How Do I Center the Navbar Toggler?

I know how to center the group of navbar menu items, but not the toggler icon itself. I know I’m missing something totally basic!

If you have a navbar-brand
5ch is the count of letters

.navbar-toggler {
  position: absolute;
  margin-left: calc(100vw / 2 - 5ch);
}

if you have an image as your navbar-brand
50px is the width of the image

.navbar-toggler {
  position: absolute;
  margin-left: calc(100vw / 2 - 50px);
}

if you don’t have a navbar-brand

.navbar-toggler {
  margin: o auto;
}

That did the trick. Thank you!