HealthCalc Hub

Due date for a last period in July

Enter your last period start date to get a due date. This page is set up for July. The table below covers each day from day 1 to day 31.

Pick a date to see your due date.

This calculator gives general information only. It is not medical advice. Talk to a doctor or other qualified health professional about your own health.

How it works

Count 280 days forward from the first day of the last period. The result is the estimated due date. On this page day 15 maps to 21 April.

Worked example

Start at 15 July. Count 280 days ahead to reach 21 April. Across the whole month the due dates run from 7 April to 7 May. This example assumes a 365-day year.

Estimated due date for each day of July, counting 280 days from the first day of the last period. The table uses a 365-day year.

First day of last periodDue date
1 July7 April
2 July8 April
3 July9 April
4 July10 April
5 July11 April
6 July12 April
7 July13 April
8 July14 April
9 July15 April
10 July16 April
11 July17 April
12 July18 April
13 July19 April
14 July20 April
15 July21 April
16 July22 April
17 July23 April
18 July24 April
19 July25 April
20 July26 April
21 July27 April
22 July28 April
23 July29 April
24 July30 April
25 July1 May
26 July2 May
27 July3 May
28 July4 May
29 July5 May
30 July6 May
31 July7 May

Common questions

How reliable is a due date worked out by month?

It is an estimate, and births spread across the weeks around it. A last period on day 15 of July gives 21 April, with arrivals spread across the weeks around that date.

Which month will my baby be born?

The due date month is a guide, and many births come earlier or later. A last period in July points to April and May.

What if I only know the month?

Use the middle of the month. The due date then falls in the middle of the window. Day 15 of July maps to 21 April.

How many weeks is the gap?

Divide the days by 7 to get weeks. From day 1 of July to 7 April is 280 days, which is 40 weeks.

What if my cycle is not regular?

When cycles are irregular, an ultrasound can date a pregnancy more reliably than a calendar. A date of 15 July would then give 21 April only as a first guess.