When you want to know how much of a substance is in water or any liquid, you might see measurements like grams per litre (g/L) or parts per million (PPM). Here’s a simple explanation to understand and convert between these two:
What is Grams per Litre (g/L)?
- It tells you how many grams of a substance are present in 1 litre of water.
- For example, if you have 2 g/L, it means 2 grams of the substance are dissolved in 1 litre of water.
What is Parts Per Million (PPM)?
- PPM means how many parts of a substance there are in one million parts of the total solution.
- It’s like saying, out of one million drops of water, how many drops are of the substance.
- Because 1 litre of water weighs approximately 1,000,000 grams, PPM is almost the same as milligrams per litre (mg/L).
How to Convert Grams per Litre (g/L) to PPM?
- Since 1 gram = 1000 milligrams,
- And 1 litre of water ≈ 1,000,000 milligrams,
- So,
Example:
If your solution has 0.5 g/L of fertilizer,
PPM=0.5×1000=500 PPMThis means there are 500 parts of fertilizer in every million parts of water.
Summary:
| Grams per Litre (g/L) | Parts Per Million (PPM) |
|---|---|
| 0.001 | 1 |
| 0.01 | 10 |
| 0.1 | 100 |
| 1 | 1000 |
This calculator helps farmers understand and measure the concentration of fertilizers, chemicals, or nutrients in water easily for better crop management.
You can find more agriculture conversion calculators here.