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Atomic Mass Unit to Dalton (u to Da) Conversion Utility

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Live Conversion • BIPM SI Brochure (9th Edition) Certified
1 Atomic Mass Unit = 1 Dalton
1 u = 1 Da • 1 Da = 1 u
Atomic Mass Unit to Dalton: One Atomic Mass Unit is equal to 1 Dalton.
Certified Authority Value
1.00000000
Da
Exact: 1 Da ≡ 1 u
u
u
Swap to Dalton to Atomic Mass Unit
Da
Da 1
Quick Values:
1 u 5 u 10 u 25 u 50 u 100 u 250 u 500 u 1,000 u
Conversion Formula
To convert Atomic Mass Unit to Dalton, multiply by 1
u × 1 = Da

Calculation: 1 u × 1 = 1 Da

Common Atomic Mass Unit to Dalton Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Atomic Mass Unit (u) and Dalton (Da).

Tap any row to calculate
Atomic Mass Unit to Dalton: Primary Direct Table (15 Steps)
Atomic Mass Unit to Dalton Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 u is equal to 0.001 Da (Dalton) 1 × 10⁻³
0.01 u is equal to 0.01 Da (Dalton) 1 × 10⁻²
0.1 u is equal to 0.1 Da (Dalton) 1 × 10⁻¹
0.5 u is equal to 0.5 Da (Dalton) 5 × 10⁻¹
1 u is equal to 1 Da (Dalton) 1 × 10⁰
2 u is equal to 2 Da (Dalton) 2 × 10⁰
5 u is equal to 5 Da (Dalton) 5 × 10⁰
10 u is equal to 10 Da (Dalton) 1 × 10¹
20 u is equal to 20 Da (Dalton) 2 × 10¹
25 u is equal to 25 Da (Dalton) 2.5 × 10¹
50 u is equal to 50 Da (Dalton) 5 × 10¹
100 u is equal to 100 Da (Dalton) 1 × 10²
250 u is equal to 250 Da (Dalton) 2.5 × 10²
500 u is equal to 500 Da (Dalton) 5 × 10²
1000 u is equal to 1000 Da (Dalton) 1 × 10³
Dalton to Atomic Mass Unit: Reciprocal Summary
Dalton to Atomic Mass Unit Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Da is equal to 1 u (Atomic Mass Unit) 1 × 10⁰
5 Da is equal to 5 u (Atomic Mass Unit) 5 × 10⁰
10 Da is equal to 10 u (Atomic Mass Unit) 1 × 10¹
50 Da is equal to 50 u (Atomic Mass Unit) 5 × 10¹
100 Da is equal to 100 u (Atomic Mass Unit) 1 × 10²
View Complete 15-Row Dalton to Atomic Mass Unit Table

Real-World Context & Everyday Benchmarks

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To help contextualize these units in everyday life, science, and engineering, here are verified real-world reference points for Atomic Mass Unit (u) and Dalton (Da):

Atomic Mass Unit References:

  • One twelfth mass of single unbound neutral carbon-12 atom at rest 1 u
  • Single water molecule H2O molecular formula weight 18.015 u
  • Single glucose sugar molecule C6H12O6 molecular mass 180.16 u

Dalton References:

  • Carbon-12 atomic mass twelfth biochemical standard unit 1 Da
  • Human hemoglobin blood oxygen-transport protein molecular weight 64500 Da
  • Human titin giant muscular structural protein molecular weight 3800000 Da

Tap any benchmark above to automatically calculate its exact equivalent in Dalton.

ISQ Dimension: [M] Coherent SI Unit: kilogram (kg) Classical Mechanics & Dimensional Metrology

How to Convert Atomic Mass Unit to Dalton

Converting Atomic Mass Unit (u) to Dalton (Da) is a core calculation in Mass and Weight, which quantifies the fundamental amount of physical matter contained within an object and its resistance to acceleration (inertia). Both units share an identical 1:1 scale equivalence within this physical measurement domain. They represent the exact same physical magnitude under different metrological designations or derived SI formulations (1 u ≡ 1 Da). Any quantity expressed in Atomic Mass Unit translates directly to Dalton without mathematical scaling.

Direct Factor1 u = 1 Da
Inverse Ratio1 Da = 1 u
Conversion Scale1:1 Direct Dimensional Identity
First-Principles SI Derivation ProofNIST SP 811 / ISO 80000 Compliance

Mathematical Conversion Derivation via Coherent SI Base Unit

Under the International System of Quantities (ISQ), dimensional conversion between non-SI units is rigorously resolved by bridging through the coherent SI base unit (kilogram (kg)) without arbitrary rounding:

Vtarget=Vsource×(ksource→SIktarget→SI)V_{\text{target}} = V_{\text{source}} \times \left( \frac{k_{\text{source} \to \text{SI}}}{k_{\text{target} \to \text{SI}}} \right)
Universal Dimensional Conversion Law (ISO 80000 / NIST SP 811)
1. Source SI Bridge (ksource):1 u = 1.660539 × 10⁻²⁷ kilogram (kg)
2. Target SI Bridge (ktarget):1 Da = 1.660539 × 10⁻²⁷ kilogram (kg)
Step-by-step substitution for Atomic Mass Unit → Dalton:V(Da) = V(u) × ( 1.660539 × 10⁻²⁷ / 1.660539 × 10⁻²⁷ ) = V(u) × 1
Mathematical FormulaValue in Dalton = Value in Atomic Mass Unit × 1Direct computational formula applied for standard conversion.
Worked Example

To convert 120 Atomic Mass Unit (u) to Dalton (Da): multiply 120 by 1 to get 120 Da. At an industrial engineering scale, 100 u converts to 100 Da.

Inverse check: 1 Da = 1 u.

Understanding Atomic Mass Unit and Dalton

Atomic Mass Unit

u
Standard Unit

An Atomic Mass Unit (u) is a recognized unit for mass and weight.

Applications & Practical Context

In practical weight terms, a one twelfth mass of single unbound neutral carbon-12 atom at rest equals 1 u, a single water molecule H2O molecular formula weight equals 18.015 u, a single glucose sugar molecule C6H12O6 molecular mass equals 180.16 u.

Physical Setup

A mass of 1 u corresponds to 1.660539 × 10⁻²⁷ kilograms of physical matter under standard SI metrology.

Conversion to SI Unit: kilogram (kg)
1 u = 1.660539 × 10⁻²⁷ kg

Dalton

Da
Standard Unit

A Dalton (Da) is a recognized unit for mass and weight.

Applications & Practical Context

In practical weight terms, a carbon-12 atomic mass twelfth biochemical standard unit equals 1 Da, a human hemoglobin blood oxygen-transport protein molecular weight equals 64500 Da, a human titin giant muscular structural protein molecular weight equals 3800000 Da.

Physical Setup

A mass of 1 Da corresponds to 1.660539 × 10⁻²⁷ kilograms of physical matter under standard SI metrology.

Conversion to SI Unit: kilogram (kg)
1 Da = 1.660539 × 10⁻²⁷ kg

Domain Metrology & Engineering Applications

Governing Law & Equation

Planck Constant Definition (h ≡ 6.62607015 × 10⁻³⁴ J·s)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using analytical microbalances, strain-gauge load cells, mass comparators, and heavy-duty weighbridge systems.

Primary Industry Sectors

Applied across pharmaceutical formulation, commercial freight logistics, chemical compounding, and aerospace payload calibration under international metrology standard BIPM SI Brochure (9th Edition), CODATA 2022.

Physical Orders of Magnitude & Laboratory Reference Benchmarks

Physical Phenomenon / Engineering ReferenceReference ValueConverted to Dalton
One twelfth mass of single unbound neutral carbon-12 atom at rest1 u1 Da
Single water molecule H2O molecular formula weight18.015 u18.015 Da
Single glucose sugar molecule C6H12O6 molecular mass180.16 u180.16 Da
Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the BIPM SI Brochure (9th Edition), CODATA 2022. Governed by Planck Constant Definition (h ≡ 6.62607015 × 10⁻³⁴ J·s) under ISO 80000 dimensional vector [M].

Multi-Variable Engineering Bridge Material Science & Solid Displacement

Mass–Volume–Density Material Bridge (m³ • Liters • Gallons • Cu. Ft • Metric Tons • Pounds)

Calculate solid displacement, storage volume, and shipping mass using the fundamental mass-density relation m = ρ × V, bridging physical mass [M] and bulk volume [L³] via metrological solid density (ρ).

V = m / ρ
Live Calculated Bridge Equivalent:
1 u at Structural Carbon Steel (ASTM A36) = 2.1153 × 10⁻²⁸ L
Equals 2.115336 × 10⁻³¹ m³ • 5.5881 × 10⁻²⁹ gal (US) • 7.4702 × 10⁻³⁰ ft³
Fluid / Disp Volume
2.1153 × 10⁻²⁸
L
Liters
SI Standard
2.115336 × 10⁻³¹
m³
Cubic Meters
US Liquid Standard
5.5881 × 10⁻²⁹
gal (US)
US Gallons
Imperial Standard
7.4702 × 10⁻³⁰
ft³
Cubic Feet
Civil / Concrete
2.7668 × 10⁻³¹
yd³
Cubic Yards
UK Standard
4.6531 × 10⁻²⁹
gal (UK)
Imperial Gallons
  1. 1. Normalize Input to SI Base Unit (kg):
    m = 1 u × 1.66053907 × 10⁻²⁷ = 1.66053907 × 10⁻²⁷ kg
  2. 2. Apply Engineering Parameter (ρ):
    Selected condition: Structural Carbon Steel (ASTM A36) at ρ = 7850 kg/m³
  3. 3. Execute Governing Physical Law in SI Units:
    V = m / ρ = (1.66053907 × 10⁻²⁷) ÷ (7850) = 2.115336 × 10⁻³¹ m³
  4. 4. Convert to Standard Engineering Units:
    • L: 2.115336 × 10⁻³¹ × 1000 = 2.1153 × 10⁻²⁸ L (Liters) • m³: 2.115336 × 10⁻³¹ × 1 = 2.115336 × 10⁻³¹ m³ (Cubic Meters) • gal (US): 2.115336 × 10⁻³¹ × 264.1721 = 5.5881 × 10⁻²⁹ gal (US) (US Gallons) • ft³: 2.115336 × 10⁻³¹ × 35.3147 = 7.4702 × 10⁻³⁰ ft³ (Cubic Feet) • yd³: 2.115336 × 10⁻³¹ × 1.308 = 2.7668 × 10⁻³¹ yd³ (Cubic Yards) • gal (UK): 2.115336 × 10⁻³¹ × 219.9692 = 4.6531 × 10⁻²⁹ gal (UK) (Imperial Gallons)
Explore Full Density Converter →
Engineering Substance / Operating Standard Parameter Value (kg/m³) Reference State / Condition Typical Industrial & Engineering Application
Structural Carbon Steel (ASTM A36) 7850 20°C, standard mill carbon steel I-beams, rebar, plate & structural fabrication
Aluminum Alloy (6061-T6) 2700 20°C, wrought structural alloy Aerospace, automotive chassis & framing profiles
Pure Electrolytic Copper (ETP C11000) 8940 20°C, ASTM B187 Electrical busbars, wiring & heat exchanger tubing
Reinforced Concrete (Normal Weight) 2400 Cured, standard 28-day stone aggregate Civil engineering foundations, columns & slabs
Water (Pure Metrology Benchmark, 4°C) 1000 4°C, 1 atm (SG = 1.000) Hydraulic displacement calibration & SG standard
Structural Softwood (Dry Pine / Douglas Fir) 500 12% equilibrium moisture content Architectural timber framing & lumber freight
Structural Hardwood (White Oak) 750 Air-dried, 12% moisture Heavy timber construction, rail ties & flooring
Pure Gold Bullion (24K / 99.99%) 19320 20°C, cast bullion standard Precious metals custody & assay verification
Titanium Alloy (Grade 5 Ti-6Al-4V) 4430 Annealed, ASTM B265 Aerospace turbines, airframe forgings & implants
Gray Cast Iron (Class 30) 7200 20°C, ASTM A48 Engine cylinder blocks, pump housings & machine bases
Automotive Gasoline / Petrol (15°C) 740 15°C, ASTM D4814 Fuel tank volume sizing & bunkering logistics
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Frequently Asked Questions

The mathematical formula to convert atomic mass units to daltons is: [value] * 1 = daltons. Rather than doing the math manually, you can use our high-precision online calculator to process this exact equation instantly without rounding errors.

To perform the reverse calculation from daltons back to atomic mass units, you must divide your starting value by 1. Our bidirectional tool automatically computes this inverse equation the moment you type into the dalton input field.

1 Atomic Mass Unit and 1 Dalton represent the exact same physical magnitude with an identical 1:1 conversion ratio.

A typical one twelfth mass of single unbound neutral carbon-12 atom at rest measures 1 u, which corresponds to 1 Dalton (Dalton).

One atomic mass unit (u) equals exactly 1 Dalton (Da). Under ISO 80000-10 standards and IUPAC conventions, both units are defined as 1 / 12 of the mass of an unbound, neutral carbon-12 atom at rest in its ground state.

Because atomic mass units and Daltons are identical standard units of mass, the direct conversion is a 1:1 scaling:
V(Da) = V(u) × 1

To convert Daltons (V(Da)) back into unified atomic mass units (V(u)), multiply by 1:
V(u) = V(Da) × 1

Nuclear physics historically adopted the unified atomic mass unit (u), whereas biochemistry, proteomics, and mass spectrometry widely use the Dalton (Da) to describe macromolecular masses (e.g., kilodaltons, kDa). Both share identical numerical magnitude.

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