How do I select the right roller chain pitch?

Multiply the transmitted power by the service factor to get design power. Look up the chain pitch in power rating tables based on the small sprocket speed. Common pitches: 08B (12.7mm) for light duty, 10B (15.875mm) for medium, 12B-16B for heavy loads.

What service factors apply to chain drives?

Service factors: 1.0 for uniform load/smooth start, 1.3 for moderate shock, 1.5 for heavy shock, 1.7 for frequent starts/reversing. Multiply by 1.25 for 16+ hours/day operation.

How do I calculate chain length in links?

Chain length L = 2C/p + (z1+z2)/2 + [(z2-z1)/(2π)]²×p/C, where C is center distance, p is pitch, z1 and z2 are sprocket teeth. Round to the nearest even number of links.

What is the maximum chain speed?

Maximum chain speed depends on chain quality and lubrication. Typical limits: 08B up to 12 m/s, 10B up to 15 m/s, 12B up to 18 m/s. Higher speeds require oil bath or pressure lubrication.

What is the minimum number of teeth for a sprocket?

Minimum recommended: 17 teeth for smooth operation, 21 teeth for high speed. Fewer teeth cause increased wear, noise, and chordal action. Standard minimum is 9 teeth but not recommended for power transmission.

Free Engineering Tool #091

Chain Drive Calculator

Select roller chain pitch from power rating tables. Enter power, driver/driven speed, and service factor. Calculates chain speed, sprocket sizes, and chain length.

ISO 606 chain sizesRoller Chain08B–24B

Results

Recommended Chain

—

Design Power

—

Chain Speed

—

Speed Ratio

—

Chain Length

—

Output Speed

—

Design Power

Chain Length in Links

Chain Power Rating Table (single strand, 19T sprocket — typical manufacturer catalogue values)

Chain	Pitch	@500 RPM	@1000 RPM	@1500 RPM
06B-1	9.525 mm	1.1 kW	1.8 kW	2.3 kW
08B-1	12.70 mm	2.8 kW	4.7 kW	6.0 kW
10B-1	15.875 mm	5.3 kW	9.0 kW	11.5 kW
12B-1	19.05 mm	8.9 kW	15 kW	19 kW
16B-1	25.40 mm	19 kW	32 kW	38 kW
20B-1	31.75 mm	33 kW	52 kW	60 kW
24B-1	38.10 mm	55 kW	85 kW	95 kW

⚠️ Note: Power ratings, service factors and strand multipliers are engineering estimates based on manufacturer catalogue practice — ISO 606 specifies chain dimensions, tolerances and minimum breaking loads, not power ratings. Ratings are approximate and depend on lubrication type. For duplex chains, multiply by 1.7; for triplex by 2.5. Always verify against the selected chain manufacturer’s catalogue.