# Free Period & Fertility Calculators

> Free online tools to track your menstrual cycle, predict ovulation, and identify your fertile window. No signup required. Track your cycle for free with our easy-to-use tools. No signup required.

Page: https://period-tracker.org/calculators/

Free online tools to track your menstrual cycle, predict ovulation, and identify your fertile window. No signup required.

## All Calculators

Choose a free tool to understand your cycle, fertility, and reproductive health.

[

### Period Calculator

Calculate your next period date in seconds. Enter your last menstrual period start date, hit calculate, done.

](https://period-tracker.org/period-calculator/)[

### Ovulation Calculator

Find your ovulation date and 6-day fertile window in seconds.

](https://period-tracker.org/ovulation-calculator/)[

### Fertility Calculator

See your fertile window and peak days to get pregnant.

](https://period-tracker.org/fertility-calculator/)[

### Period Cycle Phases

See which phase you're likely in today and what's coming next.

](https://period-tracker.org/cycle-phases-calculator/)[

### Follicular Phase Calculator

See your follicular phase dates, symptoms, and what to eat for optimal energy.

](https://period-tracker.org/follicular-phase-calculator/)[

### Period Calculator for Irregular Periods

Estimate your next period and fertile window, even with irregular cycles.

](https://period-tracker.org/irregular-period-calculator/)[

### Monthly Period Cycle Calculator

Calculate your monthly period cycle and predict your next period date in seconds.

](https://period-tracker.org/monthly-period-cycle-calculator/)[

### Ovulation Day Calculator

Find your estimated ovulation day and peak fertility window based on your cycle data.

](https://period-tracker.org/ovulation-day-calculator/)[

### Safe Days Calculator

Estimate your fertile window and understand how safe days work in your cycle.

](https://period-tracker.org/safe-days-calculator/)[

### Pregnancy Calorie Calculator

Find out how many calories you may need each day during pregnancy.

](https://period-tracker.org/pregnancy-calorie-calculator/)[

### Accurate Period Calculator - Predict Your Next Period Free

Predict your next period date, based on your actual cycle length.

](https://period-tracker.org/accurate-period-calculator/)[

### Period Cycle Calculator

Predict your next period date and understand your menstrual cycle in seconds.

](https://period-tracker.org/period-cycle-calculator/)[

### Period Cycle Length Calculator

Calculate your average period cycle length using your last few periods.

](https://period-tracker.org/period-cycle-length-calculator/)[

### Menstrual Cycle Calculator

Predict your next period and menstrual cycle dates in seconds.

](https://period-tracker.org/menstrual-cycle-calculator/)[

### Period Phase Calculator

Find out which phase of your menstrual cycle you're in right now.

](https://period-tracker.org/period-phase-calculator/)[

### Ovulation After Miscarriage Calculator

Estimate ovulation and your fertile window after miscarriage using your first real period date and average cycle length.

](https://period-tracker.org/ovulation-after-miscarriage-calculator/)[

### Implantation Calculator

Estimate your implantation date and earliest pregnancy test window in seconds.

](https://period-tracker.org/implantation-calculator/)[

### Conception Calculator

Estimate conception timing from the date you know.

](https://period-tracker.org/conception-calculator/)[

### Due Date Calculator

Estimate your baby's due date and current pregnancy week from your last period, ovulation, conception, or ultrasound.

](https://period-tracker.org/due-date-calculator/)[

### IVF Due Date Calculator

Estimate your due date, current pregnancy week, and key milestones from your embryo transfer date and embryo age.

](https://period-tracker.org/ivf-due-date-calculator/)[

### BBT Chart

Log your temperature each morning and watch the pattern form.

](https://period-tracker.org/bbt-chart/)