In 1 tonne-force there are 70,931.611877 poundals. Meanwhile in 1 poundals there are 0.0000140981 tonne-force. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Poundals to Tonne-force calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert tonne-force to poundals, use a fixed conversion factor based on standard gravity.
Conversion formula (tf to pdl):
poundals (pdl) = tonne-force (tf) × 70,930.73
Quick examples (1 to 10 tf):
Use this factor anytime you need a clear tonne-force to poundal conversion.
Tonne-force is a unit of force based on weight. It equals the force from gravity on a 1-metric-ton mass under standard gravity. You may also see it written as metric ton-force.
A poundal is a unit of force from the foot-pound-second (FPS) system. It’s defined as the force needed to speed up a 1-pound mass by 1 foot per second squared.
1 tonne-force equals about 70,931.6 poundals.
Use this direct conversion:
This uses standard gravity and standard unit definitions.
Use the reverse conversion:
Not always. Tonne-force is based on the metric tonne (1,000 kg).
“Ton-force” can mean force based on a short ton (2,000 lb) or a long ton (2,240 lb), depending on the context. The values will not match.
Tonne-force is tied to standard gravity (g₀ = 9.80665 m/s²). That fixed value sets:
Once tf is in newtons, it converts cleanly to poundals.
They convert through newtons:
So:
Yes. Multiply by 70,931.6:
Rounding depends on your use. For many loads and force checks, rounding to the nearest whole poundal is fine. For lab work or detailed math, keep more digits (at least 1 decimal place, often more).
No. The newton (N) is the SI unit of force.
Tonne-force is a gravity-based unit, and the poundal is an older FPS unit. You’ll still see both in some reference tables and older specs.
Common symbols are:
The Calculate Box tool to convert tonne-force to poundals uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a tonne-force value in the box and have it instantly converted to poundals.