Henries to Attohenries Converter (H to aH)

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Live Conversion • ISO 80000-6:2022 Certified

1 Henry = 1 × 10¹⁸ Attohenry

1 H = 1 × 10¹⁸ aH • 1 aH = 1 × 10⁻¹⁸ H

Decimals:

Certified Authority Value

999999999999999872.00000000

From / Input

Swap to Attohenry to Henry

To / Result

Quick Values:

Conversion Formula

To convert Henry to Attohenry, multiply by 1 × 10¹⁸

H × 1 × 10¹⁸ = aH

Calculation: 1 H × 1 × 10¹⁸ = 1 × 10¹⁸ aH

Common Henry to Attohenry Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Henry (H) and Attohenry (aH).

Tap any row to calculate

Henry to Attohenry: Primary Direct Table (15 Steps)

Rule: 1 Henry is equal to 1 × 10¹⁸ aH (Attohenry)

Henry to Attohenry Conversion Reference Table
Conversion & Equivalent Value	Scientific Notation
0.001 H 1 × 10¹⁵ aH	1 × 10¹⁵
0.01 H 1 × 10¹⁶ aH	1 × 10¹⁶
0.1 H 1 × 10¹⁷ aH	1 × 10¹⁷
0.5 H 5 × 10¹⁷ aH	5 × 10¹⁷
1 H 1 × 10¹⁸ aH	1 × 10¹⁸
2 H 2 × 10¹⁸ aH	2 × 10¹⁸
5 H 5 × 10¹⁸ aH	5 × 10¹⁸
10 H 1 × 10¹⁹ aH	1 × 10¹⁹
20 H 2 × 10¹⁹ aH	2 × 10¹⁹
25 H 2.5 × 10¹⁹ aH	2.5 × 10¹⁹
50 H 5 × 10¹⁹ aH	5 × 10¹⁹
100 H 1 × 10²⁰ aH	1 × 10²⁰
250 H 2.5 × 10²⁰ aH	2.5 × 10²⁰
500 H 5 × 10²⁰ aH	5 × 10²⁰
1000 H 1 × 10²¹ aH	1 × 10²¹

Attohenry to Henry: Reciprocal Summary

Rule: 1 Attohenry is equal to 1 × 10⁻¹⁸ H (Henry)

Attohenry to Henry Conversion Reference Table
Reciprocal & Equivalent Value	Scientific Notation
1 aH 1 × 10⁻¹⁸ H	1 × 10⁻¹⁸
5 aH 5 × 10⁻¹⁸ H	5 × 10⁻¹⁸
10 aH 1 × 10⁻¹⁷ H	1 × 10⁻¹⁷
50 aH 5 × 10⁻¹⁷ H	5 × 10⁻¹⁷
100 aH 1 × 10⁻¹⁶ H	1 × 10⁻¹⁶

View Complete 15-Row Attohenry to Henry 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 Henry (H) and Attohenry (aH):

Henry References:

Heavy industrial AC motor field winding filter inductor coil 1 H

Attohenry References:

Heavy industrial AC motor field winding filter inductor coil 1.0E+18 aH

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

ISQ Dimension: [M L² T⁻² I⁻²] Coherent SI Unit: henry (H) Electromagnetism, Circuits & Field Theory

How to Convert Henry to Attohenry

Converting Henry (H) to Attohenry (aH) is a core calculation in Inductance, which measures the tendency of an electrical conductor to oppose changes in current by inducing an electromotive force. Both units reside within the International System of Units (SI) and share an identical physical dimension vector ([M L² T⁻² I⁻²]), 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 Henry equals 1 × 10¹⁸ Attohenry.

Direct Factor1 H = 1 × 10¹⁸ aH

Inverse Ratio1 aH = 1 × 10⁻¹⁸ H

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 (henry (H)) 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 H = 1 henry (H)

2. Target SI Bridge (k_target):1 aH = 1 × 10⁻¹⁸ henry (H)

Step-by-step substitution for Henry → Attohenry:V(aH) = V(H) × ( 1 / 1 × 10⁻¹⁸ ) = V(H) × 1 × 10¹⁸

Mathematical FormulaValue in Attohenry = Value in Henry × 1 × 10¹⁸Direct computational formula applied for standard conversion.

Worked Example

Evaluating an input of 12 Henry (H) produces 1.2 × 10¹⁹ Attohenry (aH). In heavy-duty utility and industrial workloads, 240 H equals 2.4 × 10²⁰ aH.

Inverse check: 1 aH = 1 × 10⁻¹⁸ H.

Understanding Henry and Attohenry

Domain Metrology & Engineering Applications

Governing Law & Equation

Faraday's Law of Self-Induction (V = -L · dI/dt)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using precision RF impedance analyzers, multi-frequency digital LCR meters, and transformer turns-ratio meters.

Primary Industry Sectors

Applied across switch-mode power supply (SMPS) design, electric vehicle motor stator winding, wireless charging resonant tank design, and power grid reactors under international metrology standard ISO 80000-6:2022.

Physical Orders of Magnitude & Laboratory Reference Benchmarks

Physical Phenomenon / Engineering Reference	Reference Value	Converted to Attohenry
Heavy industrial AC motor field winding filter inductor coil	`1 H`	`1 × 10¹⁸ aH`

Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-6:2022 and the BIPM SI Brochure (9th Edition). Governed by Faraday's Law of Self-Induction (V = -L · dI/dt) under ISO 80000 dimensional vector [M L² T⁻² I⁻²].

Multi-Variable Engineering Bridge Electromagnetic Induction & Flux Linkage

Inductance to Magnetic Flux Linkage Bridge (Webers • Milliwebers • Microwebers • Maxwells • Volt-Seconds)

Calculate total magnetic flux linkage λ = L × I across operating currents, bridging inductance [M L² T⁻² I⁻²] and magnetic flux [M L² T⁻² I⁻¹] via excitation current (I).

Input Self Inductance (L): H

Select Conducted Current: 3 A

Governing Law: λ = L × I

Vector: [H] × [A] → [Wb]

Live Calculated Bridge Equivalent:

1 H at SMPS Buck Inductor (3 A) = 3 Wb

Equals 3000 mWb • 3000000 μWb • 3 × 10⁸ Mx

SI Magnetic Flux

Webers

Transformer Scale

3000

mWb

Milliwebers

Sensor Scale

3000000

μWb

Microwebers

CGS Unit

3 × 10⁸

Maxwells

Inductive Standard

V·s

Volt-Seconds

Electrical Eng

300000

kline

Kilolines

Step-by-Step Numerical Derivation Proof View Derivation

1. Normalize Input to SI Base Unit (H):
L = 1 H × 1 = 1 H
2. Apply Engineering Parameter (I):
Selected condition: SMPS Buck Inductor (3 A) at I = 3 A
3. Execute Governing Physical Law in SI Units:
λ = L × I = (1 H) × (3 A) = 3 Wb
4. Convert to Standard Engineering Units:
• Wb: 3 × 1 = 3 Wb (Webers) • mWb: 3 × 1000 = 3000 mWb (Milliwebers) • μWb: 3 × 1000000 = 3000000 μWb (Microwebers) • Mx: 3 × 1 × 10⁸ = 3 × 10⁸ Mx (Maxwells) • V·s: 3 × 1 = 3 V·s (Volt-Seconds) • kline: 3 × 100000 = 300000 kline (Kilolines)

Explore Magnetic Flux Converter →

Engineering Substance / Operating Standard	Parameter Value (A)	Reference State / Condition	Typical Industrial & Engineering Application
Signal Filter Current (10 mA)	`0.01`	0.01 A (10 mA)	RF / audio choke operating current
SMPS Buck Inductor (3 A)	`3`	3.0 A peak	Point-of-load DC-DC converter peak current
EV Traction Inverter Phase (200 A)	`200`	200 A peak	Permanent magnet synchronous motor stator drive
Grid Current-Limiting Reactor (1,000 A)	`1000`	1,000 A rms	Substation fault current limiting reactor

Frequently Asked Questions

There are exactly 1 × 10¹⁸ attohenries (aH) in 1 henry (H). To calculate larger amounts manually, simply multiply your total number of henries by the conversion multiplier of 1 × 10¹⁸.

The mathematical formula to convert henries to attohenries is: [value] * 1 × 10¹⁸ = attohenries. 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 attohenries back to henries, you must divide your starting value by 1 × 10¹⁸. Our bidirectional tool automatically computes this inverse equation the moment you type into the attohenry input field.

1 Henry is larger than 1 Attohenry. Specifically, 1 Henry equals exactly 1 × 10¹⁸ attohenries, making it 1 × 10¹⁸ times larger (a difference of 18.00 orders of magnitude). Therefore, quantities expressed in attohenries require a larger numerical value to represent the same physical amount.

A typical heavy industrial AC motor field winding filter inductor coil measures 1 H, which corresponds to 1 × 10¹⁸ Attohenry (Attohenry).