I estimate, round to nearest dollar, add a dollar or two if that makes dividing by people easier. What you were doing is easy for you, so it seems to me like a good way for to do do it.
I'm not using weird to mean bad. I'm using it to mean odd.
A story that would fit better with another comment, since you're talking about tipping generously, but that might illustrate what I find odd about being too precise: I went to dinner with a bunch of friends before a play a few weeks ago. When we got the bill, it was close enough to $20 each that I didn't see a point in working it out exactly. A friend's husband pulled out his calculator and said, "but everyone put in $1.30 too much. The tip is too high." There were a lot of us, arriving at different times. Our server had worked hard. We still had to get to the theatre. I said, "I don't need change, and I would like to get to the play on time." He decided not to press it. If he had wanted to stay for his change, I would not have stopped him; however, I was not going to risk missing the beginning of my friend's play, her first time in a lead Shakespearean role, because of $1.30. Also, I don't see leaving a generous tip as a bad thing, even if the service wasn't exceptional, unless the waiter was hostile or abusive.
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I estimate, round to nearest dollar, add a dollar or two if that makes dividing by people easier. What you were doing is easy for you, so it seems to me like a good way for to do do it.
I'm not using weird to mean bad. I'm using it to mean odd.
A story that would fit better with another comment, since you're talking about tipping generously, but that might illustrate what I find odd about being too precise:
I went to dinner with a bunch of friends before a play a few weeks ago. When we got the bill, it was close enough to $20 each that I didn't see a point in working it out exactly. A friend's husband pulled out his calculator and said, "but everyone put in $1.30 too much. The tip is too high." There were a lot of us, arriving at different times. Our server had worked hard. We still had to get to the theatre. I said, "I don't need change, and I would like to get to the play on time." He decided not to press it. If he had wanted to stay for his change, I would not have stopped him; however, I was not going to risk missing the beginning of my friend's play, her first time in a lead Shakespearean role, because of $1.30. Also, I don't see leaving a generous tip as a bad thing, even if the service wasn't exceptional, unless the waiter was hostile or abusive.