Mass Percent Calculator
Calculate mass percent with explicit inputs and a worked example.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Educational calculation using the stated ideal model. Inputs must describe the same system; not a dosing or laboratory procedure.
Example Calculation
- Solute mass: 5 g
- Solvent mass: 95 g
5 g solute mixed with 95 g solvent gives 5% by mass.
Frequently asked questions
How do I use this calculator?
Enter solute mass, solvent mass. The result updates automatically. Use Reset to restore the example values.
What method does it use?
mass percent = solute / (solute + solvent) × 100. Educational calculation using the stated ideal model. Inputs must describe the same system; not a dosing or laboratory procedure.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.