How many N·m is 400 lb·ft?

400 lb·ft ≈ 542 N·m. That is a typical street-V8 peak, not a fastener spec.

Is this a transmission torque converter calculator?

No. This converts torque units (lb·ft ↔ N·m). It does not size a stall converter or calculate flash RPM.

How do I convert lb·in to lb·ft?

Divide by 12. 120 lb·in = 10 lb·ft ≈ 13.6 N·m. Small fasteners are usually inch-pounds.

Kilogram-force meters, common in older Japanese manuals. 1 kgf·m ≈ 9.81 N·m ≈ 7.23 lb·ft.

Torque Unit Converter

Convert lb·ft, N·m, lb·in, and kgf·m for dyno sheets and torque wrenches.

Power Pressure Displacement Torque units Length Weight Volume Speed Temperature

Full torque board

Same input, every torque unit — tap a tile to set the right-hand unit.

Pound-feet to newton-meters

1 lb·ft ≈ 1.356 N·m. A 400 lb·ft street V8 is about 542 N·m.
Torque wrenches and OEM tables mix lb·ft, N·m, and the occasional kgf·m (older Japanese books).
This page converts units. It does not calculate torque from horsepower — that needs RPM.

“Torque converter” in search often means the transmission part. This page is the unit tool: pound-feet to newton-meters for a dyno sheet or a head-bolt spec. If you need torque from an HP number, use the torque calculator instead.

US wrenches and many crate tags still print lb·ft. European manuals and most aftermarket cams use N·m. Inch-pounds show up on small fasteners (intake bolts, electronics). kgf·m still appears in older Toyota and Nissan procedures.

Convert the spec, then follow the OEM sequence — angle-torque steps and lubricant notes do not survive a unit swap. 65 lb·ft is 88 N·m, not “about 90.”

Common torque conversions

Bench pairs for wrenches and peak engine torque. Enter the exact spec above.

lb·ft and N·m
You have	Equals	Also
65 lb·ft	88 N·m	780 lb·in
400 lb·ft	542 N·m	55.3 kgf·m
100 N·m	73.8 lb·ft	885 lb·in
12 lb·in	1.36 N·m	0.14 kgf·m
30 kgf·m	294 N·m	217 lb·ft

1 lb·ft ≈ 1.3558 N·m. 1 kgf·m = 9.80665 N·m. 1 lb·ft = 12 lb·in.

When this is the wrong tool

Horsepower to torque needs RPM (torque calculator). A transmission torque converter stall speed is not a unit. Fastener procedures with angle steps stay in the OEM table after you convert the starting N·m.

How to convert lb·ft to N·m

Enter the printed torque. Wrench click, dyno peak, or service-manual line.
Pick lb·ft, N·m, lb·in, or kgf·m. Match the paper. Inch-pounds are 12× smaller than pound-feet.
Read the wrench unit you own. Tap a board tile to put that unit on the right-hand card.