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Info Centre >> Water Treatment Technical Manual >> 2.Conductivity/Total Dissolved Solids >> 2.3 TDS Conversion Values
When working with TDS (Total Dissolved Solids) measurements, there is sometimes a need to convert units. Below are a few common measures and conversions to other units.
1 Grain = 0.0648g (grams) = 64.8mg (milligrams) = 0.00228 oz (ounces)
Convert grains to grams: multiply grains by 0.0648 grains/gram = grams
Convert ounces to grams: multiply ounces by 28.35 grams/ounce = grams
Convert grams to mg (milligrams): multiply grams by 1000 mg/g = mg
Convert mg to ppm in a liquid: divide mg into litters = ppm
Convert ppm to ppt: divide ppm by 1000 ppm/ppt = ppt
Or vice-verse:
Convert ppt to ppm: multiply ppt by 1000 ppm/ppt = ppm
Convert ppm to mg: multiply ppm by litters = mg
Convert mg to grams: divide by 1000 mg/g = grams
Convert grams to ounces: divide grams by 28.35 grams/ ounce = ounces
Convert grams to grains: divide grams by 0.0648 grams/grain = grains
EXAMPLE: Converting grains to ppm and ppt:
5 grains x 0.0648 grains/gram = 0.324 grams
0.324 grams x 1000 mg/g = 324 mg
324 mg ÷ 1 litter = 324 ppm
(if in 2 litters . . . 324 mg ÷ 2 litters = 162 ppm)
(if in 0.5 litters . . . 324 mg ÷ 0.5 litters = 648 ppm)
324 ppm ÷ 1000 ppm/ppt = 0.324 ppt
You may already see the short cut:
0.324 grams in 1 litter = 0.324 ppt (because 1 gram in 1 litter = 1 ppt)
EXAMPLE: Converting ounces to ppm and ppt:
5 ounces x 28.35 grams/ounce = 141.75 grams
141.75 grams x 1000 mg/g = 141,750 mg
141,750 mg ÷ 1 litter = 141,750 ppm
(if in 2 litters . . . 141,750 ÷ 2 litters = 70,875 ppm)
(if in 0.5 litters . . . 141,750 ÷ 0.5 litters = 283,500 ppm)
141,750 ppm ÷ 1000 ppm/ppt = 141.75 ppt
*Information Provided Courtesy of Eutech Instruments Pte Ltd Copyright © 1997