That’s a very clear image of a Conception Calculator interface!

Based on the image and the accompanying text, here is a summary of what a conception calculator does, what inputs it needs, and how it works:

Conception Calculator Summary

1. What It Does

A Conception Calculator is a digital tool that estimates:

• The likely date when conception occurred (when the sperm met the egg).
• The estimated Due Date for the baby.

2. Required Inputs (as seen in the image)

To use the calculator based on the Last Menstrual Period (LMP) method, you need two pieces of information:

Input	output
First Day of Last Period	The start date of your last menstrual period (LMP).
Average Cycle Length (days)	The average number of days your cycle typically lasts (e.g., 28 days).

3. How It Works (Based on LMP)

The calculator uses the first day of your last period and your cycle length to estimate your ovulation date.

• Conception typically happens approximately 11–21 days after the first day of your last period begins.
• Once the Conception Date is estimated, the Due Date is calculated by adding 266 days (or 38 weeks) to the estimated conception date.

4. Other Calculation Methods

The provided text mentions you can also calculate conception based on:

• Due Date: Subtract 38 weeks (266 days) from the known due date.
• Ultrasound Results: An early ultrasound (5–8 weeks) measures the fetus for the most accurate estimate of gestational age.