Instantly convert any force measurement between SI, imperial, and gravitational units.
A force converter lets you switch between the many units used to express force — from the SI newton and kilonewton, through the gravitational kilogram-force and tonne-force, to the imperial pound-force and kip. Whether you are working in structural engineering, mechanical design, or everyday physics, having a single tool that handles all these systems instantly removes conversion errors.
Force is a vector quantity describing any push or pull on an object. Its SI unit is the newton (N), defined as the force needed to accelerate a 1 kg mass at 1 m/s². Many industries still rely on older gravitational units such as kilogram-force (kgf) or pound-force (lbf), so a reliable converter is essential for cross-disciplinary and cross-regional work.
All conversions pass through newtons as the pivot unit: first multiply the source value by its conversion factor to obtain newtons, then divide by the target unit's factor.
where f is the number of newtons per unit. For example, 1 lbf = 4.44822 N and 1 kgf = 9.80665 N.
An adult weighing 175 lb exerts a gravitational force of roughly 778 N (175 lbf ≈ 778.4 N) on the ground. This equivalence is fundamental in biomechanics, ergonomics, and structural floor-loading calculations across North America.
A mid-size American V6 engine producing 300 lb·ft of torque exerts a tangential force of about 1,334 N at a 1 m moment arm. Engine specifications in the US are routinely given in pound-force feet, requiring conversion for metric engineering analysis.
Each Space Shuttle Main Engine (SSME) produced a vacuum thrust of approximately 2,090 kN (470,000 lbf). Comparing rocket thrust across nations requires quick conversion between kilonewtons and pound-force.
A 1/2-inch Grade 8 bolt has a proof load of roughly 12,000 lbf (≈ 53.4 kN). Structural engineers and mechanics use lbf in ASTM standards, while ISO standards specify the equivalent in kN, making accurate conversion critical for safety.
Type any force value into the input field at the top of the converter.
Select the unit your value is in using the dropdown — all 15 units are listed with their symbols.
The seven primary result cards update instantly showing newtons, kilonewtons, dynes, pound-force, gram-force, kilogram-force, and tonne-force.
Click 'More force units' to expand the additional section and see meganewtons, giganewtons, millinewtons, micronewtons, ounce-force, kips, short ton-force, and long ton-force.
To convert in the other direction, simply choose a new source unit and enter a new value — results refresh immediately.
1 kgf = 9.80665 N exactly. This is the standard gravity used to define gravitational force units — it equals the mean gravitational acceleration at Earth's surface.
1 lbf ≈ 4.44822 N. Pound-force is widely used in the US and UK for structural loads, bolt tensions, and tire pressure specifications.
1 kip = 1,000 lbf ≈ 4,448 N. Kips are standard in US structural engineering for column loads and beam reactions.
1 dyn = 10⁻⁵ N. The dyne is the CGS unit of force and is still encountered in surface tension measurements and older physics literature.
1 tf (metric tonne-force) = 9,806.65 N ≈ 2,204.6 lbf. Tonne-force is commonly used for crane ratings, hydraulic press capacities, and bridge load limits.
A newton is the SI unit defined by Newton's second law: F = ma, so 1 N = 1 kg·m/s². A kilogram-force (kgf) is a gravitational unit equal to the weight of a 1 kg mass under standard gravity (9.80665 m/s²), giving 1 kgf = 9.80665 N. The newton is independent of gravity; the kilogram-force is not.
Multiply the pound-force value by 4.4482216152605 to get newtons. For example, 100 lbf × 4.4482 ≈ 444.8 N. Conversely, divide newtons by 4.4482 to get pound-force.
A dyne is the CGS (centimetre-gram-second) unit of force, equal to 10⁻⁵ N. It is rarely used in modern engineering but still appears in surface tension measurements (expressed in dynes per centimetre), older physics textbooks, and some fields of biology.
A short ton-force (tnf) is based on the US short ton of 2,000 lb, giving 1 tnf ≈ 8,896 N. A long ton-force (ltf) uses the UK long ton of 2,240 lb, giving 1 ltf ≈ 9,964 N. The difference is about 11.9%, which matters in heavy-lift and structural contexts.
Weight is a type of force — specifically the gravitational force acting on a mass. On Earth's surface, a 1 kg object has a weight of approximately 9.81 N (1 kgf). However, mass (in kg) and weight (in N or kgf) are conceptually distinct: mass is constant, while weight depends on local gravitational acceleration.
All conversion factors are taken from international standards (NIST, SI Brochure, IEEE/ASTM). Results are accurate to at least 10 significant figures, which exceeds the precision required for virtually any practical engineering or scientific application.
This converter is provided for informational and educational purposes. For safety-critical engineering, structural, or legal applications, always verify force values with certified instruments and consult a qualified professional.