Conversion Factors

• 1 weight fraction = 100 weight %
• 1 weight % = 10 000 ppm (wt)
• 1 ppm (wt) = 1 000 ppb (wt)
• 1 ppm (wt) = 1 mg/kg
• 1 ppm (wt) = 1 000 µg/kg
• 1 ppm (wt) = 1 µg/g
• 1 ppm (wt) = 0.001 mg/g

Before You Go

Use this weight concentration converter to quickly cross-check reported concentrations when methods, specifications, or standards use different wt-based units. This helps avoid reporting errors, especially when comparing lab results, certificates of analysis, or regulatory limits.

Explore other Free GC Calculators to simplify daily analytical calculations and unit conversions.