Periods are at best a mild inconvenience and at worst a serious monthly interruption to people's day-to-day lives, but what really takes the cake is the amount we have to pay for the privilege.
The average period-haver will shell out a small fortune over their lifetime on the supposed "luxury" items needed to deal with them - pads, tampons, pain killers and panty liners.
New research has revealed that British women spend as much as £18,450 on their periods over the course of their lifetime and some unscientific equations by The Herald put the spend for Kiwis at just under $16,000.
Using Countdown prices, we broke down the cost of tampons, panty liners, new undies (for when you're caught off-guard), pain relief, chocolate and chips, and other treats (in this case a magazine), by month.
A monthly estimated cost of $35.43, multiplied by the average 450 periods someone will have in their lifetimes totals a whopping $15,944.