Convert Pound-inches to Ounce-inches

Formula

ozf·in = lbf·in × 16

Derivation from SI units:

• 1 lbf·in = 4.4482216152605 N × 0.0254 m = 0.1129848290276 N·m
• 1 ozf·in = 1/16 lbf·in = 0.00706155181 N·m
• 1 lbf·in = 0.1129848290276 N·m ÷ 0.007061551814226 N·m per ozf·in = 16 ozf·in

Both units are defined exactly, so the factor is exact. Pound-inch definition: pound-inch; Ounce-inch definition: ounce-inch.

Worked examples

1. A reading of 25 lbf·in converts to 400 ozf·in.
   25 lbf·in × 16 = 400 ozf·in
2. A value of 75 lbf·in is 1200 ozf·in.
   75 lbf·in × 16 = 1200 ozf·in

Where it's used

Pound-inches are used for small fastener and electrical-terminal torques, while ounce-inches appear in stepper and servo motor holding torque. Both measure torque (moment of force), so the conversion is a fixed factor.

Pound-inch to other torque units

Frequently asked questions

Sources

• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "pound-force inch (lbf·in)".
• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "ounce (avoirdupois)-force inch".

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.