Mark Rober has about 86.3 million YouTube subscribers, 77.8 million more than John Casterline, as of Nov 13, 2026. At the 30-day pace, John Casterline would not catch up.
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Mark Rober, with about 86.3 million YouTube subscribers to John Casterline's 8.52 million, a gap of 77.8 million as of Nov 13, 2026.
Never at the current pace. Mark Rober is growing faster than John Casterline over the last 30 days, so the gap widens by about 85.9K subscribers a day.
Over the last 30 days, Mark Rober gains about 87.8K subscribers a day and John Casterline gains about 1.91K subscribers a day.
