Parts-per Unit Conversion
Enter the Parts-per value in the unit field, and the list below will immediately show the conversion results.
Parts per million (ppm)
Parts per million (ppm) Convert Result
Parts per million (ppm) MultipleChart
Logarithmic Scale
Parts-per Units Conversion Chart
Parts-per Units Introduction
Parts per million (ppm) represents the quantity of a specific component per million units. Specifically, 1 part per million equals 1 unit of a substance in 1 million units of a solution or mixture. For example, a concentration of a certain pollutant in water is 5 ppm, meaning there are 5 units of the pollutant per million water molecules.
Parts per billion (ppb) represents the quantity of a specific component per billion units. Specifically, 1 part per billion equals 1 unit of a substance in 1 billion units of a solution or mixture. For example, a concentration of a certain gas in the air is 20 ppb, meaning there are 20 units of the gas per billion air molecules.
Parts per trillion (ppt) represents the quantity of a specific component per trillion units. Specifically, 1 part per trillion equals 1 unit of a substance in 1 trillion units of a solution or mixture. For example, a concentration of a certain trace element in seawater is 3 ppt, meaning there are 3 units of the trace element per trillion seawater molecules.
Parts per quadrillion (ppq) represents the quantity of a specific component per quadrillion units. Specifically, 1 part per quadrillion equals 1 unit of a substance in 1 quadrillion units of a solution or mixture. For example, a concentration of a certain chemical in the air is 1 ppq, meaning there is 1 unit of the chemical per quadrillion air molecules.