Free Force Conversion Calculator

Value

Quick Reference

1 kN = 1,000 N • 1 MN = 1,000,000 N
1 kgf = 9.807 N • 1 lbf = 4.448 N
1 dyn = 10⁻⁵ N • 1 kip = 4,448 N
1 pdl = 0.1383 N • 1 ozf = 0.2780 N

1 kN = 1,000 N

1 lbf = 4.448 N

Enter a value and select a unit - results update automatically

This free online force conversion calculator lets you instantly switch between a wide variety of force units, including newtons, pound‑force, dynes, kilogram‑force, and many more. Whether you’re an engineer, a physics student, or simply someone who needs to convert newtons to pound‑force, kilonewtons to pound‑force (kN to lbf), newtons to kilogram‑force, or dynes to newtons, the tool delivers accurate results with just a few clicks. It covers eleven popular force units, making it a truly versatile resource for everyday calculations and technical work alike.

Supported Force Units

The converter includes the following units, each represented by its standard symbol:

Newton (N)
Kilonewton (kN)
Meganewton (MN)
Giganewton (GN)
Teranewton (TN)
Poundal (pdl)
Pound‑force (lbf)
Kip (kip), also called kip‑force (klbf)
Dyne (dyn)
Sthène (sn)
Kilopond (kp), also known as kilogram‑force (kgf)

Understanding the Newton

The newton is the SI base unit of force. It is derived from Newton’s second law of motion, which states:

F = m \cdot a

Thus one newton is defined as the force needed to accelerate a mass of one kilogram at a rate of one meter per second squared:

1\ \text{N} \equiv 1\ \text{kg} \cdot \text{m}/\text{s}^2

The unit was named after Sir Isaac Newton and was formally adopted as an SI unit in 1950. This definition forms the foundation for all force conversions.

Mass vs. Weight – Why It Matters

In everyday language, “weight” is often used to mean “mass,” but in physics the two are distinct. Mass is a measure of the amount of matter in an object and remains constant wherever the object is. Weight, on the other hand, is the gravitational force acting on that mass and varies with the local gravitational field.

On Earth, the average gravitational acceleration is $g \approx 9.81\ \text{m/s}^2$ . This means a mass of $1\ \text{kg}$ weighs approximately $9.81\ \text{N}$ . On the Moon ( $g \approx 1.62\ \text{m/s}^2$ ), the same mass would weigh only about $1.62\ \text{N}$ .

The table below illustrates this difference for several everyday objects:

Object	Mass	Weight on Earth	Weight on Moon
Apple	102 g (3.6 oz)	1.00 N	0.166 N
Bag of flour	2.27 kg (5 lb)	22.27 N	3.69 N
Dumbbells	10 kg (22.05 lb)	98.1 N	16.25 N

As the table shows, the mass stays the same while the weight (force) changes with gravity. This distinction is crucial for anyone working with force conversions.

Force Conversion Formulas

All common force units can be expressed in terms of newtons using the following relationships:

$1\ \text{kN} = 1000\ \text{N}$
$1\ \text{MN} = 10^{6}\ \text{N}$
$1\ \text{GN} = 10^{9}\ \text{N}$
$1\ \text{TN} = 10^{12}\ \text{N}$
$1\ \text{pdl} \approx 0.138255\ \text{N}$
$1\ \text{lbf} \approx 4.44822\ \text{N}$
$1\ \text{kip} = 4448.22\ \text{N}$
$1\ \text{dyn} = 10^{-5}\ \text{N}$
$1\ \text{sn} = 10^{9}\ \text{N}$ (as used in this calculator)
$1\ \text{kp}\ (\text{kgf}) = 9.80665\ \text{N}$

These conversion factors allow you to translate between any pair of units.

Other Common Force Units – Origins and Usage

Dyne (dyn)
The dyne belongs to the centimetre‑gram‑second (CGS) system, the predecessor of the SI system. Although rarely used today, it still appears in older physics texts and in surface tension measurements (e.g., dyne per centimeter).

Kilopond / Kilogram‑force (kp / kgf)
The kilopond is part of the gravitational metric system. It equals the force exerted on a one‑kilogram mass in a standard gravitational field ( $g_n = 9.80665\ \text{m/s}^2$ ). It continues to be used in specific contexts such as rocket engine thrust (notably in China and by ESA), bicycle spoke tension, archery bow draw weight, and as a reference for Vickers hardness testing.

Pound‑force (lbf)
Pound‑force is defined as the gravitational force on a one‑pound mass under Earth’s standard gravity. It is a key unit in the English Engineering and British Gravitational systems.

Poundal (pdl)
The poundal comes from the foot‑pound‑second (FPS) system. One poundal is the force needed to accelerate a one‑pound mass at one foot per second squared. It is still occasionally used in certain engineering fields.

Kip (kip)
The kip (short for “kilo‑pound”) is a US customary unit often employed in structural engineering and shipping. Note that a kip is sometimes treated as a unit of weight (deadweight) in commercial shipping contexts.

Comprehensive Conversion Table

The following table provides the full set of conversion factors among the six most common force units. The standard gravity $g_n = 9.80665\ \text{m/s}^2$ is used wherever $\equiv$ appears.

Unit	Newton (N)	Dyne (dyn)	Kilopond (kp)	Pound‑force (lbf)	Poundal (pdl)	Kip (kip)
1 N	≡ $1\ \text{kg}\cdot\text{m/s}^2$	$10^{5}\ \text{dyn}$	$0.10197\ \text{kp}$	$0.22481\ \text{lbf}$	$7.2330\ \text{pdl}$	$2.248\times10^{-4}\ \text{kip}$
1 dyn	$10^{-5}\ \text{N}$	≡ $1\ \text{g}\cdot\text{cm/s}^2$	$1.0197\times10^{-6}\ \text{kp}$	$2.2481\times10^{-6}\ \text{lbf}$	$7.2330\times10^{-5}\ \text{pdl}$	$2.2481\times10^{-9}\ \text{kip}$
1 kp	$9.80665\ \text{N}$	$9.80665\times10^{5}\ \text{dyn}$	≡ $g_n\cdot(1\ \text{kg})$	$2.2046\ \text{lbf}$	$70.932\ \text{pdl}$	$2.2046\times10^{-3}\ \text{kip}$
1 lbf	$4.448222\ \text{N}$	$4.44822\times10^{5}\ \text{dyn}$	$0.45359\ \text{kp}$	≡ $g_n\cdot(1\ \text{lb})$	$32.174\ \text{pdl}$	$0.001\ \text{kip}$
1 pdl	$0.138255\ \text{N}$	$1.3825\times10^{4}\ \text{dyn}$	$0.014098\ \text{kp}$	$0.031081\ \text{lbf}$	≡ $1\ \text{lb}\cdot\text{ft/s}^2$	$3.108\times10^{-5}\ \text{kip}$
1 kip	$4448.2216\ \text{N}$	$4.4482216\times10^{8}\ \text{dyn}$	$453.59\ \text{kp}$	$1000\ \text{lbf}$	$3.2174\times10^{4}\ \text{pdl}$	≡ $g_n\cdot(1000\ \text{lb})$

How to Use the Converter

Using the force conversion calculator is straightforward:

Select the unit you are starting from (e.g., newtons, kN, or dynes).
Enter the numeric value you wish to convert.
The tool instantly displays the equivalent value in all other supported units.

For example, if you enter 700 N, the converter returns 157.37 lbf, 5063 pdl, 71.38 kp, and the corresponding amounts in dynes, kips, etc. No manual calculations or reference tables are needed – everything is done automatically.

FAQ

1. How do I convert newtons to pound-force using this calculator?

Simply choose 'newton (N)' as the input unit, enter the value (e.g., 100 N), and the tool will show the equivalent in pound-force (lbf) along with all other units. The conversion factor is 1 lbf ≈ 4.44822 N.

2. What is the difference between mass and weight in the context of force conversion?

Mass is the amount of matter in an object and stays constant everywhere, while weight is the gravitational force acting on that mass and changes with gravity. The converter handles weight expressed in force units (N, lbf, etc.), not mass units (kg, lb).

3. How many dynes are in one newton?

One newton equals 100,000 dynes (1 N = 10⁵ dyn). This conversion factor comes from the relationship between the SI and CGS systems.

4. Can I use this converter for kN to lbf conversions?

Yes. Enter kilonewtons (kN) as the input unit. Because 1 kN = 1000 N, the tool automatically applies the correct factor to convert kN to lbf (1 kN ≈ 224.81 lbf).

How to Use

Enter a numeric value in the input field and select the force unit you want to convert from.
Click Convert to see the equivalent value in all supported force units.
Use the conversion results for your physics calculations, engineering projects, or academic needs.