Poise to Pounds/second/square inch Converter (P to lbf·s/in²)

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Live Conversion • ISO 80000-4:2019 Certified

1 Poise = 1.450377 × 10⁻⁵ Pound-second/square inch

1 P = 1.450377 × 10⁻⁵ lbf·s/in² • 1 lbf·s/in² = 68947.590868 P

Decimals:

Certified Authority Value

0.00001450

lbf·s/in²

From / Input

Swap to Pound-second/square inch to Poise

To / Result

lbf·s/in²

Quick Values:

Conversion Formula

To convert Poise to Pound-second/square inch, multiply by 1.450377 × 10⁻⁵

P × 1.450377 × 10⁻⁵ = lbf·s/in²

Calculation: 1 P × 1.450377 × 10⁻⁵ = 1.450377 × 10⁻⁵ lbf·s/in²

Common Poise to Pound-second/square inch Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Poise (P) and Pound-second/square inch (lbf·s/in²).

Tap any row to calculate

Poise to Pound-second/square inch: Primary Direct Table (15 Steps)

Rule: 1 Poise is equal to 1.450377 × 10⁻⁵ lbf·s/in² (Pound-second/square inch)

Poise to Pound-second/square inch Conversion Reference Table
Conversion & Equivalent Value	Scientific Notation
0.001 P 1.450377 × 10⁻⁸ lbf·s/in²	1.45 × 10⁻⁸
0.01 P 1.450377 × 10⁻⁷ lbf·s/in²	1.45 × 10⁻⁷
0.1 P 1.450377 × 10⁻⁶ lbf·s/in²	1.45 × 10⁻⁶
0.5 P 7.251885 × 10⁻⁶ lbf·s/in²	7.252 × 10⁻⁶
1 P 1.450377 × 10⁻⁵ lbf·s/in²	1.45 × 10⁻⁵
2 P 2.900754 × 10⁻⁵ lbf·s/in²	2.901 × 10⁻⁵
5 P 7.251885 × 10⁻⁵ lbf·s/in²	7.252 × 10⁻⁵
10 P 0.000145038 lbf·s/in²	1.45 × 10⁻⁴
20 P 0.000290075 lbf·s/in²	2.901 × 10⁻⁴
25 P 0.000362594 lbf·s/in²	3.626 × 10⁻⁴
50 P 0.000725189 lbf·s/in²	7.252 × 10⁻⁴
100 P 0.00145038 lbf·s/in²	1.45 × 10⁻³
250 P 0.00362594 lbf·s/in²	3.626 × 10⁻³
500 P 0.00725189 lbf·s/in²	7.252 × 10⁻³
1000 P 0.0145038 lbf·s/in²	1.45 × 10⁻²

Pound-second/square inch to Poise: Reciprocal Summary

Rule: 1 Pound-second/square inch is equal to 68947.590868 P (Poise)

Pound-second/square inch to Poise Conversion Reference Table
Reciprocal & Equivalent Value	Scientific Notation
1 lbf·s/in² 68947.590868 P	6.895 × 10⁴
5 lbf·s/in² 344737.954339 P	3.447 × 10⁵
10 lbf·s/in² 689475.908678 P	6.895 × 10⁵
50 lbf·s/in² 3447379.543388 P	3.447 × 10⁶
100 lbf·s/in² 6894759.086775 P	6.895 × 10⁶

View Complete 15-Row Pound-second/square inch to Poise 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 Poise (P) and Pound-second/square inch (lbf·s/in²):

Poise References:

Pure liquid water dynamic viscosity at room temperature (0.01 P / 1 cP) 0.01 P
Commercial culinary golden pancake syrup dynamic viscosity 25 P

Pound-second/square inch References:

Pure drinking water dynamic viscosity at 20 degrees Celsius 0 lbf·s/in²
Culinary extra virgin olive oil dynamic viscosity at room temperature 1.2E-5 lbf·s/in²
Automotive engine motor oil SAE 30 dynamic viscosity at 20°C 2.9E-5 lbf·s/in²
Pure natural clover bee honey dynamic viscosity at room temperature 0.00145 lbf·s/in²

Tap any benchmark above to automatically calculate its exact equivalent in Pound-second/square inch.

ISQ Dimension: [M L⁻¹ T⁻¹] Coherent SI Unit: pascal second (Pa·s) Fluid Dynamics & Rheology

How to Convert Poise to Pound-second/square inch

Converting Poise (P) to Pound-second/square inch (lbf·s/in²) is a core calculation in Dynamic Viscosity, which quantifies a fluid's internal tangential resistance to shear deformation and laminar flow. This calculation bridges modern MKSA metric standards with the historical Gaussian centimetre-gram-second (CGS) electrostatic and electromagnetic framework. In CGS systems, electromagnetic units (such as statvolts, abvolts, dynes, ergs, and gauss) are formulated directly from mechanical dimensions, with electrostatic-to-electromagnetic relations tied to the speed of light in vacuum (c ≈ 2.99792458 × 10¹⁰ cm/s). Exactly 1 Poise translates to 1.450377 × 10⁻⁵ Pound-second/square inch (1 lbf·s/in² = 68947.590868 P).

Direct Factor1 P = 1.450377 × 10⁻⁵ lbf·s/in²

Inverse Ratio1 lbf·s/in² = 68947.590868 P

Conversion ScaleSI to CGS Gaussian / ESU / EMU Bridge

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 (pascal second (Pa·s)) 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 P = 0.1 pascal second (Pa·s)

2. Target SI Bridge (k_target):1 lbf·s/in² = 6894.759087 pascal second (Pa·s)

Step-by-step substitution for Poise → Pound-second/square inch:V(lbf·s/in²) = V(P) × ( 0.1 / 6894.759087 ) = V(P) × 1.450377 × 10⁻⁵

Mathematical FormulaValue in Pound-second/square inch = Value in Poise × 1.450377 × 10⁻⁵Direct computational formula applied for standard conversion.

Worked Example

For an engineering input of 250 P, applying the conversion factor yields exactly 0.00362594 lbf·s/in². At larger operational scale, 240 Poise corresponds to 0.0034809 lbf·s/in².

Inverse check: 1 lbf·s/in² = 68947.590868 P.

Understanding Poise and Pound-second/square inch

Domain Metrology & Engineering Applications

Governing Law & Equation

Newton's Law of Viscosity (τ = μ · du/dy)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using rotational cone-and-plate rheometers, falling ball Höppler viscometers, and vibrating wire viscometers.

Primary Industry Sectors

Applied across lubricating oil tribology (SAE engine grades), polymer extrusion, paint and coating formulation, and pharmaceutical liquid processing under international metrology standard ISO 80000-4:2019, ASTM D445.

Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-4:2019, ASTM D445 and the BIPM SI Brochure (9th Edition). Governed by Newton's Law of Viscosity (τ = μ · du/dy) under ISO 80000 dimensional vector [M L⁻¹ T⁻¹].

Multi-Variable Engineering Bridge Rheology & Fluid Boundary Layers

Dynamic to Kinematic Viscosity Bridge (m²/s • cSt • Stokes • ft²/s • in²/s • mm²/s)

Calculate fluid kinematic momentum diffusivity ν = μ / ρ across process liquids, bridging dynamic viscosity [M L⁻¹ T⁻¹] and kinematic viscosity [L² T⁻¹] via metrological density (ρ).

Input Dynamic (Absolute) Viscosity (μ): P

Select Fluid Density: 885 kg/m³

Governing Law: ν = μ / ρ

Vector: [Pa·s] ÷ [kg/m³] → [m²/s]

Live Calculated Bridge Equivalent:

1 P at Engine Lubricating Oil (SAE 30, 20°C) = 0.00011299 m²/s

Equals 112.9944 cSt • 1.1299 St • 0.001216 ft²/s

SI Kinematic Viscosity

0.00011299

m²/s

Square Meters per Second

Lubricant ISO VG

112.9944

cSt

Centistokes

CGS Viscosity

1.1299

Stokes

US Customary

0.001216

ft²/s

Square Feet per Second

Aero Hydraulics

0.18

in²/s

Square Inches per Second

ISO Viscosity

112.9944

mm²/s

Square Millimeters per Second

Step-by-Step Numerical Derivation Proof View Derivation

1. Normalize Input to SI Base Unit (Pa·s):
μ = 1 P × 0.1 = 0.1 Pa·s
2. Apply Engineering Parameter (ρ):
Selected condition: Engine Lubricating Oil (SAE 30, 20°C) at ρ = 885 kg/m³
3. Execute Governing Physical Law in SI Units:
ν = μ / ρ = (0.1 Pa·s) ÷ (885 kg/m³) = 0.00011299 m²/s
4. Convert to Standard Engineering Units:
• m²/s: 0.00011299 × 1 = 0.00011299 m²/s (Square Meters per Second) • cSt: 0.00011299 × 1000000 = 112.9944 cSt (Centistokes) • St: 0.00011299 × 10000 = 1.1299 St (Stokes) • ft²/s: 0.00011299 × 10.7639 = 0.001216 ft²/s (Square Feet per Second) • in²/s: 0.00011299 × 1550.0031 = 0.18 in²/s (Square Inches per Second) • mm²/s: 0.00011299 × 1000000 = 112.9944 mm²/s (Square Millimeters per Second)

Explore Full Density Converter →

Engineering Substance / Operating Standard	Parameter Value (kg/m³)	Reference State / Condition	Typical Industrial & Engineering Application
Water (20°C / Standard Ambient)	`998.2`	998.2 kg/m³	Hydronic HVAC & cooling water (NIST)
Engine Lubricating Oil (SAE 30, 20°C)	`885`	885.0 kg/m³	Crankcase lubrication & turbo bearing feeds
Hydraulic Oil (ISO VG 46, 20°C)	`870`	870.0 kg/m³	Industrial hydraulic systems & servo controls
Heavy Fuel Oil (Bunker C / HFO, 50°C)	`920`	920.0 kg/m³	Marine diesel engines & power plant burners
Pure Glycerol (100% C₃H₈O₃, 20°C)	`1260`	1,260.0 kg/m³	High-viscosity metrology reference fluid

Frequently Asked Questions

There are exactly 1.450377 × 10⁻⁵ pounds/second/square inch (lbf·s/in²) in 1 poise (P). To calculate larger amounts manually, simply multiply your total number of poise by the conversion multiplier of 1.450377 × 10⁻⁵.

The mathematical formula to convert poise to pounds/second/square inch is: [value] * 1.450377 × 10⁻⁵ = pounds/second/square inch. 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 pounds/second/square inch back to poise, you must divide your starting value by 1.450377 × 10⁻⁵. Our bidirectional tool automatically computes this inverse equation the moment you type into the pound-second/square inch input field.

1 Pound-second/square inch is larger than 1 Poise. Specifically, 1 Poise equals 1.450377 × 10⁻⁵ pounds/second/square inch, meaning 1 Pound-second/square inch is 68947.5909 times larger than 1 Poise (a difference of 4.84 orders of magnitude). Expressing measurements in poise requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 Poise converts to 1.450377 × 10⁻⁵ pounds/second/square inch. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.