Metrics Conversion. METS vs Watts

Thanks
Powermeters want to read in Watts and the Watts to Mets relationship and conversion is throwing me .
When I use:
Multiply Watts by 0.0143 to get kcal/min.
Divide kcal/min by 5.05 to get litres of O2/min.
Divide litres of O2/min by bodyweight in kg (pounds ÷ 2.2) to get mL/kg/min.
Divide mL O2/kg/min by 3.5 to get METs.
I am getting 0.0010470089 METS for 100w
And am having trouble finding my error

Using an online calculator with 100w 170lbs 10 min I get 6 METS which seems about right