Simple tools with a modern medical-style experience
Use the calculator for an estimated due date, then explore pregnancy week information and other tools. Decorative visuals are CSS-based, so no API key is required.
Estimate your pregnancy due date in seconds
Enter the first day of your last menstrual period and your average cycle length. The calculator gives an estimated due date without requiring any API key.
Enter LMP
Select the first day of your last period.
Set Cycle
Choose your average menstrual cycle length.
Calculate
View the estimated due date instantly.
Pregnancy Due Date Calculator
Enter the first day of your last menstrual period (LMP) and your usual cycle length to estimate your pregnancy due date.
How the Due Date Estimate Works
A common pregnancy dating method starts with the first day of the last menstrual period and estimates about 40 weeks of pregnancy. This calculator also adjusts the estimate when the selected menstrual cycle length differs from 28 days.
First Trimester
The first trimester covers the early stage of pregnancy. Prenatal care and accurate pregnancy dating are especially useful during this period.
Second & Third Trimesters
Pregnancy progress is usually followed in weeks. Your clinician may use ultrasound and other clinical information when confirming or revising dating.
Important Medical Note
What does average cycle length mean?
Cycle length is counted from the first day of one menstrual period to the first day of the next. A 28-day cycle is commonly used as the standard reference in due-date calculations.
Start Day
First day of your menstrual bleeding.
Next Period
Count until the first day of the next cycle.
Average
Use your usual cycle length if known.
Understand the 40-week pregnancy timeline
The week-by-week section below helps visitors move through the pregnancy timeline quickly.
First Trimester
Weeks 1–12.
Second Trimester
Weeks 13–27.
Third Trimester
Weeks 28–40.
One website, multiple pregnancy & health calculators
As you add more tools, this section can display them as responsive cards. Each tool can have its own page while the homepage remains clean and organized.
Pregnancy Tools
Add due date, conception, trimester and week calculators.
Health Tools
Add BMI, calorie, hydration and other calculators later.
Easy Layout
Manage tool cards directly in your WordPress page editor.
Clear results with a healthcare information notice
Each calculator result is presented as an estimate. The site provides general educational information while clearly reminding visitors that professional healthcare advice is important.
Designed to grow as you add new calculators
The homepage stays focused on the main pregnancy tool while additional calculators can appear as new cards or pages. This makes the site suitable for a larger tools directory later.
Main Tool
Keep one primary calculator above the fold.
Tool Cards
Show additional calculators in grid cards.
Navigation
Use your WordPress menu to link to other tools.