Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Conception Date Calculator

Estimates how many days ago conception occurred from a reference point — your due date, last menstrual period, or an ultrasound dating scan — entered as days since that reference (negative if it is a future due date).

Calculate From

Days Since Reference Date (use a negative number for a future due date) (days)

Cycle Length (days)

Ultrasound Gestational Age (weeks)

Fill in the required fields to see your result.

Pregnancy

Maternity Leave Calculator

Estimate total paid maternity leave income by combining statutory benefit payments with any employer top-up. Use it when planning finances before taking parental leave.

Weekly Salary ($)

Total Leave Weeks (weeks)

Paid Leave Weeks (weeks)

Benefit Payment Rate

Employer Top-Up Benefits

Fill in the required fields to see your result.

Key differences

	Conception Date Calculator	Maternity Leave Calculator
Category	Pregnancy	Pregnancy
Inputs required	4	5
Result	Estimated Conception	Total Paid Benefits ($)
What it does	Estimates how many days ago conception occurred from a reference point — your due date, last menstrual period, or an ultrasound dating scan — entered as days since that reference (negative if it is a future due date).	Estimate total paid maternity leave income by combining statutory benefit payments with any employer top-up. Use it when planning finances before taking parental leave.