Scientific Mass, Weight & Atomic Units Converter
Convert between fundamental atomic mass units (amu / Dalton), micrograms, milligrams, grams, kilograms, metric tons, grains, ounces, troy ounces, pounds, carats, and engineering slugs.
12 Scientific Units Available
| Unit Name | Symbol | Category | Converted Value | Copy |
|---|---|---|---|---|
| Kilogram | kg | SI Base | 100 | |
| Gram | g | SI Metric | 100,000 | |
| Milligram | mg | SI Metric | 100,000,000 | |
| Microgram | μg | Micro/Nano | 1.000000e+11 | |
| Metric Ton (Tonne) | t | SI Metric | 0.1 | |
| Dalton / Unified amu | Da / u | Atomic | 6.022141e+28 | |
| Pound (Avoirdupois) | lb | Imperial | 220.462262 | |
| Ounce (Avoirdupois) | oz | Imperial | 3,527.396195 | |
| Slug (Engineering) | slug | Imperial | 6.852177 | |
| Troy Ounce (Precious Metals) | oz t | Precious | 3,215.074657 | |
| Carat (Gemstones) | ct | Precious | 500,000 | |
| Grain | gr | Traditional | 1,543,235.835294 |
What is Scientific Mass & Atomic Mass Conversion?
Mass is an intrinsic property of physical matter measuring its resistance to acceleration (inertia). The SI base unit is the kilogram (kg), defined via the Planck constant h = 6.62607015×10⁻³⁴ J·s.
In atomic and molecular sciences, masses are quantified using the unified atomic mass unit (u or Da), defined as 1/12th of the rest mass of an unbound neutral carbon-12 atom (≈ 1.660539×10⁻²⁷ kg).
Formula & Step-by-Step Calculation
Where factors f relate each unit to the SI kilogram standard.
Worked Step-by-Step Examples
Convert 18.015 Da (molecular mass of water H2O) to grams and kilograms.
Common Real-World & Academic Use Cases
- ✓ Biochemistry mass spectrometry and protein molecular weight analysis in Daltons
- ✓ Pharmaceutical microgram dosage formulation and laboratory analytical balances
- ✓ Aerospace and mechanical engineering slug-to-pound mass inertial calculations
- ✓ Precious metals and gemstone appraisal in troy ounces and carats
How to Use the Scientific Mass, Weight & Atomic Units Converter
Enter Mass
Type any mass value into the string-buffered input field.
Select Reference Unit
Select the input unit from atomic Daltons to industrial metric tons.
Read Multi-Scale Results
View the complete multi-unit conversion matrix with scientific notation.
Frequently Asked Questions
Q: What is a slug in engineering?
A slug is the US customary unit of mass that accelerates at 1 ft/s² when exerted upon by a force of one pound-force (1 slug ≈ 14.5939 kg or 32.174 lb mass).
Q: How does a troy ounce differ from an avoirdupois ounce?
A troy ounce (used for gold and silver) is 31.1035 grams, whereas a standard avoirdupois ounce is 28.3495 grams.