analyticsScience-Backed Calculator

Ovulation Window Calculator

Project ovulation day and fertile window from last period and cycle length.

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Clinical Accuracy

Grade A

Cycle Parameters

Days
Period ends ~3 November 2026
Fertile 7 November 2026 – 13 November 2026
Ovulation ~12 November 2026

Cycle Calendar

November 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12OVULATION
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Period
Fertile Window
Predicted Ovulation
Today

Current Status

Peak Fertility

Cycle day 11 of 28. Estrogen is high and ovulation is imminent.

Optimal Performance Window

Conception Probability

68%High

Based on cycle day 11 of 28

Daily Reminders

Track Cervical Mucus

Key indicator for peak window accuracy.

Log Basal Body Temp

Last optimal reading: morning before rising.

Prenatal Vitamin

Daily dosage supports cycle health.

Athlete training
Training Insight: Ovulatory Phase

Max Power Window

Physiology

Oestrogen at its peak. Increased ligament laxity; mindful of joint stability during heavy lifts.

Target Workouts

High-intensity intervals (HIIT), sprint work, or setting new Personal Bests.

Metabolism

Slightly increased basal metabolic rate. Prioritise complex carbs for sustained energy.

Injury Risk

Elevated (ACL)

Energy Level

Maximal

View Full Training Plan

Avg Cycle Length

28 days

Luteal Phase

14 days

Fertile Window

6 days

Cycle Progress

11 / 28

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Research Reference

biotechScientific Method

Ovulation day is approximated as cycle length minus 14, with a fertile window spanning five days before ovulation plus ovulation day.

Stanford JB et al. (2002)

Obstet Gynecol.

PMID: 12220768Read paperopen_in_new
Medical Disclaimer: This calculator provides estimated dates based on average cycle patterns. It is not a substitute for clinical guidance or a medical diagnosis. Always consult your gynecologist for fertility planning.