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The Royal Wedding by the Numbers

Prince William and Kate Middleton

Royal Arithmetic!

Friday's royal wedding will mark the first large-scale nuptials that the world has seen since Prince Charles and the late Princess Diana tied the knot nearly 30 years ago. So whether you've been following the details since Prince William, 28, and Kate Middleton, 29, announced their engagement on Nov 16, 2010 or you're just tuning in now, here are some staggering facts and figures about the historic day.

2 billion viewers are expected to tune in for the wedding

50 million GBP (British pounds) in revenue, which consumers are expected to spend on paraphernalia and other celebratory favors

PHOTOS: The craziest royal wedding souvenirs

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$34 million, the estimated price tag of the big day

1.1 million tourists estimated to be visiting London just for the wedding

600,000 spectators that are estimated to line the procession streets from Westminster Abbey to Buckingham Palace

$398,000, the current estimated value of Middleton's engagement ring

28,000 wilted tulips that were cut down in front of Buckingham Palace due to a bout of warm weather that caused the flowers to prematurely bloom

10,000 flowers that will be decorating Buckingham Palace and Westminster Abbey

PHOTOS: Prince William and Kate Middleton around town

10,000 hot and cold canapes offered to guests at the Queen's lunch reception following the ceremony

8,000 security cameras that will be keeping watch at the event

5,500 street parties estimated to take place throughout the UK in celebration of the wedding

5,000 security personnel on site

1,900 guests invited to the Westminster Abbey service

1,700 Rich Tea biscuits that have been used to create Prince William's specially requested chocolate "groom's cake"

PHOTOS: A look back at William and Kate's romance

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650 guests invited to the Buckingham Palace lunch reception hosted by the Queen

300 guests invited to the dinner hosted by Prince Charles

187 groomed horses that will march in the procession leading to Buckingham Palace

80 tiaras that Middleton had to choose from to wear on her wedding day

50 members of the royal family who will be in attendance

40 foreign royals who have been invited to the wedding

PHOTOS: Kate's princess prep

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29, the age of Middleton, who is the oldest (non-divorced) bride to ever marry into the royal family

18 carats, the weight of Middleton's sapphire engagement ring, which once belonged to the late Princess Diana

9 years, the length of the royal couple's relationship, which began at the University of St. Andrews in 2001

8 bridesmaids and pageboys (plus maid and man of honor) in the bridal party

8 trees (six English field maples and two hornbeams) that will reportedly decorate the aisle of Westminster Abbey

6 figures, the sum reportedly contributed to the royal wedding by Middleton's parents Carole and Michael

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