Instantly convert any force measurement between SI, imperial, and gravitational units.
A force converter lets you switch instantly between the units engineers, scientists, and technicians use every day — from SI newtons and kilonewtons to pound-force, kips, and gravitational kilogram-force. Whether you are reviewing structural specs, sizing fasteners, or cross-checking hydraulic press ratings, one reliable tool eliminates manual conversion errors.
Force is defined by Newton's second law: F = ma, with the newton (N) as its SI unit. American industry still relies heavily on the pound-force (lbf) and its multiples — the kip (1,000 lbf) and the short ton-force (2,000 lbf) — while metric equivalents appear in international codes. This converter handles all 15 common units accurately.
All conversions pass through newtons as the pivot unit: 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 NFL offensive lineman averaging 315 lb exerts a blocking force estimated at 200–300 lbf (890–1,334 N) in a sustained drive. Sports scientists measure these forces with instrumented blocking sleds to evaluate player performance.
Each Pratt & Whitney F119 engine powering the F-22 Raptor delivers 156 kN (35,000 lbf) of afterburning thrust. Fighter jet specs are routinely quoted in both lbf and kN, requiring quick conversions for international defense procurement.
The main cables of the Golden Gate Bridge carry a tension load of approximately 129,000 kips (574,000 kN) each. US bridge design follows AASHTO standards using kips, while international analysis uses kilonewtons.
A heavy-duty wheel lug nut on a US-spec pickup truck may require 150 lb·ft of torque, corresponding to a bolt-face force near 14,000 lbf (62.3 kN) at typical thread engagement. SAE fastener specs use lbf; ISO equivalents use N or kN.
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 the dominant force unit in US mechanical, structural, and aerospace engineering.
1 kip = 1,000 lbf ≈ 4,448 N. Kips are the standard US structural engineering unit for column loads, beam reactions, and foundation pressures.
1 dyn = 10⁻⁵ N. The dyne is the CGS unit of force and still appears in surface tension and older physics literature.
1 tf (metric tonne-force) = 9,806.65 N ≈ 2,204.6 lbf. Tonne-force is used for crane certifications, press capacity ratings, and heavy-lift rigging tables.
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) equals 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 kip (kilopound) equals 1,000 lbf ≈ 4,448.2 N. It is the standard unit of force in US structural engineering — column loads, beam end reactions, and pile capacities are all routinely expressed in kips in ASCE and AISC design documents.
A short ton-force is based on the US short ton of 2,000 lb, giving 1 tnf ≈ 8,896 N. A long ton-force uses the UK long ton of 2,240 lb, giving 1 ltf ≈ 9,964 N — about 11.9% larger. The distinction matters in heavy-lift crane certifications and shipping.
Weight is a specific force — the gravitational force acting on a mass. On Earth, a 1 kg object weighs approximately 9.81 N (1 kgf). Mass (in kg or lb) is constant; weight (in N or lbf) varies with local gravity.
All conversion factors are sourced from NIST, the SI Brochure, and IEEE/ASTM standards. Results are accurate to at least 10 significant figures — well beyond the precision needed for 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.