Convert poundal [pdl] to ton-force (metric) [tf] Online | Free force Converter

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Poundal [pdl]


The poundal is a unit of force in the foot-pound-second (FPS) system, mainly used in the United States.



  • It is defined as the force required to accelerate a one-pound mass by one foot per second squared.



  • Mathematically:



1 pdl=1 lb×1 ft/s2=0.138255 newtons1 \text{ pdl} = 1 \text{ lb} \times 1 \text{ ft/s}^2 = 0.138255 \text{ newtons}

  • The poundal is smaller than the pound-force since Earth's gravity accelerates a pound mass at approximately 32.174 ft/s², making:



1 lbf=32.174 pdl1 \text{ lbf} = 32.174 \text{ pdl}

  • It is mostly of historical interest and rarely used in modern engineering but can appear in classical mechanics problems using the FPS system.


Ton-Force (Metric) [tf]


Ton-force (metric), also called tonne-force or metric ton-force (tf), is a unit of force based on the force exerted by one metric ton (1,000 kilograms) under standard gravity.



  • Defined as the force exerted by a mass of 1 metric ton under Earth's gravity (9.80665 m/s²).



  • Mathematically:



1 tf=1,000 kg×9.80665 m/s2=9,806.65 N1 \text{ tf} = 1,000 \text{ kg} \times 9.80665 \text{ m/s}^2 = 9,806.65 \text{ N}

  • Though not an SI unit, it is widely used in engineering and heavy industries to measure large forces.



Example: A force of 5 tf corresponds to approximately 49,033 newtons.



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