I'd say 300-400.
50ish each on OH and 3 kids (200)
Gifts for 10 family members (150)
Me probably underestimating what I've spent (50).
We have a tree and decorations we use every year. Same with stockings.
Lunch is a roast with pigs in blankets, no extra cost as items collected and frozen. I might make a yule log, but that won't cost me much extra as I keep flour/sugar etc.
We don't do tubs of sweets etc. Kids will get chocolate in their stockings, eg chocolate orange/smarties from poundland. We do have £1 chocolate advent calendars.
Christmas jumpers I buy big on ebay and pass down from one child to the next. Didn't have to buy any this year. Kids don't care about them but there is xmas jumper day at school.
We don't always do a paid-for trip out. But we do go to xmas fairs, community craft sessions, trip to see garden centre decorated, late night walk to see xmas lights. Kids love all this, and it's all local so not stressful.
I'm not tight, we've just been on a tight budget for a few years due to having two maternity years close together. But it has definitely meant I've thought about each thing I've paid for, and whether it will actually improve the day or the experience for the kids. Or whether it is just needless rubbish I feel I must buy, for no actual reason!
The gifts I collect all year round, to spread the cost. So I end up with a decent number of gifts for the kids. And in our house santa only brings one gift, and the stocking. All else from us. So not too many unpredictable last minute costs.
In some ways I'd like to be able to spend more, but really it probably wouldn't make it much better. Apart from the occasional show or something.
And thanks to this board, one special treat this xmas will be getting the kids to choose the Christmas dessert at Lidl 