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Nm to lb-ft Converter

Convert newton-metres to pound-feet — engine torque, wheel nuts, bolt specs.

Torque is the twisting force that turns bolts tight and engines powerful. Engine specs use Nm or lb-ft; bolt torque specs use Nm, lb-ft, or kgf·m; tiny fasteners use in-lb or Nm. This converter handles all of them instantly.

400 Nm
295.024 lb-ft
UnitValue
Nm400 Nm
lb-ft295.024 lb-ft
kgf·m40.789 kgf·m
in-lb3,540.293 in-lb

Nm vs lb-ft: Which Is Bigger?

One lb-ft is larger than one Nm. To convert Nm to lb-ft, divide by 1.35582 — so a 400 Nm engine produces about 295 lb-ft. European car specs quote Nm; US specs quote lb-ft.

  • 1 lb-ft = 1.35582 Nm
  • 1 Nm = 0.73756 lb-ft
  • Quick mental math: Nm ÷ 1.35 ≈ lb-ft (within 0.4%)
  • Or: lb-ft × 1.35 ≈ Nm
  • 300 Nm ≈ 221 lb-ft (typical 2.0T engine)
  • 500 Nm ≈ 369 lb-ft (typical V8 or diesels)
  • 1,000 Nm ≈ 738 lb-ft (performance diesels and electric motors)

Wheel Nut Torque: Why It Matters

Under-torqued wheel nuts can loosen while driving; over-torqued ones can stretch or shear the wheel stud, crack alloy wheels, or make future removal impossible. Always use the manufacturer's specified torque — it's in your owner's manual or on a sticker in the glove box.

  • Typical passenger car: 90–140 Nm (66–103 lb-ft)
  • SUVs and trucks: 120–170 Nm (88–125 lb-ft)
  • Sports cars with large-diameter studs: 140–160 Nm
  • Always torque in a star pattern for even seating
  • Re-torque after 50–100 km if you've fitted new wheels
  • Impact guns should be followed by a torque wrench for final setting

Common Fastener Torque Reference

General metric bolt torque specs (grade 8.8, lubricated). Always use the actual manufacturer spec where available — this is a rough reference only.

  • M6 bolt (8.8): ~10 Nm (7 lb-ft)
  • M8 bolt (8.8): ~25 Nm (18 lb-ft)
  • M10 bolt (8.8): ~50 Nm (37 lb-ft)
  • M12 bolt (8.8): ~87 Nm (64 lb-ft)
  • Spark plugs (M14, aluminium head): ~25–30 Nm (18–22 lb-ft)
  • Brake caliper bolts: varies 25–120 Nm depending on design

How to Convert Nm to lb-ft

Instant torque conversion for engines and fasteners.

  1. 1
    Enter your torque value
    Type the torque figure and select the source unit (Nm, lb-ft, kgf·m, or in-lb).
  2. 2
    Read the conversion
    The table shows Nm, lb-ft, kgf·m, and in-lb simultaneously. The primary result shows the most common conversion for your input.
  3. 3
    Quick check
    Nm ÷ 1.356 ≈ lb-ft. Or use in-lb ÷ 12 to get lb-ft for small fasteners.

FAQ

How do I convert Nm to lb-ft?
Divide Nm by 1.35582. 400 Nm ÷ 1.35582 ≈ 295.0 lb-ft.
What's the right wheel-nut torque?
Most passenger cars: 90–140 Nm (65–105 lb-ft). SUVs and trucks go higher. Always consult your owner's manual — alloy wheels and factory hubs can vary.
kgf·m vs Nm — are they close?
Close but not equal. 1 kgf·m = 9.80665 Nm. Older Japanese and European spec sheets often use kgf·m.
What torque wrench setting should I use for spark plugs?
Typically 15–30 Nm (11–22 lb-ft) depending on thread size and engine material. Aluminium heads require lower torque than cast iron. Always consult the manufacturer spec — over-tightening can crack the porcelain or strip the thread.

Popular Nm values

Jump straight to a pre-computed answer with formula, extras, and a reference table.

Small fasteners
interior / electronics
4 Nm6 Nm10 Nm15 Nm
Engine bolts
head / manifold
40 Nm60 Nm90 Nm120 Nm
Engine torque (N/A)
street engines
150 Nm200 Nm300 Nm400 Nm
Performance / diesel
turbocharged / V8
500 Nm600 Nm800 Nm1000 Nm
All 500 values
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