Length of a Spiral

The length of a spiral can be calculated as

L = 3.14 n (D + d) / 2                  (1)

where

L = length of spiral (m, ft ...)

n = number of rings

D = spiral outside diameter (m, ft ...)

d = spiral inside diameter or opening (m, ft ...)

The equation can be used to calculate the length of a material of uniform thickness like a belt in a roll. 

Spiral Length Calculator

n - number of rings

D - outside diameter (m, ft ..)

d - inside diameter )m, ft ..)

Load Calculator!

Share

Search Engineering ToolBox

• the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

About Engineering ToolBox!

• Contact - Citation - Copyrights - Advertising - Warranty and Liability

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Advertise in the ToolBox

If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. You can target the Engineering ToolBox by using AdWords Managed Placements.

• Home
  • Acoustics
  • Air Psychrometrics
  • Basics
  • Combustion
  • Drawing Tools
    • 2D Schematic Drawings
  • Dynamics
  • Economics
  • Electrical
  • Environment
  • Fluid Mechanics
  • Gases and Compressed Air
  • HVAC Systems
    • Air Conditioning
    • Heating
    • Noise and Attenuation
    • Ventilation
  • Hydraulics and Pneumatics
  • Insulation
  • Material Properties
    • Boiling Points
    • Densities
    • Melting and Freezing Points
    • Viscosities
  • Mathematics
  • Mechanics
    • Fasteners
    • Threads
  • Miscellaneous
  • Physiology
  • Piping Systems
    • Codes and Standards
    • Corrosion
    • Design Strategies
    • Dimensions
    • Fluid Flow and Pressure Loss
    • Heat Loss and Insulation
    • Pressure Ratings
    • Temperature Expansion
    • Valve Standards
  • Process Control
    • Control Valves
    • Documentation
    • Measurements & Instrumentation
      • Flow Measurement
      • Temperature Measurement
    • Risk, Reliability and Safety
  • Pumps
  • Sanitary Drainage Systems
  • Standard Organizations
  • Statics
    • Beams and Columns
  • Steam and Condensate
    • Control Valves and Equipment
    • Flash Steam
    • Heat Loss and Insulation
    • Pipe Sizing
    • Thermodynamics
  • Thermodynamics
  • Water Systems

Temperature

^oC
^oF

Load Calculator!

Length

m
km
in
ft
yards
miles
naut miles

Load Calculator!

Area

m²
km²
in²
ft²
miles²
acres

Load Calculator!

Volume

m³
liters
in³
ft³
us gal

Load Calculator!

Weight

kg_f
N
lb_f

Load Calculator!

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Load Calculator!

Pressure

Pa (N/m²)
bar
mm H₂O
kg/cm²
psi
inches H₂O

Load Calculator!

Flow

m³/s
m³/h
US gpm
cfm

Load Calculator!