For publishers
Free Pregnancy Calculator Widgets for Your Website
Keep readers on your page with interactive calculators that need zero development. Midwives, fertility clinics, parenting blogs, and health publishers can embed ClearLine tools in about 30 seconds.
Free for editorial use. Attribution required (Powered by ClearLine Check). Looking for the consumer tools instead? Browse all calculators →
Calculators
Due date, ovulation, fertility, and related cycle tools.
Due Date Calculator
Estimate due date and pregnancy week from LMP, ovulation, conception, or IVF transfer.
Ovulation Calculator
Predict ovulation date and fertile days from cycle length and last period.
Fertility Window Calculator
Show the most fertile days in a cycle with conception probability by day.
Pregnancy Week Calculator
Calculate how far along a pregnancy is and which trimester applies.
Implantation Calculator
Estimate the implantation window and when a test could first turn positive.
Pregnancy Test Calculator
Find the earliest and most reliable day to take a home pregnancy test.
Period Calculator
Predict next period, ovulation, and fertile window from cycle data.
hCG Doubling Calculator
Check whether hCG levels are rising normally between two blood tests.
Test & tracking tools
OPK surge, retest planning, and line progression — great for TTC content.
OPK Surge Predictor
Plot OPK readings and estimate LH surge timing for ovulation prediction.
This widget is taller than basic calculators. Recommended iframe height: 720px or more.
Pregnancy Test Retest Planner
Plan the next retest date after a faint, negative, or unclear result.
Line Progression Checker
Upload and compare pregnancy test photos side-by-side to track line darkening.
Photo upload tool — allow ~800px height and test on mobile. Readers need camera/file access inside the iframe.
Install in one line
<script async src="https://www.clearlinecheck.com/widget.js"></script>
<div data-clearline-widget="due-date-calculator" data-theme="neutral"></div>Open any widget page for a live preview, colour themes, and copy-paste code tailored to that tool.
