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Convert Pound-force Seconds per Square Inch to Poundal Seconds per Square Foot

Pound-force Second per Square Inch (lbf·s/in²) to Poundal Second per Square Foot (pdl·s/ft²) dynamic viscosity conversion — enter any value below to get an instant result, or use the table for common values.

Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.

The numeric value you want to convert. Decimals are accepted.

Result

1 lbf·s/in² = 4633.063 pdl·s/ft²

1 Pound-force Second per Square Inch = 4633.063 Poundal Seconds per Square Foot

1 Poundal Second per Square Foot = 0.00021583993 Pound-force Seconds per Square Inch

1 lbf·s/in² in every supported unit

Conversion chart: Pound-force Second per Square Inch to Poundal Seconds per Square Foot

Conversion table

Pound-force Second per Square Inch (lbf·s/in²) Poundal Second per Square Foot (pdl·s/ft²)
0.01 lbf·s/in² 46.33063 pdl·s/ft²
0.1 lbf·s/in² 463.3063 pdl·s/ft²
1 lbf·s/in² 4633.063 pdl·s/ft²
2 lbf·s/in² 9266.126 pdl·s/ft²
3 lbf·s/in² 13899.189 pdl·s/ft²
5 lbf·s/in² 23165.315 pdl·s/ft²
10 lbf·s/in² 46330.63 pdl·s/ft²
20 lbf·s/in² 92661.26 pdl·s/ft²
50 lbf·s/in² 231653.15 pdl·s/ft²
100 lbf·s/in² 463306.3 pdl·s/ft²
1000 lbf·s/in² 4633063 pdl·s/ft²

Pound-force Second per Square Inch (lbf·s/in²)

Definition: A US customary unit of dynamic viscosity, also known as the 'reyn' in lubrication engineering, built from pound-force, second, and square inch.

History: Named informally after Osborne Reynolds, the pioneer of fluid dynamics research; it became the standard unit in American bearing and lubrication engineering.

Current use: Used almost exclusively in US hydrodynamic lubrication and bearing design calculations, where oil viscosity must match pound-force and inch-based load and geometry figures.

Poundal Second per Square Foot (pdl·s/ft²)

Definition: A US customary unit of dynamic viscosity built from the poundal, the absolute (mass-based) unit of force in the foot-pound-second system, rather than the gravitational pound-force.

History: Reflects the foot-pound-second 'absolute' system used in some 19th and early 20th century British and American engineering texts as an alternative to gravitational force units.

Current use: Rare today; occasionally found in older engineering references that used the absolute foot-pound-second system rather than the gravitational pound-force system.

Supported Units

Unit Symbol In Pa·s
Pascal Second Pa·s 1 Pa·s
Newton Second per Square Meter N·s/m² 1 Pa·s
Millinewton Second per Square Meter mN·s/m² 0.001 Pa·s
Kilogram-force Second per Square Meter kgf·s/m² 9.80665 Pa·s
Poise P 0.1 Pa·s
Centipoise cP 0.001 Pa·s
Millipoise mP 0.0001 Pa·s
Kilopoise kP 100 Pa·s
Dyne Second per Square Centimeter dyn·s/cm² 0.1 Pa·s
Gram per Centimeter per Second g/(cm·s) 0.1 Pa·s
Pound-force Second per Square Inch lbf·s/in² 6894.7573 Pa·s
Pound-force Second per Square Foot lbf·s/ft² 47.880259 Pa·s
Poundal Second per Square Foot pdl·s/ft² 1.4881639 Pa·s
Pound per Foot per Second lb/(ft·s) 1.4881639 Pa·s
Pound per Foot per Hour lb/(ft·h) 0.0004133789 Pa·s

About These Parameters

Value
The dynamic viscosity value you want to convert, expressed in the "From" unit. Accepts decimals.
From Unit
The unit your input value is currently measured in — a viscometer's centipoise reading, or an engineering spec's Pa·s.
To Unit
The unit you want the result converted into. Use the swap button to flip From and To instantly.

How Viscosity - Dynamic Conversion Works

The Formula

Every unit here is defined by a fixed multiplier relative to the pascal second. To convert a value from one unit to another:

result = value × (factor of "From" unit ÷ factor of "To" unit)

For Pound-force Second per Square Inch → Poundal Second per Square Foot: multiply by 4633.063. For example, 1 lbf·s/in² × 4633.063 = 4633.063 pdl·s/ft².

Dynamic Viscosity vs. Kinematic Viscosity

This page converts DYNAMIC (absolute) viscosity — the pure resistance-to-shear property of a fluid, independent of how heavy that fluid is. The site's separate Viscosity - Kinematic Converter covers a related but different quantity: kinematic viscosity equals dynamic viscosity divided by the fluid's density. Because that division depends on a specific fluid's density at a specific temperature, there is no fixed multiplier that converts a dynamic-viscosity unit directly into a kinematic-viscosity unit the way this page converts between, say, pascal seconds and poise — you need to know the fluid's density first.

Poise and Centipoise

Although the pascal second is the modern SI unit, the CGS-era poise and, especially, the centipoise remain the units most commonly quoted in industry and on viscometer readouts. Water at room temperature (about 20°C) has a dynamic viscosity of almost exactly 1 centipoise, which makes it a convenient mental reference point: a fluid rated at 10 cP is roughly ten times "thicker" than water, one rated at 100,000 cP behaves more like honey or ketchup.

Example

A dynamic viscosity of 1 lbf·s/in² equals 4633.063 pdl·s/ft². For scale, water at room temperature is about 1 cP (0.001 Pa·s), typical motor oil at operating temperature runs from roughly 50 to 300 cP, and honey can measure anywhere from 2,000 to 10,000 cP depending on temperature and water content.

Frequently Asked Questions

How many Poundal Seconds per Square Foot are in 1 Pound-force Second per Square Inch?

1 Pound-force Second per Square Inch (lbf·s/in²) equals exactly 4633.063 Poundal Seconds per Square Foot (pdl·s/ft²).

What is dynamic viscosity?

Dynamic (absolute) viscosity is a measure of a fluid's resistance to shear or flow — how much internal friction it has as one layer of fluid slides past another. It's what makes honey pour slower than water, and it's typically measured with a viscometer in units like pascal seconds or centipoise.

How is dynamic viscosity different from kinematic viscosity?

Dynamic viscosity measures pure resistance to shear. Kinematic viscosity is dynamic viscosity divided by the fluid's density, and is used mainly in flow calculations where gravity and inertia matter (e.g. how a fluid drains under its own weight). Converting between the two requires knowing the specific fluid's density, so this page and the site's Viscosity - Kinematic Converter are kept separate.

Why is centipoise still used instead of the SI pascal second?

Centipoise predates the pascal second and happens to land on convenient, easy-to-read numbers for common fluids — water is about 1 cP, light oils are tens of cP, heavy syrups are thousands of cP — so most viscometers, product data sheets, and industry standards continued reporting in cP even after SI officially adopted the pascal second.

How accurate are these conversions?

Every conversion factor used here is the exact, internationally recognized relationship between the underlying force, time, and area units — results are limited only by floating-point display precision, not by rounded conversion constants.

Convert Pound-force Second per Square Inch to Other Dynamic Viscosity Units

Pound-force Second per Square Inch to Pascal Seconds Pound-force Second per Square Inch to Newton Seconds per Square Meter Pound-force Second per Square Inch to Millinewton Seconds per Square Meter Pound-force Second per Square Inch to Kilogram-force Seconds per Square Meter Pound-force Second per Square Inch to Poises Pound-force Second per Square Inch to Centipoises Pound-force Second per Square Inch to Millipoises Pound-force Second per Square Inch to Kilopoises Pound-force Second per Square Inch to Dyne Seconds per Square Centimeter Pound-force Second per Square Inch to Grams per Centimeter per Second Pound-force Second per Square Inch to Pound-force Seconds per Square Foot Pound-force Second per Square Inch to Poundal Seconds per Square Foot Pound-force Second per Square Inch to Pounds per Foot per Second Pound-force Second per Square Inch to Pounds per Foot per Hour

Possible Dynamic Viscosity Conversions

Pound-force Second per Square Inch to Kilopoises Millipoise to Pounds per Foot per Hour Pound per Foot per Hour to Centipoises Pound per Foot per Second to Millipoises Pound-force Second per Square Foot to Millipoises Pound-force Second per Square Foot to Kilogram-force Seconds per Square Meter Kilogram-force Second per Square Meter to Centipoises Newton Second per Square Meter to Dyne Seconds per Square Centimeter Pound per Foot per Second to Centipoises Gram per Centimeter per Second to Pounds per Foot per Hour Kilogram-force Second per Square Meter to Pascal Seconds Millipoise to Poises Millipoise to Centipoises Millinewton Second per Square Meter to Kilogram-force Seconds per Square Meter Kilogram-force Second per Square Meter to Pound-force Seconds per Square Foot Millipoise to Newton Seconds per Square Meter Pound-force Second per Square Inch to Centipoises Kilopoise to Dyne Seconds per Square Centimeter Millipoise to Pounds per Foot per Second Pound-force Second per Square Inch to Newton Seconds per Square Meter Poise to Pascal Seconds Millinewton Second per Square Meter to Poises Gram per Centimeter per Second to Kilogram-force Seconds per Square Meter Poundal Second per Square Foot to Newton Seconds per Square Meter Dyne Second per Square Centimeter to Pound-force Seconds per Square Inch Centipoise to Pounds per Foot per Hour Pound-force Second per Square Foot to Grams per Centimeter per Second Newton Second per Square Meter to Pounds per Foot per Hour Newton Second per Square Meter to Poises Pascal Second to Grams per Centimeter per Second Pascal Second to Poundal Seconds per Square Foot Pound-force Second per Square Foot to Newton Seconds per Square Meter Newton Second per Square Meter to Centipoises Pound-force Second per Square Foot to Pound-force Seconds per Square Inch Pascal Second to Millinewton Seconds per Square Meter Poundal Second per Square Foot to Grams per Centimeter per Second Dyne Second per Square Centimeter to Pascal Seconds Poundal Second per Square Foot to Pascal Seconds Kilogram-force Second per Square Meter to Pound-force Seconds per Square Inch Newton Second per Square Meter to Kilopoises Centipoise to Pounds per Foot per Second Pound per Foot per Hour to Millinewton Seconds per Square Meter Pound-force Second per Square Inch to Pounds per Foot per Second Poundal Second per Square Foot to Dyne Seconds per Square Centimeter Pound per Foot per Hour to Millipoises Centipoise to Poises Kilopoise to Kilogram-force Seconds per Square Meter Pound per Foot per Second to Dyne Seconds per Square Centimeter Pound-force Second per Square Foot to Poundal Seconds per Square Foot Gram per Centimeter per Second to Pound-force Seconds per Square Foot Millinewton Second per Square Meter to Dyne Seconds per Square Centimeter Poundal Second per Square Foot to Pounds per Foot per Hour Dyne Second per Square Centimeter to Newton Seconds per Square Meter Dyne Second per Square Centimeter to Millipoises Millinewton Second per Square Meter to Pounds per Foot per Hour Dyne Second per Square Centimeter to Kilogram-force Seconds per Square Meter Gram per Centimeter per Second to Newton Seconds per Square Meter Millinewton Second per Square Meter to Pascal Seconds Gram per Centimeter per Second to Dyne Seconds per Square Centimeter Poise to Millipoises Poise to Poundal Seconds per Square Foot Kilogram-force Second per Square Meter to Pounds per Foot per Second Pound-force Second per Square Foot to Dyne Seconds per Square Centimeter Pound per Foot per Second to Newton Seconds per Square Meter Pascal Second to Pound-force Seconds per Square Inch Millipoise to Pascal Seconds Kilogram-force Second per Square Meter to Millinewton Seconds per Square Meter Pound-force Second per Square Inch to Grams per Centimeter per Second Centipoise to Kilopoises Newton Second per Square Meter to Pascal Seconds Millinewton Second per Square Meter to Pounds per Foot per Second Gram per Centimeter per Second to Pounds per Foot per Second Pound-force Second per Square Inch to Poises Poundal Second per Square Foot to Centipoises Kilogram-force Second per Square Meter to Pounds per Foot per Hour Kilogram-force Second per Square Meter to Dyne Seconds per Square Centimeter Millipoise to Kilogram-force Seconds per Square Meter Pound per Foot per Hour to Dyne Seconds per Square Centimeter Kilopoise to Pascal Seconds Poundal Second per Square Foot to Pound-force Seconds per Square Foot Newton Second per Square Meter to Pounds per Foot per Second Dyne Second per Square Centimeter to Poundal Seconds per Square Foot Kilogram-force Second per Square Meter to Poises Pound-force Second per Square Inch to Poundal Seconds per Square Foot Pascal Second to Kilopoises Kilopoise to Pounds per Foot per Second Millinewton Second per Square Meter to Kilopoises Kilopoise to Millipoises Pascal Second to Kilogram-force Seconds per Square Meter Poise to Pounds per Foot per Hour Pound-force Second per Square Foot to Centipoises Pound-force Second per Square Foot to Poises Kilopoise to Grams per Centimeter per Second Pound-force Second per Square Foot to Pascal Seconds Pound per Foot per Second to Grams per Centimeter per Second Millipoise to Poundal Seconds per Square Foot Pound-force Second per Square Inch to Millinewton Seconds per Square Meter Gram per Centimeter per Second to Pascal Seconds Poundal Second per Square Foot to Poises Millinewton Second per Square Meter to Pound-force Seconds per Square Inch Pound per Foot per Hour to Poundal Seconds per Square Foot Centipoise to Dyne Seconds per Square Centimeter Pound per Foot per Second to Pound-force Seconds per Square Inch Millinewton Second per Square Meter to Millipoises Poundal Second per Square Foot to Pounds per Foot per Second Dyne Second per Square Centimeter to Grams per Centimeter per Second Pound per Foot per Second to Kilogram-force Seconds per Square Meter Millinewton Second per Square Meter to Newton Seconds per Square Meter Newton Second per Square Meter to Grams per Centimeter per Second Millipoise to Grams per Centimeter per Second Pound per Foot per Second to Poundal Seconds per Square Foot Pound per Foot per Hour to Pound-force Seconds per Square Inch Millipoise to Pound-force Seconds per Square Inch Poise to Pounds per Foot per Second Gram per Centimeter per Second to Poundal Seconds per Square Foot Newton Second per Square Meter to Kilogram-force Seconds per Square Meter Kilogram-force Second per Square Meter to Millipoises Dyne Second per Square Centimeter to Poises Poundal Second per Square Foot to Millipoises Kilopoise to Newton Seconds per Square Meter Millipoise to Pound-force Seconds per Square Foot Kilopoise to Millinewton Seconds per Square Meter Pound per Foot per Second to Pound-force Seconds per Square Foot Centipoise to Kilogram-force Seconds per Square Meter Centipoise to Pound-force Seconds per Square Inch Gram per Centimeter per Second to Pound-force Seconds per Square Inch Pound-force Second per Square Inch to Pound-force Seconds per Square Foot Poise to Kilogram-force Seconds per Square Meter Pound-force Second per Square Foot to Pounds per Foot per Hour Centipoise to Pascal Seconds Poundal Second per Square Foot to Kilogram-force Seconds per Square Meter Pound per Foot per Second to Pounds per Foot per Hour Dyne Second per Square Centimeter to Kilopoises Gram per Centimeter per Second to Kilopoises Newton Second per Square Meter to Pound-force Seconds per Square Foot Pascal Second to Millipoises Poise to Grams per Centimeter per Second Pound-force Second per Square Foot to Millinewton Seconds per Square Meter Newton Second per Square Meter to Millinewton Seconds per Square Meter Kilopoise to Pound-force Seconds per Square Foot Pascal Second to Pounds per Foot per Second Pascal Second to Pound-force Seconds per Square Foot Newton Second per Square Meter to Poundal Seconds per Square Foot Poise to Millinewton Seconds per Square Meter Poundal Second per Square Foot to Kilopoises Dyne Second per Square Centimeter to Millinewton Seconds per Square Meter Kilogram-force Second per Square Meter to Grams per Centimeter per Second Centipoise to Newton Seconds per Square Meter Millipoise to Dyne Seconds per Square Centimeter Newton Second per Square Meter to Millipoises Kilopoise to Pound-force Seconds per Square Inch Pound per Foot per Hour to Poises Gram per Centimeter per Second to Centipoises Pound per Foot per Hour to Grams per Centimeter per Second Poundal Second per Square Foot to Millinewton Seconds per Square Meter Poise to Pound-force Seconds per Square Foot Dyne Second per Square Centimeter to Pounds per Foot per Hour Dyne Second per Square Centimeter to Pounds per Foot per Second Pound-force Second per Square Inch to Millipoises Dyne Second per Square Centimeter to Pound-force Seconds per Square Foot Pascal Second to Dyne Seconds per Square Centimeter Pound per Foot per Second to Pascal Seconds Pound per Foot per Second to Kilopoises Kilogram-force Second per Square Meter to Newton Seconds per Square Meter Pound-force Second per Square Inch to Pounds per Foot per Hour Gram per Centimeter per Second to Millinewton Seconds per Square Meter Kilogram-force Second per Square Meter to Kilopoises Pound per Foot per Hour to Pounds per Foot per Second Millipoise to Kilopoises Gram per Centimeter per Second to Millipoises Gram per Centimeter per Second to Poises Millinewton Second per Square Meter to Grams per Centimeter per Second Poundal Second per Square Foot to Pound-force Seconds per Square Inch Poise to Dyne Seconds per Square Centimeter Kilopoise to Pounds per Foot per Hour Newton Second per Square Meter to Pound-force Seconds per Square Inch Pascal Second to Newton Seconds per Square Meter Millipoise to Millinewton Seconds per Square Meter Pascal Second to Centipoises Pound per Foot per Hour to Pascal Seconds Pound-force Second per Square Foot to Kilopoises Pound-force Second per Square Inch to Pascal Seconds Pound-force Second per Square Inch to Dyne Seconds per Square Centimeter Pound per Foot per Second to Millinewton Seconds per Square Meter Poise to Pound-force Seconds per Square Inch Kilopoise to Centipoises Pound per Foot per Hour to Newton Seconds per Square Meter Centipoise to Poundal Seconds per Square Foot Poise to Newton Seconds per Square Meter Pound per Foot per Second to Poises Centipoise to Millinewton Seconds per Square Meter Pound per Foot per Hour to Kilogram-force Seconds per Square Meter Kilopoise to Poundal Seconds per Square Foot Centipoise to Grams per Centimeter per Second Poise to Centipoises Pound per Foot per Hour to Pound-force Seconds per Square Foot Millinewton Second per Square Meter to Pound-force Seconds per Square Foot Poise to Kilopoises Pascal Second to Poises Pound per Foot per Hour to Kilopoises Centipoise to Millipoises Millinewton Second per Square Meter to Poundal Seconds per Square Foot Dyne Second per Square Centimeter to Centipoises Millinewton Second per Square Meter to Centipoises Pound-force Second per Square Inch to Kilogram-force Seconds per Square Meter Pascal Second to Pounds per Foot per Hour Pound-force Second per Square Foot to Pounds per Foot per Second Kilopoise to Poises Kilogram-force Second per Square Meter to Poundal Seconds per Square Foot Centipoise to Pound-force Seconds per Square Foot

See also