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Converting Measurements Made Easy
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Back to Tips & Techniques
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Grains, grams, ounces, parts per million and parts per thousand
getting from here to there
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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 = 0.06489 (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 liters = ppm
- Convert ppm to ppt: divide ppm by 1000 ppm/ppt = ppt
Now back the other way.
- Convert ppt to ppm: multiply ppt by 1000 ppm/ppt = ppm
- Convert ppm to mg: multiply ppm by liters = 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
From the top, an example of 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 liter = 324 ppm
- (if in 2 liters . . . 324 mg . 2 liters = 162 ppm)
- (if in 0.5 liters . . . 324 mg . 0.5 liters = 648 ppm)
- 324 ppm . 1000 ppm/ppt = 0.324 ppt
You may already see the short cut
- 0.324 grams in 1 liter = 0.324 ppt (because 1 gram in 1 liter = 1 ppt)
For ounces, here is how to convert 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 liters = 141,750 ppm
- (if in 2 liters . . . 141,750 . 2 liters = 70,875 ppm)
- (if in 0.5 liters . . . 141,750 . 0.5 liters = 283,500 ppm)
- 141,750 ppm . 1000 ppm/ppt = 141.75 ppt
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