Attowatts to Watts Converter (aW to W)

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Live Conversion • ISO 80000-4:2019 Certified

1 Attowatt = 1 × 10⁻¹⁸ Watt

1 aW = 1 × 10⁻¹⁸ W • 1 W = 1 × 10¹⁸ aW

Decimals:

Certified Authority Value

0.00000000

From / Input

Swap to Watt to Attowatt

To / Result

Quick Values:

Conversion Formula

To convert Attowatt to Watt, multiply by 1 × 10⁻¹⁸

aW × 1 × 10⁻¹⁸ = W

Calculation: 1 aW × 1 × 10⁻¹⁸ = 1 × 10⁻¹⁸ W

Common Attowatt to Watt Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Attowatt (aW) and Watt (W).

Tap any row to calculate

Attowatt to Watt: Primary Direct Table (15 Steps)

Rule: 1 Attowatt is equal to 1 × 10⁻¹⁸ W (Watt)

Attowatt to Watt Conversion Reference Table
Conversion & Equivalent Value	Scientific Notation
0.001 aW 1 × 10⁻²¹ W	1 × 10⁻²¹
0.01 aW 1 × 10⁻²⁰ W	1 × 10⁻²⁰
0.1 aW 1 × 10⁻¹⁹ W	1 × 10⁻¹⁹
0.5 aW 5 × 10⁻¹⁹ W	5 × 10⁻¹⁹
1 aW 1 × 10⁻¹⁸ W	1 × 10⁻¹⁸
2 aW 2 × 10⁻¹⁸ W	2 × 10⁻¹⁸
5 aW 5 × 10⁻¹⁸ W	5 × 10⁻¹⁸
10 aW 1 × 10⁻¹⁷ W	1 × 10⁻¹⁷
20 aW 2 × 10⁻¹⁷ W	2 × 10⁻¹⁷
25 aW 2.5 × 10⁻¹⁷ W	2.5 × 10⁻¹⁷
50 aW 5 × 10⁻¹⁷ W	5 × 10⁻¹⁷
100 aW 1 × 10⁻¹⁶ W	1 × 10⁻¹⁶
250 aW 2.5 × 10⁻¹⁶ W	2.5 × 10⁻¹⁶
500 aW 5 × 10⁻¹⁶ W	5 × 10⁻¹⁶
1000 aW 1 × 10⁻¹⁵ W	1 × 10⁻¹⁵

Watt to Attowatt: Reciprocal Summary

Rule: 1 Watt is equal to 1 × 10¹⁸ aW (Attowatt)

Watt to Attowatt Conversion Reference Table
Reciprocal & Equivalent Value	Scientific Notation
1 W 1 × 10¹⁸ aW	1 × 10¹⁸
5 W 5 × 10¹⁸ aW	5 × 10¹⁸
10 W 1 × 10¹⁹ aW	1 × 10¹⁹
50 W 5 × 10¹⁹ aW	5 × 10¹⁹
100 W 1 × 10²⁰ aW	1 × 10²⁰

View Complete 15-Row Watt to Attowatt 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 Attowatt (aW) and Watt (W):

Attowatt References:

Single microscopic quantum nanomechanical cantilever thermal Brownian dissipation 1 aW

Watt References:

Small decorative holiday LED string light bulb power draw 1 W
Fast-charging smartphone USB-C wall power adapter output 20 W
Average adult human resting metabolic heat dissipation output 100 W
High-performance desktop gaming computer power supply rating 750 W

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

ISQ Dimension: [M L² T⁻³] Coherent SI Unit: watt (W) Chemical Engineering, Solutions & Physical Chemistry

How to Convert Attowatt to Watt

Converting Attowatt (aW) to Watt (W) is a core calculation in Power, which measures the rate of energy expenditure, conversion, or work transfer per unit of time. Both units reside within the International System of Units (SI) and share an identical physical dimension vector ([M L² T⁻³]), separated strictly by a decimal order-of-magnitude factor (10^-18). Because this shift involves integer powers of 10, the conversion is mathematically exact and free from decimal rounding or irrational fractional loss. Exactly 1 Attowatt equals 1 × 10⁻¹⁸ Watt.

Direct Factor1 aW = 1 × 10⁻¹⁸ W

Inverse Ratio1 W = 1 × 10¹⁸ aW

Conversion ScalePure SI Metric Prefix Shift (10ⁿ Decimal Scaling)

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 (watt (W)) without arbitrary rounding:

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 (k_source):1 aW = 1 × 10⁻¹⁸ watt (W)

2. Target SI Bridge (k_target):1 W = 1 watt (W)

Step-by-step substitution for Attowatt → Watt:V(W) = V(aW) × ( 1 × 10⁻¹⁸ / 1 ) = V(aW) × 1 × 10⁻¹⁸

Mathematical FormulaValue in Watt = Value in Attowatt × 1 × 10⁻¹⁸Direct computational formula applied for standard conversion.

Worked Example

To convert 50 Attowatt (aW) to Watt (W): multiply 50 by 1 × 10⁻¹⁸ to get 5 × 10⁻¹⁷ W. At an industrial engineering scale, 10000 aW converts to 1 × 10⁻¹⁴ W.

Inverse check: 1 W = 1 × 10¹⁸ aW.

Understanding Attowatt and Watt

Domain Metrology & Engineering Applications

Governing Law & Equation

Mechanical & Thermodynamic Energy Rate (P = dW/dt = F · v)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using precision digital power analyzers (Yokogawa-type), absorption water-brake dynamometers, and RF thermistor bolometer mounts.

Primary Industry Sectors

Applied across electric vehicle powertrain dyno testing, renewable solar inverter rating, industrial steam turbine generation, and data center power management under international metrology standard ISO 80000-4:2019, NIST SP 811.

Physical Orders of Magnitude & Laboratory Reference Benchmarks

Physical Phenomenon / Engineering Reference	Reference Value	Converted to Watt
Single microscopic quantum nanomechanical cantilever thermal Brownian dissipation	`1 aW`	`1 × 10⁻¹⁸ W`

Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-4:2019, NIST SP 811 and the BIPM SI Brochure (9th Edition). Governed by Mechanical & Thermodynamic Energy Rate (P = dW/dt = F · v) under ISO 80000 dimensional vector [M L² T⁻³].

Multi-Variable Engineering Bridge Continuous Power & Energy Storage

Continuous Power & Load Duration Bridge (Joules • kWh • Megajoules • Watt-Hours • BTU)

Calculate total energy consumption and utility billing E = P × t across equipment operating duty cycles, bridging power [M L² T⁻³] with energy [M L² T⁻²].

Input Equipment Power Rating (P): aW

Select Operating Timespan: 3600 s

Governing Law: E = P × t

Vector: [W] × [s] → [J]

Live Calculated Bridge Equivalent:

1 aW at 1 Hour Continuous Run (3,600 s) = 3.6 × 10⁻¹⁵ J

Equals 3.6 × 10⁻¹⁸ kJ • 3.6 × 10⁻²¹ MJ • 1 × 10⁻²¹ kWh

SI Energy

3.6 × 10⁻¹⁵

Joules

Thermal Scale

3.6 × 10⁻¹⁸

Kilojoules

Bulk Energy

3.6 × 10⁻²¹

Megajoules

Electric Utility Meter

1 × 10⁻²¹

kWh

Kilowatt-Hours

Battery Capacity

1 × 10⁻¹⁸

Watt-Hours

Imperial Thermal

3.4121 × 10⁻¹⁸

BTU

British Thermal Units

Step-by-Step Numerical Derivation Proof View Derivation

1. Normalize Input to SI Base Unit (W):
P = 1 aW × 1 × 10⁻¹⁸ = 1 × 10⁻¹⁸ W
2. Apply Engineering Parameter (t):
Selected condition: 1 Hour Continuous Run (3,600 s) at t = 3600 s
3. Execute Governing Physical Law in SI Units:
E = P × t = (1 × 10⁻¹⁸ W) × (3600 s) = 3.6 × 10⁻¹⁵ J
4. Convert to Standard Engineering Units:
• J: 3.6 × 10⁻¹⁵ × 1 = 3.6 × 10⁻¹⁵ J (Joules) • kJ: 3.6 × 10⁻¹⁵ × 0.001 = 3.6 × 10⁻¹⁸ kJ (Kilojoules) • MJ: 3.6 × 10⁻¹⁵ × 1 × 10⁻⁶ = 3.6 × 10⁻²¹ MJ (Megajoules) • kWh: 3.6 × 10⁻¹⁵ × 2.7778 × 10⁻⁷ = 1 × 10⁻²¹ kWh (Kilowatt-Hours) • Wh: 3.6 × 10⁻¹⁵ × 0.0002778 = 1 × 10⁻¹⁸ Wh (Watt-Hours) • BTU: 3.6 × 10⁻¹⁵ × 0.0009478 = 3.4121 × 10⁻¹⁸ BTU (British Thermal Units)

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Engineering Substance / Operating Standard	Parameter Value (s)	Reference State / Condition	Typical Industrial & Engineering Application
1 Hour Continuous Run (3,600 s)	`3600`	3,600 s (1 hour)	Standard 1-hour utility metering basis
8-Hour Commercial Work Shift (28,800 s)	`28800`	28,800 s (8 hours)	Single factory shift run time
24-Hour Continuous Operation (86,400 s)	`86400`	86,400 s (1 day)	24/7 server rack or process pump
30-Day Monthly Billing Cycle (2,592,000 s)	`2592000`	2,592,000 s (720 hours)	Monthly utility electric billing cycle
1 Full Year (8,760 hours / 31,536,000 s)	`3.1536 × 10⁷`	31,536,000 s (1 year)	Annual facility energy footprint

Frequently Asked Questions

There are exactly 1 × 10⁻¹⁸ watts (W) in 1 attowatt (aW). To calculate larger amounts manually, simply multiply your total number of attowatts by the conversion multiplier of 1 × 10⁻¹⁸.

The mathematical formula to convert attowatts to watts is: [value] * 1 × 10⁻¹⁸ = watts. 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 watts back to attowatts, you must divide your starting value by 1 × 10⁻¹⁸. Our bidirectional tool automatically computes this inverse equation the moment you type into the watt input field.

1 Watt is larger than 1 Attowatt. Specifically, 1 Attowatt equals 1 × 10⁻¹⁸ watts, meaning 1 Watt is 1 × 10¹⁸ times larger than 1 Attowatt (a difference of 18.00 orders of magnitude). Expressing measurements in attowatts requires a larger numerical value to represent the equivalent physical magnitude.

A typical single microscopic quantum nanomechanical cantilever thermal Brownian dissipation measures 1 aW, which corresponds to 1 × 10⁻¹⁸ W (Watt).