Rolling Offset Calculator
Calculate pipe offset travel distance, run length, and true offset for any fitting angle
Calculate Rolling Offset
Calculation Method
Pipe Offsets
Pipe Fitting
Rolling Offset Results
Formulas Used:
True Offset = √(h² + v²) = √(0.00² + 0.00²) = 0.000 inches
Travel = True Offset / sin(45°) = 0.000 / 0.7071 = 0.000 inches
Run = True Offset / tan(45°) = 0.000 / 1.0000 = 0.000 inches
Installation Tips
Example Calculation
45° Rolling Offset Example
Problem: Connect two pipe lines with offsets
Horizontal offset: 100 cm (39.37 inches)
Vertical offset: 50 cm (19.69 inches)
Fitting: 45° elbows (standard choice)
Solution Steps
1. True Offset = √(39.37² + 19.69²) = √(1550 + 388) = √1938 = 44.02 inches
2. Travel = 44.02 ÷ sin(45°) = 44.02 ÷ 0.7071 = 62.23 inches
3. Run = 44.02 ÷ tan(45°) = 44.02 ÷ 1.0000 = 44.02 inches
Result: Travel = 158.11 cm, Run = 111.80 cm
Offset Multipliers
Quick Reference
True Offset = √(h² + v²)
Travel = True Offset ÷ sin(angle)
Run = True Offset ÷ tan(angle)
45° fittings: Run = True Offset
90° fittings: Travel = True Offset
Account for fitting allowances
Understanding Rolling Offsets
What is a Rolling Offset?
A rolling offset occurs when connecting two pipes that are misaligned both horizontally and vertically. Unlike simple offsets that move in only one direction, rolling offsets require three-dimensional calculations to determine the proper fitting angles and pipe lengths.
Key Terms
- Roll (Horizontal Offset): Side-to-side displacement
- Set (Vertical Offset): Up-and-down displacement
- True Offset: Direct diagonal distance between points
- Travel: Actual pipe length needed for the offset
- Run: Horizontal distance along the pipe direction
Calculation Method
True Offset = √(h² + v²)
Travel = True Offset ÷ sin(θ)
Run = True Offset ÷ tan(θ)
Where θ = bend angle of the fitting
Common Applications
- • Plumbing installations in tight spaces
- • HVAC ductwork connections
- • Industrial piping systems
- • Electrical conduit routing
- • Gas line installations