Meghan Markle has kept her due date a secret, but these six pictures shows exactly when we can expect the pitter patter of royal baby feet, Daniela Elser.

Okay team. Let's get our calculators out, because today we are going to crunch some very important numbers.

That's right, we are going to work out when the Duchess of Sussex is most likely to give birth. (I promise, no algebra will be involved.) Because, if Kensington Palace won't give us a date, I'll bloody try and work it out for myself.

See, this week the Duchess, along with a slew of other senior royals, donned their best colourful coats and trotted along to Westminster Abbey to celebrate Commonwealth Day. Meghan opted for a $16,000 outfit, because, why not? She's a goddamn royal and has all of that Duchy of Cornwall coin to spend.

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There, she was seen greeting her sister-in-law and partner in persistent feud speculation, the Duchess of Cambridge, with a peck on the cheek and reportedly teared up during one particularly moving musical number.

Harry and Meghan arriving for her last official engagement before she gives birth. Photo / AP
Harry and Meghan arriving for her last official engagement before she gives birth. Photo / AP

All in all, a busy day for the newest member of Team Windsor.

However, according to reports, the service was most likely Meghan's last official public engagement before her baby arrives.

Now, Kensington Palace has never officially confirmed when the former Suits star is likely to pop (that's the technical term, right?). Unlike Kate's pregnancies, when they at least offered up at a vague time frame of when the newest royal sprog was set to appear, with Meghan, it has been something of a very frustrating guessing game for those of us who spend an unnecessary amount of time thinking about the royals.

It is widely rumoured that Meghan will give birth some time around the end of April, and comments she herself has made when mingling with the public have support this timetable. However, it is all pretty much conjecture.

So, let's do some cold, hard calculations and use maths to try to answer this vexing question, or at least make an educated guess at it.

Let's assume the best template we have to work off here is Kate and figure out how long between her last official engagement and each of the deliveries of her three wee HRHs.

GEORGE

Kate at her last official engagement before George's arrival. Photo / AP
Kate at her last official engagement before George's arrival. Photo / AP

Firstly, with Prince George, Kate's final public event was the Trooping the Colour on June 15, 2013, before he arrived on the 22nd of July, 2013. Total — 37 days gap.

Kate 37 days later with freshly-born George. Photo / Getty Images
Kate 37 days later with freshly-born George. Photo / Getty Images

CHARLOTTE

Kate's last appearance before Princess Charlotte was born. Photo / Getty Images
Kate's last appearance before Princess Charlotte was born. Photo / Getty Images

In 2015, Kate and Wills visited the Stephen Lawrence Trust on March 27, before Princess Charlotte popped out on May 2, giving Kate 36 days off.

And 36 days later with newborn Princess Charlotte. Photo / Getty Images
And 36 days later with newborn Princess Charlotte. Photo / Getty Images

LOUIS

Kate's last engagement before giving birth to Louis. Photo / Getty Images
Kate's last engagement before giving birth to Louis. Photo / Getty Images

Finally, with Prince Louis, Kate appeared at a mental health symposium on March 22, 2018 and then he entered the world on April 23, which is 32 days difference.

And with Louis 32 days later. Photo / Getty Images
And with Louis 32 days later. Photo / Getty Images

- Daniela Elser is a royal expert and freelance writer.