fertile window for conception.
You enter:

• LMP (first day of last period)

• Average cycle length

Outputs you’ll see:

• Estimated ovulation day

• Fertile window (the few days before ovulation + ovulation day)

Good to know:

• Apps cannot confirm ovulation. Confirmation typically requires ovulation tests (LH), basal body temperature patterns, or progesterone blood tests.

• Sperm can survive up to ~5 days; the egg lives ~12–24 hours, so timing matters.

Pregnancy Due Date (EDD) Calculator

What it does: Estimates your due date.
You enter:

• LMP or known conception/ovulation date

Outputs you’ll see:

• Estimated EDD (by LMP, ~40 weeks / 280 days)

• Equivalent gestational week today

Good to know:

• An early ultrasound may adjust the date and is often more precise than LMP (especially with irregular cycles).

• The due date is a target, not a deadline—many births occur before or after that day.

Implantation Calculator

What it does: Estimates the likely implantation window after ovulation.
You enter:

• Ovulation date (estimated or from LH/BBT)

Outputs you’ll see:

• Typical implantation window (~6–10 days post-ovulation, range ~5–12)

Good to know:

• Implantation can’t be directly measured at home.

• “Implantation bleeding” is not reliable and many do not experience it.

Pregnancy Test Timing Calculator

What it does: Suggests the best day to test based on when hCG is most detectable.
You enter:

• Expected period date or ovulation date

Outputs you’ll see:

• Recommended test date (often on/after missed period or ~14+ days post-ovulation)

• Guidance to retest after 48 hours if early negative and no period

Good to know:

• Testing too early increases false negatives.

• If you have positive test + pain/bleeding, seek urgent care to rule out ectopic pregnancy.

Privacy & Control

• Your inputs are used to generate results; see Settings → Privacy for data controls.

• We don’t sell personal data. Optional analytics or backups are consent-based.

• You can export or delete your data (see our Privacy Policy for details).

When to Seek Care (not a full list)

• Very heavy bleeding (soaking a pad/tampon hourly for ≥2 hours) or large clots

• Severe pelvic/abdominal pain, fainting, fever, or foul-smelling discharge

• No period for ≥3 months (and not pregnant/postpartum/under guidance)

• Positive test with pain/bleeding (rule out ectopic pregnancy)

• Mental health concerns (depression, anxiety, thoughts of self-harm)

Bottom Line

Daisycle’s calculators make planning easier with clear, private, and simple estimates. Use them alongside your own observations—and partner with a clinician for personalized medical advice.