Concentration Calculator
Concentration is solute divided by the whole solution. Dissolving 30 g of salt in 200 g of water gives 230 g of solution, so 13%.
Your numbers
Concentration
15%
Solvent (g)
170g
Formula
Concentration = Solute (g) ÷ Solution (g) × 100
Divide by the solution (water plus solute), not by the water alone — dividing by 200 gives 15%, which is wrong.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Solute (g) (g)The stuff being dissolved — sugar, salt and the like. | 30 | 0 and up |
| Solution (g) (g)Solute and solvent together. | 200 | 0.01 and up |
Step by step
Quick reference table
Results when only Solute (g) (g) changes and everything else stays put.
| Solute (g) (g) | Concentration (%) | Solvent (g) (g) |
|---|---|---|
| 15 | 7.5 | 185 |
| 22.5 | 11.25 | 177.5 |
| 30 | 15 | 170 |
| 45 | 22.5 | 155 |
| 60 | 30 | 140 |
What each result means
| Result | At default values |
|---|---|
| Concentration (%)How much of the whole is solute. | 15 |
| Solvent (g) (g)What does the dissolving — usually water. | 170 |
Common mistakes
Divide by the solution (water plus solute), not by the water alone — dividing by 200 gives 15%, which is wrong.
Glossary
- Solute (g)
- The stuff being dissolved — sugar, salt and the like.
- Solution (g)
- Solute and solvent together.
- Concentration
- How much of the whole is solute.
- Solvent (g)
- What does the dissolving — usually water.
Frequently asked questions
Q. How is Concentration Calculator calculated?
Concentration = Solute (g) ÷ Solution (g) × 100 — Concentration is solute divided by the whole solution. Dissolving 30 g of salt in 200 g of water gives 230 g of solution, so 13%.
Q. Can you walk through an example?
With Solute (g) 30g, Solution (g) 200g, the answer is Concentration 15%.
Q. What do I need to enter?
Enter Solute (g), Solution (g). The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Solute (g) (g) moves the answer to Solute (g) (g) 15 → Concentration (%) 7.5 and Solute (g) (g) 60 → Concentration (%) 30. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Divide by the solution (water plus solute), not by the water alone — dividing by 200 gives 15%, which is wrong.
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