Calculator directory
Each calculator uses the same conduit dimensions, cable library, and fill mathematics, but starts with a different design question.
Which optical design or fiber pathway calculation do I need?
Review the dedicated development sequence for link budget, optical power, splitter, distance, PON, OTDR, fiber-count, and service-loop workflows.
What conductor size coordinates ampacity and voltage drop?
Enter the circuit, load, installation conditions, length, and confirmed protective device to coordinate conductor and wire-type grounding sizes.
Will this cable load fit in the conduit I selected?
Choose one or more conduits, add mixed cable types and quantities, and verify the calculated fill against the selected criterion.
What conduit sizes are required for this cable load?
Start with the cables. The calculator recommends the smallest single conduit or a minimum-count multi-conduit plan.
How many of this cable fit in a selected conduit?
Select one conduit and one manufacturer cable product—or enter a custom diameter—to calculate identical-cable capacity.
What minimum pull-box dimension does this conduit layout require?
Choose a straight, angle, or U pull and enter the conduit trade sizes that govern one pull direction.
Does this outlet, device, or junction box have enough usable volume?
Apply the six 2023 NEC 314.16(B) allowance categories to conductors from 18 AWG through 6 AWG and compare them with a confirmed box volume.
How much voltage will be available at the load?
Model DC, single-phase, or balanced three-phase voltage drop for copper or aluminum conductors and a one-way circuit length.
What ampacity remains after the applicable conditions of use?
Apply ambient-temperature correction, current-carrying-conductor adjustment, terminal-temperature limits, and continuous-load treatment to a 2023 NEC Table 310.16 value.
What wire-type equipment grounding conductor is required?
Start with the overcurrent device and compare the minimum and installed phase conductors to apply proportional circular-mil adjustment.
What tray width is needed for this cable load?
Add cable groups and compare occupied area or single-layer width with generic or manufacturer tray dimensions.
Could identical cables wedge during this conduit pull?
Select a conduit and one manufacturer cable product—or enter a custom diameter—to classify the published jamming-risk range.
What bend spacing and rotation does this conduit offset require?
Enter a standard offset rise or a rolling offset rise and roll, then select the bend angle to calculate ideal centerline geometry.
Where do I mark a three-point saddle?
Enter obstruction height and center distance for published 45°/22.5° or 60°/30° saddle marks.
How do I clear a wider obstruction?
Plan two equal offsets with a level section sized to the entered obstruction width.
Where is the arrow mark for a 90° stub?
Subtract verified or custom bender take-up from the desired finished stub height.
Quick choice
Known branch-circuit load and length: use Branch Circuit Wire Size to coordinate ampacity, voltage drop, a confirmed protective device, grounding, and conduit handoff.
Known conduit: use Conduit Fill to verify a complete load, or Conduit Cable Capacity for one repeated cable type.
Known cable load: use Conduit Size to determine the raceway sizes and quantities required.
Known conduit layout: use Pull Box Size to calculate the governing enclosure dimension for each pull direction.
Known outlet, device, or junction-box contents: use Electrical Box Fill to compare all applicable 2023 NEC 314.16(B) allowances with the confirmed usable box volume.
Known source and load: use Voltage Drop to estimate load voltage and compare conductor sizes for a selected drop target.
Known conductor and installation conditions: use Wire Ampacity to apply ambient, conductor-count, terminal, and continuous-load limitations.
Known overcurrent device and final phase conductor: use Equipment Grounding Conductor to size a wire-type EGC and transfer both conductor rows to conduit fill.
Known cable tray load: use Cable Tray Fill to compare cable area or single-layer width with available trays.
Known identical-cable pull: use Conduit Jam Ratio to screen for cable-wedging risk before completing the pulling analysis.
Known conduit offset: use Conduit Offset and Rolling Offset to calculate standard or rolling-offset geometry and ideal travel between equal bends.
Known obstruction: use 3-Point Saddle Bend for a narrow crossing or 4-Point Saddle Bend for a wider obstruction.
Known finished stub height: use 90° Conduit Stub-Up with the take-up printed on the bender.