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Parts Per Converter

Convert between ppm, ppb, ppt, pph, percentage, per mille, and decimal fractions instantly.

About Parts Per Converter

Our Parts Per Converter is a comprehensive tool designed to convert between various parts-per notation units used in science, engineering, and industry. Parts-per notation expresses small fractions of quantities, commonly used in chemistry, physics, environmental monitoring, and quality control.

The tool supports conversions between Parts Per Hundred (%), Parts Per Thousand (ppt or per mille), Parts Per Million (ppm), Parts Per Billion (ppb), Parts Per Trillion (ppt), Parts Per Quadrillion (ppq), Percentage (%), Per Mille (‰), Decimal Fraction, and Basis Points. All conversions are calculated with high precision and displayed instantly.

Convert From

Common Conversions

Quick links to frequently used parts per conversions. Click any link to see the instant result.

1% to ppm
1 percent → ppm
1 ppm to %
1 ppm → percentage
1 ppm to ppb
1 ppm → ppb
1 ppb to ppm
1 ppb → ppm
100 ppm to %
100 ppm → percentage
500 ppm to %
500 ppm → percentage
1000 ppm to %
1000 ppm → percentage
0.5% to ppm
0.5 percent → ppm
2.5% to ppm
2.5 percent → ppm
10% to ppm
10 percent → ppm
1 ppm to ppt
1 ppm → ppt
1 ppt to ppm
1 ppt → ppm
1000 ppb to ppm
1000 ppb → ppm
50 ppm to ppb
50 ppm → ppb
1% to per mille
1 percent → per mille
1 per mille to %
1 per mille → percentage
100 ppm to ppb
100 ppm → ppb
500 ppb to ppm
500 ppb → ppm
1 ppm to decimal
1 ppm → decimal fraction
100 bp to %
100 basis points → percentage

Frequently Asked Questions

What is parts per notation?

Parts-per notation is a way of expressing very small fractions of quantities. It describes the number of parts of a substance per a certain number of parts of the whole. Common units include ppm (parts per million = 10⁻⁶), ppb (parts per billion = 10⁻⁹), and ppt (parts per trillion = 10⁻¹²).

How do I convert ppm to percentage?

To convert ppm to percentage, divide the ppm value by 10,000. For example, 500 ppm = 500 / 10,000 = 0.05%. Conversely, to convert percentage to ppm, multiply by 10,000. Our converter handles these calculations automatically.

What is the difference between ppb and ppt?

ppb stands for parts per billion (10⁻⁹ or 1/1,000,000,000), while ppt stands for parts per trillion (10⁻¹² or 1/1,000,000,000,000). One ppb equals 1,000 ppt. These units are commonly used in environmental science to measure trace contaminants in air or water.

What are basis points?

Basis points (bp) are used primarily in finance to describe small percentage changes. One basis point equals 0.01% or 0.0001 in decimal form, which is equivalent to 100 ppm. For example, an interest rate increase of 50 basis points means a 0.5% increase.

Where are parts per units commonly used?

Parts per units are widely used in chemistry (solution concentrations), environmental science (pollutant levels), manufacturing (quality control), pharmacology (drug concentrations), food safety (additive levels), and finance (basis points for interest rates). They provide a standardized way to express very dilute concentrations.

Is this converter free to use?

Yes! Our Parts Per Converter is completely free with no registration required. It provides instant, high-precision conversions for students, scientists, engineers, and anyone who needs to work with parts per notation.