Newtons to Tons-force (long) (N to tonf (UK))

1 newton equals 0.0001003611353 tons-force (long) (rounded).

How to convert newtons to tons-force (long)

To convert newtons to tons-force (long), multiply the number of newtons by 0.0001003611353. The factor is rounded to 10 significant digits. To go the other way, multiply tons-force (long) by 9,964.016418 (rounded).

tons-force (long) = newtons × 0.0001003611353

Example: 10 newtons = 0.001003611353 tons-force (long).

About these units

Newton (N)

Metric (SI)Current unit

The SI unit of force: the force that accelerates one kilogram by one meter per second squared. About the weight of a small apple.

Isaac Newton gave his name to the unit for his second law of motion, force equals mass times acceleration. Metric engineers needed a force unit that fitted the metre-kilogram-second system, and the CGPM standardized one in 1946; the 9th CGPM in 1948 adopted the name newton, with symbol N. Before that, many metric users measured force in kilograms-force, which confuses weight with mass, and CGS users had the much smaller dyne.

One newton is the force that gives a one-kilogram mass an acceleration of one meter per second every second. For scale, a 200-gram apple weighs about 1.96 N on Earth, so a newton is roughly the weight of a small apple. It equals 100,000 dynes and about 0.225 pound-force. Forces in the thousands are written in kilonewtons. Because the newton is built directly from kilograms, meters and seconds, it slots into formulas for pressure, energy and power without any conversion constants.

The newton is the reference unit for force on this site.

Sources: Wikipedia: Newton (unit); BIPM: 9th CGPM (1948), Resolution 7; Wikipedia: Centimetre-gram-second system of units

Ton-force (long) (tonf (UK))

Imperial (British)Traditional unit (still used in some regions)

2,240 pounds-force (9.964 kN), the weight of a long ton.

Weighing a British long ton of mass under standard gravity gives this unit: 2,240 pounds-force, or about 9.964 kN (the more exact figure is 9.96401641818352 kN). It belongs to the imperial family and, per Wikipedia, equals roughly 1,016.05 kilograms-force, which makes it a heavy unit suited to large structures, ships and machinery described in British units.

Confusion with its neighbours is the main hazard. The short ton-force of 2,000 lbf, common in the United States, is about 8.896 kN, so one long ton-force equals 1.12 of them. The metric tonne-force, 1,000 kgf, is 9.80665 kN, a little smaller, since the long ton-force is about 1.016 of it. NIST lists only the 2,000 lbf version, a hint of how rarely the long form is now met.

1 ton-force (long) = 9,964.016418 newtons (approximately).

Sources: Wikipedia: Ton-force; Wikipedia: Pound (force); NIST SP 811, Appendix B.8

Related conversions

See all force units.