Convert hours to minutes: quick method and examples
Quick answer: Multiply hours by 60 to convert to minutes, and divide minutes by 60 to convert back. For example, 2.5 hours is 150 minutes.
Convert hours into minutes
Multiply the hours by 60. For example, 3.25 hours is 195 minutes.
Convert minutes into hours
Divide the minutes by 60. Ninety minutes is 1.5 hours, which is 1 hour 30 minutes.
Avoid confusing decimal hours with minutes
The digits after a decimal point represent a fraction of an hour, not clock minutes. Convert that fraction by multiplying it by 60.
Source & methodology
The UK National Physical Laboratory documents SI units and accepted time units used alongside the SI.