pound force second to newton second
Convert pound force second (lbf·s) to newton second (N·s). Use an editable impulse converter, conversion formula, and reference table.
1 lbf·s = 4.448221615 N·s
Conversion formula
One pound force second equals 4.448221615 newton second. Multiply your value in pound force second by this factor to get newton second. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 pound force second:5 × 4.448221615 = 22.24110808 N·s
Conversion table
| pound force second (lbf·s) | newton second (N·s) |
|---|---|
| 0.01 | 0.04448221615 |
| 0.1 | 0.4448221615 |
| 1 | 4.448221615 |
| 2 | 8.896443231 |
| 5 | 22.24110808 |
| 10 | 44.48221615 |
| 25 | 111.2055404 |
| 50 | 222.4110808 |
| 100 | 444.8221615 |
| 1000 | 4,448.221615 |
About these measurements
Impulse is force integrated over time.
The base reference used here is the newton second. One pound force second is 4.448221615 base units; one newton second is 1 base units.
Important distinctions
Compound units must match the quantity and dimension. Temperature intervals use size factors rather than temperature offsets. Calorie and BTU entries use the explicit definitions shown.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert lbf·s to N·s?
Multiply the quantity in lbf·s by 4.448221615. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the newton second to pound force second converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
