Percentage Change in Mass Calculator: \% change = mend - mstartmstart × 100

Percentage Change in Mass Calculator

💧 Diffusion, osmosis & transport. Use the Percentage change in mass formula to find change, mass at the end, mass at the start: pick the value you want, type the others, and the answer updates as you go.

\%\ \text{change} = \dfrac{m_{end} - m_{start}}{m_{start}} \times 100

Positive = gained water (the solution was more dilute). Negative = lost water.

Change (%)Mass at the end (g)Mass at the start (g)

Change-12.5 %

Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.

What each letter means

Quantity	Unit
Change	%
Mass at the end	g
Mass at the start	g

Worked example

Find the change when Mass at the end = 1.75 g, Mass at the start = 2 g.

Using \% change = mend - mstartmstart × 100: Change = -12.5 %.

Frequently asked questions

What is the formula for Percentage change in mass?

\% change = mend - mstartmstart × 100. Positive = gained water (the solution was more dilute). Negative = lost water.

What do the letters stand for, and what units are used?

Change in %, Mass at the end in g, Mass at the start in g.

How do you calculate change?

Put the values into \% change = mend - mstartmstart × 100. For example, with Mass at the end = 1.75 g, Mass at the start = 2 g, change = -12.5 %.

Can I solve for a different value?

Yes. In the calculator above, pick the circle next to any value (change, mass at the end, mass at the start) and fill in the others: it rearranges the formula for you.