In 1 pound of force there are 0.000454 tonne-force. Meanwhile in 1 tonne-force there are 2,204.622431 pound of force. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Tonne-force to Pound of force calculator above to convert any number.
* Values rounded to 6 decimal places for readability
Pound-force (lbf) is a unit of force, based on Earth’s gravity acting on a 1-pound mass. It’s not the same as a foot-pound, which measures energy.
To convert pound-force to tonne-force (tf), use this fixed ratio:
Conversion formula (lbf to tf):
Quick example:
For clean results, keep a few decimal places, then round as needed.
1 lbf equals 0.00045359237 tf.
This is the same as saying 1 tf equals 2,204.62262185 lbf.
Use this formula:
tonne-force (tf) = pound-force (lbf) ÷ 2,204.62262185
You can also multiply:
tonne-force (tf) = pound-force (lbf) × 0.00045359237
Tonne-force is based on the force from 1 metric tonne under standard gravity.
A metric tonne equals 1,000 kg, which equals 2,204.62262185 lb in mass.
Because both lbf and tf use the same standard gravity, the gravity part cancels out, leaving the mass ratio.
Yes. Tonne-force (tf) and metric ton-force mean the same unit.
They both refer to the force equal to the weight of one metric tonne under standard gravity.
No. A ton-force often means short ton-force in US use.
Always check whether “ton” means metric tonne, short ton, or long ton.
At standard gravity, 1 lb of mass weighs about 1 lbf, but they are not the same unit.
Yes, as long as you use the common definitions of lbf and tf that rely on standard gravity.
That’s why the conversion is a fixed number: 1 lbf = 0.00045359237 tf.
1 tf = 2,204.62262185 lbf.
This value is used for both quick checks and precise conversions.
Here are a few:
This conversion comes up in fields that mix US and metric force units, such as:
You may see these:
If a document uses tf, confirm it means tonne-force and not another “ton-force” type.
The Calculate Box tool to convert pound of force to tonne-force uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a pound of force value in the box and have it instantly converted to tonne-force.