PPM calculator

Find parts per million by mass: ppm = solute mass ÷ total mixture mass × 1,000,000.

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Solute mass

Total mixture mass

Answer

…

Find parts per million by mass: ppm = solute mass ÷ total mixture mass × 1,000,000.

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Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

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Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Both masses use the same unit. Total mixture includes the solute. This is mass/mass ppm, not volume ppm or an automatic mg/L conversion.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using PPM calculator

Find parts per million by mass: ppm = solute mass ÷ total mixture mass × 1,000,000.

Both masses use the same unit. Total mixture includes the solute. This is mass/mass ppm, not volume ppm or an automatic mg/L conversion.

Next: Dilution calculator

A worked example

Example inputs: solute mass = 0.002, total mixture mass = 2. Mass fraction (ppm) = 1000.

Before you use the result

Both masses use the same unit. Total mixture includes the solute. This is mass/mass ppm, not volume ppm or an automatic mg/L conversion.

Example results for solute mass

These examples use Total mixture mass: 2. They are reference calculations, not recommended settings.

Solute mass	Mass fraction (ppm)
0.001	500
0.002	1000
0.004	2000

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