Pitch

Pitch is one of those lean concepts that sounds dry but turns out to be one of the most useful planning tools in a leveled production system. It is the bridge between takt time, which is per-unit demand pace, and the physical reality of moving work between stages in containers, trays, or pallets. Pitch is the rhythm at which the pacemaker releases finished work to the next part of the value stream, and the basic time unit of every heijunka box.

"Takt is per part. Pitch is per container. One is what the line produces. The other is when it leaves."

How pitch works

The formula: pitch equals takt time multiplied by pack-out quantity. Takt is the demand-driven pace per unit; pack-out is the number of units that fit in one container, tray, box, or pallet handed off to the next stage. Multiply them together and you get the time it takes to fill one container at the demand pace.

A simple example. If demand calls for one unit every two minutes (a takt of two minutes per unit), and the line packages finished units in trays of 10, then pitch is 20 minutes. Every 20 minutes, one finished tray leaves the line. The line is producing at takt internally, but downstream stages experience the line's output as one tray every 20 minutes. That 20-minute interval is the rhythm at which the supermarket downstream gets a new arrival, the rhythm at which packaging receives a new batch, and the rhythm at which shipping sees a new lot ready to ship.

Pitch becomes the unit of time inside the heijunka box. Each slot in the box represents one pitch interval. Cards in each slot tell the line what to build during that interval. Operators pull the next card, the line produces one container's worth, and the next card comes up. The box visualizes a few hours or a shift in advance, so the team can see exactly when each variant will run.

Sizing pitch correctly means making sure pack-out fits how work actually moves. If shipping expects trays of 12 but pitch was calculated against trays of 10, the rhythm misaligns. Pitch has to be tied to a real container size that the downstream process uses. Changing pack-out (because shipping switched to a larger tray, or because a customer changed their packaging requirement) means recalculating pitch.

Where pitch fits on the shop floor

Picture a small electronics assembly shop building sensor modules. Customer demand averages 240 modules per shift across two SKUs. Available shift time after breaks and meetings is 420 minutes. Takt time is 420 divided by 240, or about 1.75 minutes per module. The shop ships in trays of 24 modules. Pitch is 24 times 1.75, or 42 minutes.

The pacemaker cell has a heijunka box with 10 slots, each representing a 42-minute pitch. The shift covers all 10 slots, with cards interleaved by SKU according to the demand mix. Operators run the cell to fill one tray every 42 minutes. The mizusumashi route runs in 42-minute loops, picking up the full tray at the cell and delivering it to the packing supermarket. Packaging runs the next stage on the same rhythm, releasing palletized boxes every several pitches.

Everything in the value stream beats at multiples of pitch. Material deliveries arrive every two pitches. Finished-goods supermarket replenishment happens every pitch. The shipping cutoff is at the end of every fourth pitch. The shop runs on a steady, visible rhythm that everyone can read at a glance. There is no whiteboard. The rhythm is the schedule.

Common mistakes with pitch

• Calculating without pack-out. Pitch has to align to how units physically move between stages. Skipping pack-out in the math breaks the rhythm.
• Changing pack-out without recalculating pitch. A new tray size or pallet size means the pitch interval changes. The heijunka box has to be reslotted.
• Treating pitch as a per-unit deadline. Pitch is the average release interval, not a strict per-unit clock. Operators do not need to finish every unit within pitch; the average per tray has to land on time.
• Setting pitch shorter than realistic handoff capacity. If downstream cannot receive a tray every 20 minutes, pitch is too aggressive. Match it to the slowest receiving process if necessary.
• Forgetting to recheck pitch as takt changes. Demand shifts change takt, which changes pitch. A pitch set six months ago may be wrong now.

Pitch and related Lean tools

Pitch is derived from takt time and pack-out quantity, and it is the time unit inside heijunka boxes that sequence work at the pacemaker process. The slots in the heijunka box are pitch intervals, with one card per slot telling the line what to build. Pitch also sets the loop interval for material handlers running mizusumashi routes, with deliveries timed to one or two pitches.