Zero. I tend not to carry change; the vast majority of the time I’m paying cash for something, it’s while I’m in my car, and the change stays in the car.
There’s some change on my desk at work. There’s some change in the car. Nowhere else. Sometime’s there’s change in my pocket just after a purchase, but I unload at or before the end of the day. Sometimes it sits on my desk at home for a bit, but it usually sorts into my desk at work (work - where the vending machine lives), the car, or donated to my son who rolls coins.
Nothing directly on me at this exact moment. I pick up pennies, so I usually have at least a few cents; today is an unusually penny-free day.
On the other hand, I have a couple of bucks in the cushions of my couch, about $20 in quarters sitting in my “laundry money bowl” by the front door, about $50 of unrolled change in a jar right next to it, $10 or so in my car for drive throughs and toll roads, and several hundred dollars in rolled change sitting in a chest in my library. I could probably scrounge another $20 or so by going through laundry baskets, drawers, clothes hamper, and anywhere else that change tends to fall… so even though I have no change directly on me, I have quite a bit within a few dozen feet.
I only empty my purse when it gets too heavy for me. I dump the change at the bottom. If the beggar had asked me I wouldn’t have answered because counting the change in my purse entails my dumping it out, opening all the pockets, and then counting it.