Chemical Unit Converter Chemistry tools
English
English 日本語 ລາວ Монгол Oʻzbekcha Тоҷикӣ Кыргызча Қазақша Azərbaycan Հայերեն ქართული العربية Български বাংলা čeština Dansk Deutsch Ελληνικά Español Eesti Suomi Français हिन्दी ગુજરાતી ಕನ್ನಡ मराठी മലയാളം Srpski Slovenčina Slovenščina Kiswahili Hrvatski Magyar Indonesia Italiano 한국어 Lietuvių Latviešu Nederlands Norsk Svenska Polski Português Română Русский Українська Беларуская Shqip اردو தமிழ் తెలుగు Türkçe ภาษาไทย Tiếng Việt 简体中文 繁體中文 עברית ខ្មែរ Melayu မြန်မာ ਪੰਜਾਬੀ සිංහල Tagalog नेपाली فارسی

Chemical Unit Conversion Hub

Convert pressure, temperature, concentration, viscosity, and volume on one screen.

Approximate/precise modes, formulas, copy actions, history, and shareable URLs help you keep the assumptions visible when the conversion depends on conditions.

Immediate conversion after category and unit selection ppm(w/w)=mg/kg is shown explicitly Approximate/precise modes with formula display Copy, history, and share URLs for repeat work
ppm to mg/L (approx.) bar to psi cP to mPa·s °C to K

Check these assumptions first

This page supports unit conversion only. For chemical handling, equipment settings, formulation, and regulatory decisions, follow your procedures and SDS first.
ppm can mean different things in different fields. This tool treats ppm as ppm(w/w)=mg/kg by mass by default.
ppm↔mg/L and cross-family viscosity conversion depend on density and conditions. Confirm the assumption badges before using the result.

How to use

  1. Choose a category, then enter a value and units.
  2. For condition-dependent conversions, choose approximate or precise mode.
  3. If needed, enter density or change the display settings, then copy or share the result.

Examples

Concentration: ppm(w/w) to mg/L

Input

250 ppm(w/w), precise mode, ρ=1.02 kg/L

Output

255 mg/L

Pressure: bar to psi

Input

1 bar

Output

14.5038 psi

Viscosity: cP to mPa·s

Input

10 cP

Output

10 mPa·s

Glossary

ppm(w/w)

Mass-based parts per million. In this tool it defaults to mg/kg.

cP

Centipoise, a dynamic viscosity unit. 1 cP = 1 mPa·s.

cSt

Centistokes, a kinematic viscosity unit. 1 cSt = 1 mm²/s.

Representative formulas

  • psi = bar × 14.5037738
  • K = °C + 273.15
  • mg/L = ppm × ρ(kg/L)
  • ν = μ / ρ
  • 1 cP = 1 mPa·s

FAQ

Does ppm↔mg/L require density?

Yes. If ppm is treated as ppm(w/w)=mg/kg by mass, converting it to mg/L requires density. Approximate mode uses ρ=1.000 kg/L, while precise mode uses the density you enter.

Does it support US units?

Yes. You can use psi for pressure, °F for temperature, and US gal for volume. US gal and Imperial gal are shown as separate units.

Can I save history?

Yes. History can be stored in this browser, and you can turn history saving off in settings.

Are cP and mPa·s the same?

Yes. For dynamic viscosity, 1 cP = 1 mPa·s.

Notes

  • Approximate mode uses representative values for quick estimation.
  • Precise mode uses the conditions you enter, such as density.
  • If temperature or composition changes, density can change too, which changes ppm↔mg/L and cross-family viscosity results.
  • This tool treats ppm as ppm(w/w)=mg/kg by mass by default.