N Newtons To Lbs
Dedicated converter

lbs ft to newtons

“Lbs ft” is torque — a twisting force — and its SI counterpart is the newton-meter, not the plain newton. Enter a pound-feet value and this converter returns newton-meters using the exact defined factor.

The Converter

lb·ft → N·m
lb·ft
N·m
Precision
Quick values

Total Working

Formula T(N·m) = T(lb·ft) × 1.3558179483
Substitute
Result
1 lb·ft = 1.3558179483 N·m
Pound-feet (lb·ft) Newton-meters (N·m)
1 1.3558
5 6.7791
10 13.5582
20 27.1164
50 67.7909
100 135.5818
150 203.3727
250 338.9545
500 677.909
1,000 1,355.8179

The exact factor

1 lb·ft = 1.3558179483 N·m

Derived from the defined constants 1 lb = 0.45359237 kg and gₙ = 9.80665 m/s² — no measurement error, only display rounding.

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How to convert lbs ft to newtons (newton-meters)

Multiply pound-feet by 1.3558179483. The factor is the product of the two underlying conversions: 1 lbf = 4.4482216 N and 1 ft = 0.3048 m, so 1 lb·ft = 4.4482216 × 0.3048 = 1.3558179 N·m.

Example: a wheel-nut spec of 80 lb·ft equals 80 × 1.35582 = 108.47 N·m — the number you would dial into a metric torque wrench.

Why torque needs the extra unit

Torque is force times lever length, so its units always pair a force with a distance. A plain newton cannot express torque on its own — when people say “lbs ft to newtons” they almost always mean lb·ft to N·m, which is what this page computes.

If you actually need straight force conversion (lbf to N), use our Pounds to Newtons converter instead.

Questions, answered

Frequently asked

How many newton-meters is 1 lb·ft? +
Exactly 1.3558179483 N·m. The reverse factor is 1 N·m = 0.7375621 lb·ft.
Is lb·ft the same as ft·lb? +
For tightening torque, yes — both mean pound-force acting on a one-foot lever. (In physics, foot-pound is also used for energy, but torque wrenches use them interchangeably.)
What is 100 lbs ft in newton-meters? +
100 × 1.3558179 = 135.58 N·m.
The collection

Every converter

Dedicated pages for every force, torque, and pressure conversion — each with its own calculator, exact factor, and worked examples.

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