Handy Conversion Factors

ppm   % Volume
1,000,000 = 100
100,000 = 10
10,000 = 1
1,000 = 0.1
100 = 0.01
10 = 0.001
1   0.0001
     
ppb   ppm
1,000 = 1
100 = 0.1
10 = 0.01
1 = 0.001
     
ppt   ppm
1,000 = 0.001
100 = 0.0001
10 = 0.00001
1 = 0.000001
     
ppt   ppb
1,000 = 1
100 = 0.1
10 = 0.01
1 = 0.001