Free Mass Converter
Mass is the scientist’s version of weight — and it spans from micrograms in a lab to slugs in engineering dynamics. This free mass converter handles the full scientific range, including atomic mass units for chemistry and slugs for physics, with exact conversion factors throughout.
Value in all mass units
| Unit | Value |
|---|
How to Use the Mass Converter
- Enter a value in the input box above.
- Choose the units to convert from and to — use the ⇄ button to swap them instantly.
- See the result immediately, plus the value converted into every other mass unit in the table below.
- Copy the result with one click to use it anywhere.
Features
Nine mass units from the atomic scale (u) to the industrial (metric tonnes), plus the engineering slug. Live results, direction swapping, and a complete table make comparing magnitudes effortless.
Benefits & Use Cases
Chemistry and physics students, lab technicians, and engineers converting between SI and imperial systems get precise, trustworthy values. High-precision constants are used throughout, so even tiny atomic-scale conversions stay accurate.
Tips
One atomic mass unit is 1.66053906660 × 10⁻²⁷ kg — the tool handles the extreme exponents for you. A slug is about 14.59 kg: it is the mass that accelerates at 1 ft/s² under one pound of force.
Frequently Asked Questions
What is the difference between mass and weight?
Mass is the amount of matter (kg, lb), while weight is the gravitational force on it. On Earth they scale together, which is why everyday converters treat them interchangeably.
What is a slug?
The imperial unit of mass: about 14.59 kg. One slug accelerates at 1 ft/s² when pushed with one pound-force.
How small is an atomic mass unit?
1 u = 1.66053906660 × 10⁻²⁷ kg — roughly the mass of a single proton or neutron.
How many grams are in an ounce?
28.349523125 grams per avoirdupois ounce.
Related Tools
Weight Converter
Convert kilograms to pounds, ounces to grams, stones to kg and more with NToolHub’s free weight converter. Fast, accurate, no sign-up needed.
Open tool →Density Converter
Convert g/cm³ to kg/m³, lb/ft³ to kg/m³, oz/gal and more with NToolHub’s free density converter. Precise constants, instant results, no sign-up.
Open tool →Force Converter
Convert newtons to pound-force, kilogram-force to newtons, dynes and more with NToolHub’s free force converter. Exact constants, instant results, no sign-up.
Open tool →Volume Converter
Convert liters to gallons, milliliters to cups, fluid ounces to liters with NToolHub’s free volume converter. US and imperial units, no sign-up.
Open tool →Energy Converter
Convert kWh to joules, calories to joules, BTU to kWh and more with NToolHub’s free energy converter. Instant results, no sign-up needed.
Open tool →