I am using DBS Altitude (used with DBS Multiplier), Citi Rewards (for shopping) and HSBC Revolution (for dining). I would like to convert these to miles in future. Is this ok?

If your spending on CC is huge, converting to miles is typically what people do if they have intention of getting a biz flight or first class. You can refer to other articles write up on the calculation. For economy class the ratio is not that worthwhile comparing to biz/1st class.

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In summary, yes, converting CC points to miles is good only:

1) High spending on CC ($xxxx per month)

2) Redeeming Biz or First class.

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my 2 cents.