LBLuna Bloom
CalculatorsGuides

A calm monthly guide

Period Calculator and Period Calendar

Use this free period calculator, period calendar, and period predictor to estimate your next period, ovulation date, fertile window, and menstrual cycle timeline in one calm view.

ForecastMay 1

Expected next period

Fertile windowApr 12 - Apr 18

Estimated fertile days

OvulationApr 17

A simple planning anchor

Simple monthly forecast

Period calculator, period predictor, and menstrual cycle calendar

Enter the first day of your last period, then adjust your cycle length and period length for a soft, easy forecast.

Last period start
Friday, April 3, 2026This date starts the full monthly rhythm.
Cycle length28 days
Period length5 days
Next periodMay 1

Expected next period

Ovulation dayApr 17

Highest-focus cycle anchor

Fertile startApr 12

Day 10 in your cycle

Fertile endApr 18

Day 16 in your cycle

Cycle map

28 days visible days
PeriodFertile windowOvulation
Days 1-5Period window
Days 10-16Fertile window
Day 15Ovulation
3456789101112131415161718192021222324252627282930

Educational planning tool. A licensed clinician adds the right support for symptoms, fertility care, and missed periods.

Cycle rhythm

A softer way to understand the whole month.

Days 1-5

Period

Warm meals, softer routines, and a little extra rest often feel lovely in the opening days of the cycle.

Days 6-13

Follicular

Energy often rises here. It is a sweet window for planning, movement, and a little more social energy.

Day 14

Ovulation

This date helps estimate the fertile window and gives the whole month a clear anchor point.

Days 15-28

Luteal

A slower rhythm often feels best here. Sleep, mood, skin, and cravings can become more noticeable.

Monthly planning

See your next period, period calendar, ovulation, and cycle length in one monthly view.

Start with the full forecast, then open the date, late-period, ovulation, or tracker page that fits your question.

K1

Period calendar

Use the monthly forecast and cycle map as a period calendar with clear dates for your next period, fertile window, and ovulation.

K2

Calculate next menstrual period

Use your last period start date and usual cycle length to see the next menstrual period estimate more clearly.

K3

Menstrual cycle period calculator

Understand what gets counted from one period start date to the next, then reuse that number for planning.

Why it feels easy

Use the monthly forecast to plan travel, workouts, reminders, and everyday routines with less guesswork.

Travel plans

A quick forecast helps with holidays, weddings, workouts, and any moment where timing brings more ease.

Body notes

A calm monthly view makes it easier to track cramps, skin, mood, and the small patterns that matter.

Next steps

Ovulation, due date, and irregular-cycle tools are close by when your question needs a more specific answer.

Next steps

Choose the period, ovulation, or cycle tool that matches what you need next.

01

Is my period late calculator

Compare today with your expected period date and see whether this cycle is still on time or already late.

02

Cycle calculator

Measure your monthly rhythm and use that cycle length to make the next forecast easier to understand.

03

Late period calculator

Check whether your period is due today, still a few days away, or already late from the main late-period landing page.

04

Ovulation calculator

Focus on ovulation timing, fertile days, and the next period in one clearer flow.

05

Irregular period calculator

Estimate the next period window when your cycle length shifts month to month.

Browse all calculatorsBrowse all guides

FAQ

Short answers that keep the page calm and clear.

How does this period calculator estimate the next cycle?

The tool adds your average cycle length to the first day of your last period. Ovulation is estimated around 14 days before the next period, which also shapes the fertile window.

What if my cycle length changes month to month?

Irregular patterns benefit from a range view. A future version can save several cycles and build a more personal estimate.

Who is this page for?

It works well for anyone who wants a gentle monthly forecast and for teams building a warm health tool around cycle planning.

How should medical guidance fit into the experience?

This page works best as an educational planning tool. A licensed clinician adds the right support for symptoms, fertility questions, or missed periods.

Is this also a period calendar or period predictor?

Yes. The same page works as a period calendar and period predictor because it maps your next period, fertile window, and ovulation timing onto one monthly timeline.

Can I use it like a menstrual cycle calculator each month?

Yes. Enter the first day of your last period and your usual cycle length, then use the monthly map as a simple menstrual cycle calculator for planning.

Can I use it for period date and menses timing questions?

Yes. Those questions usually need the same core answer: when the next period may start, how the cycle is moving, and which dates matter most this month.