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Percent Composition Calculator.

Calculate component mass percentage from component and total mass.

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Component mass

Total mass

Composition

25.0000%

Educational arithmetic only. Keep units consistent and use measured or explicitly supplied chemistry inputs; this tool does not infer reaction pathways, property tables, or safety guidance.

Use Cases

Verify chemical formulas

Check the mass percentage of an element in a compound to confirm the formula or purity of a sample.

Example: For CO2, carbon mass is 12.01 g, total mass is 44.01 g, so carbon is 27.29%.

Prepare solutions or alloys

Determine the percentage of a solute in a solution or a component in an alloy to achieve desired properties.

Example: To make a 10% salt solution, use 10 g salt and 90 g water.

Frequently Asked Questions

How do I calculate percent composition?: Divide the component mass by the total mass, then multiply by 100. For example, if a mixture has 5 g of salt and 95 g of water, the salt's percent composition is (5/100)*100 = 5%.
What units should I use for component and total mass?: Use any consistent mass units, such as grams, kilograms, or pounds. The calculator will give the percentage regardless of the unit, as long as both inputs are in the same unit.
Can I use this calculator for chemical compounds?: Yes, you can use it to find the mass percentage of an element in a compound if you know the mass of that element and the total mass of the compound. For example, in water (H2O), the mass of hydrogen is 2.016 g and total mass is 18.016 g, giving 11.19% hydrogen.

Tips & Common Mistakes

Tips

Ensure both masses are in the same unit (e.g., grams) before calculating.
Double-check that the total mass is the sum of all components in the mixture.
Use the percentage to compare compositions across different samples.
For mixtures with more than two components, calculate each component's percentage separately.

Common Mistakes to Avoid

Using different units for component and total mass, leading to incorrect percentages.
Entering the total mass as the mass of the other component instead of the whole mixture.
Forgetting to multiply by 100, resulting in a decimal instead of a percentage.

Last updated: August 13, 2026

Use Cases

Verify chemical formulas

Check the mass percentage of an element in a compound to confirm the formula or purity of a sample.

Example: For CO2, carbon mass is 12.01 g, total mass is 44.01 g, so carbon is 27.29%.

Prepare solutions or alloys

Determine the percentage of a solute in a solution or a component in an alloy to achieve desired properties.

Example: To make a 10% salt solution, use 10 g salt and 90 g water.

Frequently Asked Questions

How do I calculate percent composition?

Divide the component mass by the total mass, then multiply by 100. For example, if a mixture has 5 g of salt and 95 g of water, the salt's percent composition is (5/100)*100 = 5%.

What units should I use for component and total mass?

Use any consistent mass units, such as grams, kilograms, or pounds. The calculator will give the percentage regardless of the unit, as long as both inputs are in the same unit.

Can I use this calculator for chemical compounds?

Yes, you can use it to find the mass percentage of an element in a compound if you know the mass of that element and the total mass of the compound. For example, in water (H2O), the mass of hydrogen is 2.016 g and total mass is 18.016 g, giving 11.19% hydrogen.

Tips & Common Mistakes

Tips

Ensure both masses are in the same unit (e.g., grams) before calculating.
Double-check that the total mass is the sum of all components in the mixture.
Use the percentage to compare compositions across different samples.
For mixtures with more than two components, calculate each component's percentage separately.

Common Mistakes to Avoid

Using different units for component and total mass, leading to incorrect percentages.
Entering the total mass as the mass of the other component instead of the whole mixture.
Forgetting to multiply by 100, resulting in a decimal instead of a percentage.

Use Cases

Verify chemical formulas

Check the mass percentage of an element in a compound to confirm the formula or purity of a sample.

Example: For CO2, carbon mass is 12.01 g, total mass is 44.01 g, so carbon is 27.29%.

Prepare solutions or alloys

Determine the percentage of a solute in a solution or a component in an alloy to achieve desired properties.

Example: To make a 10% salt solution, use 10 g salt and 90 g water.

Frequently Asked Questions

How do I calculate percent composition?

Divide the component mass by the total mass, then multiply by 100. For example, if a mixture has 5 g of salt and 95 g of water, the salt's percent composition is (5/100)*100 = 5%.

What units should I use for component and total mass?

Use any consistent mass units, such as grams, kilograms, or pounds. The calculator will give the percentage regardless of the unit, as long as both inputs are in the same unit.

Can I use this calculator for chemical compounds?

Tips & Common Mistakes

Tips

Ensure both masses are in the same unit (e.g., grams) before calculating.
Double-check that the total mass is the sum of all components in the mixture.
Use the percentage to compare compositions across different samples.
For mixtures with more than two components, calculate each component's percentage separately.

Common Mistakes to Avoid

Using different units for component and total mass, leading to incorrect percentages.
Entering the total mass as the mass of the other component instead of the whole mixture.
Forgetting to multiply by 100, resulting in a decimal instead of a percentage.