Step 1
How many weeks?
Pregnancy Calculator
See weeks, days, trimester and key milestones.
Open toolStart from a goal
🤰 Pregnancy
Weeks, due dates and healthy weight gain
Dating and milestones are estimates. Your midwife or dating scan may adjust them. Contact your midwife or GP with any concerns. Online tools are guidance only.
Map your pregnancy dates
Work from your last period through weeks and due date, then optional conception timing and weight gain guidance.
-
1
-
2
Step 2
Estimated due date
Due Date Calculator
Calculate the usual LMP based due date.
Open tool -
3
Step 3
Conception window
Conception Calculator
Work backwards from a due date if you need timing context.
Open tool -
4
Step 4
Weight gain guidance
Pregnancy Weight Gain Calculator
Healthy gain ranges for your pre-pregnancy BMI.
Open tool
All tools
Browse every calculator in this journey. The steps above are a suggested order.
Pregnancy Calculator
How many weeks pregnant you are and key milestones.
Use calculatorDue Date Calculator
Estimated due date from the first day of your last period.
Use calculatorConception Calculator
Approximate conception date from your due date or LMP.
Use calculatorPregnancy Weight Gain Calculator
Healthy weight gain guidance during pregnancy (stone and lbs).
Use calculatorOvulation Calculator
Estimate your most fertile days this cycle.
Use calculatorPeriod Calculator
Predict your next period and fertile window.
Use calculatorPregnancy Caffeine Calculator
Add caffeine milligrams and compare with common NHS pregnancy guidance of about 200 mg a day.
Use calculator