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Period Forecaster, Early Pregnancy Test Calculator

Use your ovulation date to get a more precise forecast of when your next period will start - in many cases the exact period start date even if your menstrual cycle varies! Also shows if your period is late, and, optionally, timelines when to take home pregnancy tests.

This period calculator can be very accurate but you need to have ovulated in this cycle (more below), and the forecast is for your next menstruation start date, not future predictions beyond that.

Calculate Next Period Based On:

Date You Ovulated:
Your average menstrual cycle length: days.
Your luteal phase length: days.
Today's Date:
Include Pregnancy Test Dates:
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Not a member? Join now to use this and many more free calculators and trackers!

Detecting Ovulation


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Period Calculator Fields
Luteal Phase Length - Luteal Phase is the number of days between ovulation and when your next period starts. If you're a logged in MyMonthlyCycles member, your luteal phase setting in My Preferences fills in.

How to calculate Luteal Phase Length? With MyMonthlyCycles's Enhanced Fertility Tools, your average luteal phase length is calculated based on your ovulation tracking, and you can update preferences for retrieval on this calculator.

You can also use Mymonthlycycles luteal phase calculator, which can calculate using a previous menstrual cycle stats.

Average Menstrual Cycle Length - This is the average number of days your cycle lasts. If you are a logged in member, your cycle length fills in based on your period tracking calendar.

Ovulation Date - Enter the date you ovulated during your current menstrual cycle.

How do I know when I've ovulated?

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There are several ways to help determine when you ovulated:

  1. Basal Body Temperature (BBT)
    BBT, your waking temperature, can detect when you've ovulated. BBT can not be used to determine in advance when you will ovulate during your cycle. That's because BBT is a retrospective marker of ovulation -- good news for determining when you did ovulate.

    After a thermal shift upward (of typically 4/10ths of a degree), which remains elevated for several days, ovulation has generally already occurred. If your chart's pattern shows the sustained BBT rise, ovulation most likely occurred the day before the rise. The amount of the thermal shift can vary, which is why tracking and charting your BBT over several months helps you see your patterns.

    Track BBT free at MyMonthlyCycles. With Enhanced Fertility, chart BBT to help identify ovulation, and more!
  2. Observing Cervical Fluid (CF)
    Cervical Fluid changes throughout your fertility cycle, going from dry and almost non-existent following your period, to a creamier consistency as you progress through your follicular phase. As you near ovulation, CF generally becomes more abundant with a slippery texture (EWCM - egg white cervical mucus). EWCM is alkaline, providing the ideal hosting and transport environment for sperm.

    EWCM is also your body's way of telling you ovulation is about to occur. Immediately following ovulation, cervical fluid decreases and starts to dry up again. When this happens, you've likely just ovulated!

    Daily CF Tracker free at MyMonthlyCycles. With Enhanced Fertility, track all cervical signs and see your ovulation pattern charts!
  3. Monitors, Scopes, OPKs
    Yet another way to determine when you ovulate is by using fertility monitors, ovulation microscopes, and/or ovulation prediction tests kits (OPKs).

    For example, OPKs detect the LH surge in your urine, which happens about 24-36 hours before ovulation, thereby giving you excellent advance notice that ovulation is about to occur and, therefore, a simple marker of when you ovulate (i.e. 24-36 hours after the LH surge).
  4. Secondary Ovulation Indicators - Often used with the primary fertility detectors above, but not stand-alone.
    Mittelschmerz - Some women experience mittelschmerz: pain that occurs during ovulation in the lower abdomen, on the same side as the ovary that ovulates that month's egg. If you're a mittleschmerzer, it's your body announcement: I'm ovulating!

    Cervical Firmness, Position, Opening - The cervix changes throughout your menstrual cycle; at ovulation time, it's generally softer, higher, and more open, certainly making it easier for sperm to travel through it.
To pinpoint when you ovulate, you might want to use several, or all, of the above ovulation detection methods. If, for example, your cervical mucus is EWCM, indicating ovulation is about to occur, watch your BBT chart closely for several days to determine if your BBT has risen and stays elevated; Similarly, if your ovulation prediction test detects the LH surge and you are simultaneously observing EWCM, each of these two primary ovulation signs validates the other.
Disclaimer: We make no guarantee that your period, fertile days, and/or when home pregnancy tests might be effective, will occur on the predicted dates, since each person's menstrual and fertility cycles can vary in any given monthly cycle for a variety of reasons. All information provided herein is for informational purposes only. It is not intended as a substitute for advice provided by a medical doctor or qualified healthcare provider. No guarantee is made about the accuracy, completeness, or relevance of the information contained herein.
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Fertility Links

Free Fertility Tracker - Manage each phase of your fertility cycle with MyMonthlyCycles free fertility tools. Track daily fertility signs, OPKs, pregnancy tests, more. Not a member? Register now
Free Fertility Charting - BBT Charts, fertility cycle trend charts(e.g. luteal vs. follicular phase charts), fertility reports, Fertility Chart Room to discuss your charts.
Ovulation Detectors - From ovulation prediction tests, to saliva scopes and advanced fertility monitors providing daily fertility status, your choices are extensive, simple to use, and highly accurate!
MyMonthlyCycles Luteal Phase Calculator - Not sure what your luteal phase is? Easily calculate now...
Advanced Ovulation Calculator at WhenMyBaby.com - ovulation calendar forecasts your entire fertility window, based on your cycle variations (shortest to longest), with TTC conception planner.
Ovulation Prediction Test Kit Calculator at WhenMyBaby.com - Calculate when to use your ovulation tests this cycle, with a chart to track your OPK test results! Works for many popular ovulation predictors.
MyMonthlyCycles Mobile Ovulation Calculator - get your ovulation and fertile days forecast from your iPhone, Adroid, or other web-enabled mobile device. Mobile fertility tracker too!
MyMonthlyCycles Menstrual Calculator - For a longer term projection of your future periods (up to 18 months in advance) calculated based on your last period and average cycle length.
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