How do I make a value stream map?

Describe your process in the box above: the steps, cycle times, changeover times, inventory between steps, and how orders reach production. The tool draws a value stream map with process boxes, data boxes, inventory triangles, push or pull arrows, and a timeline. Check the numbers against your own data before using it.

What are the standard value stream map symbols?

The main ones are the process box with a data box, the customer and supplier factory icon, the inventory triangle, the striped push arrow, the supermarket, the withdrawal kanban, the FIFO lane, manual and electronic information flow arrows, the kaizen burst, and the timeline ladder. The symbol table on this page explains each one.

What goes in a VSM data box?

Typically cycle time (C/T), changeover time (C/O), uptime, number of operators, available working time, and yield or scrap rate. Service processes often use process time, wait time, percent complete and accurate, and number of people instead.

How do you calculate lead time on a value stream map?

Convert each inventory quantity to days of demand (quantity divided by daily customer demand), add any wait time, and add the processing time of each step. The sum is the production lead time. Divide the total value-added time by the lead time to get process cycle efficiency.

Can AI make an accurate value stream map?

It can draw the layout and the symbols quickly, which is useful for drafts, workshops, and teaching. AI images can still misplace a number or mix up a symbol, so check every data box and timeline total yourself, and redraw the final version in your own standard if the map goes into a formal report.

Is there a free value stream map template?

The sample prompts on this page work as templates for common cases: push production, kanban and supermarket, future state, continuous flow cells, and service processes. You can try the generator and download results after signing in with free credits.

What is the difference between a VSM and a flowchart?

A flowchart shows steps and decisions. A value stream map also shows inventory, information flow, and time data, so you can see where the lead time goes. It works at the level of process areas, not individual tasks.

Lean Tool

Value Stream Map Maker for Lean & Process Improvement

Describe your process, cycle times, and inventory and get a value stream map with process boxes, data boxes, inventory triangles, push or pull arrows, and a lead-time timeline. Review the numbers, then download a PNG.

Process boxes, data boxes, inventory trianglesPush, pull, kanban, and FIFO symbolsTimeline with lead time and value-added timeDownload as PNG

AI Value Stream Map Maker

Describe your process

Free to try ·

Preview

Your value stream map will appear here

Include the numbers you want shown, then check them in the result

What is a value stream map?

A value stream map (VSM) is a lean tool that draws every step material and information take from supplier to customer, then adds the time data: how long each step works on the product and how long the product waits between steps. The result is one page that shows where the lead time actually goes. In most factories, waiting is the overwhelming share, and the map makes that visible.

Use it for lean projects, kaizen events, and Six Sigma analysis, and for office and healthcare processes through the service variant. If you only need to agree on scope, start with a SIPOC diagram.

Check the numbers. The generator draws the symbols and layout from your description. AI images can misplace a value or mix up a symbol, so verify every data box, inventory count, and timeline total against your own measurements before sharing the map.

Value stream map symbols and what they mean

These are the symbols most VSMs use, following the conventions from Learning to See. The icons below are exact drawings; the generator follows the same set.

Name	What it means	Drawing tip
Process box with data box	One area of continuous flow. The box under it holds the data: C/T (cycle time), C/O (changeover time), uptime, number of operators, available time, and yield.	Draw one box per area of flow, not one per task.
Customer / supplier	The outside source of material (left) and destination of product (right). Customer demand per day goes in or under it.	Put the customer on the right and the supplier on the left.
Inventory triangle	Stock waiting between steps, with the quantity and the time it covers underneath.	Write quantity and days of demand, for example 1,200 pcs (2 days).
Push arrow	Material moved to the next step on a schedule, not because the next step asked for it.	Each striped arrow is a place to ask if a pull system could replace it.
Supermarket	A controlled stock that a downstream step pulls from. The upstream step refills only what was taken.	Add the maximum quantity and the pull signal next to it.
Withdrawal kanban	The card or signal that tells the upstream step what to replace. A dashed line shows the loop.	Show production kanban separately if the upstream step also uses one.
FIFO lane	A first-in, first-out lane with a maximum quantity that links two processes without a full supermarket.	Write the maximum, for example "FIFO max 100".
Information flow	A straight arrow is manual information such as a schedule or report. A zigzag arrow is electronic information such as EDI or MRP.	Label every arrow: weekly forecast, daily orders, daily schedule.
Kaizen burst	A starburst marking an improvement to make at that point. Draw it on the current state, then carry the changes into the future-state map.	Name the improvement, for example "Reduce changeover".
Operator	A person at a process. It shows how many people the step needs and where workload can be balanced.	Match it to the "operators" line in the data box.
Timeline ladder	Upper steps are waiting time (inventory days) and lower steps are processing time. The two sums give lead time and value-added time.	Keep the units consistent: days on the top, seconds on the bottom.

How to make a value stream map, step by step

1
Choose one product family and the customer demand
Pick the products that share most of their processing steps. Write the customer demand per day and compute takt time: available working seconds divided by daily demand. With 25,200 working seconds and 420 units a day, takt time is 60 seconds.
2
Walk the flow from shipping back to the first step
Start at the customer and walk upstream. Every step you see on the floor becomes a process box. Collect the numbers yourself instead of copying them from the routing sheet.
3
Fill in a data box for each process
Record cycle time (C/T), changeover time (C/O), uptime, operators, and available time. These five lines are enough for a first map.
4
Count the inventory between steps
Count what is physically waiting and convert it to days of demand: quantity divided by daily demand. 1,200 pieces at 600 a day is 2 days.
5
Add information flow and production control
Show how the customer order reaches the plant, how the schedule reaches each step, and what is pulled and what is pushed. Label every arrow with its frequency.
6
Draw the timeline and calculate
Add up the inventory days for lead time and the cycle times for value-added time. The ratio of the two, often well under 5 percent, shows how much of the lead time is waiting.
7
Mark improvements and draw the future state
Use kaizen bursts on the current state where the data points to waste, then redraw the map with flow, supermarkets, and a single pacemaker process.

Current-state value stream map of a push production line with inventory triangles, data boxes, and a timeline — Generated from the first sample prompt above. The timeline adds the inventory days (2 + 4 + 3 + 1 = 10 days) and the processing times (30 + 45 + 60 + 20 = 155 seconds).

Value stream map calculations

Five formulas cover most of the numbers on a current-state map. The examples use the push-production map above.

Metric	Formula	Example
Takt time	Available working time per day / customer demand per day	25,200 s / 420 units = 60 s per unit
Inventory days	Inventory quantity / customer demand per day	1,200 pcs / 600 pcs per day = 2.0 days
Production lead time	Sum of inventory days (and any wait time) plus processing time	2.0 + 4.0 + 3.0 + 1.0 days, plus 155 s of processing = about 10 days
Value-added time	Sum of the cycle times of the value-adding steps	30 + 45 + 60 + 20 = 155 s
Process cycle efficiency	Value-added time / lead time	155 s / (10 days x 25,200 s of working time) = about 0.06 percent

Example values are illustrative, for a 7-hour working day. Use the working time and demand from your own plant.

Common value stream mapping mistakes

Mapping every task instead of every area of flow. A VSM is not a flowchart; one process box covers a group of steps that run together.
Using standard times from the routing instead of measured ones. Walk the floor and time it.
Mapping several product families on one page. Pick one family and map the others later.
Skipping information flow. The scheduling system is often the biggest source of inventory.
Counting inventory in pieces only. Convert it to days of demand so the timeline adds up.
Drawing the future state before the current state has real numbers.

VSM vs SIPOC vs process flow diagram vs swimlane

Diagram	What it shows	Best for
Value stream map	Material and information flow with cycle times, inventory, and wait times	Lean waste analysis and lead-time reduction
SIPOC diagram	Suppliers, inputs, 4 to 7 steps, outputs, and customers on one page	Scoping a project before detailed mapping
Process flow diagram	Major equipment and material streams, often with a stream table	Chemical and process plant design
Swimlane diagram	Steps and decisions split by role or department	Finding handoff delays and ownership gaps

For a chemical or plant process with equipment and streams, use the process flow diagram generator. To split the same steps by role, use the swimlane diagram generator. After the map shows where the delay is, a fishbone diagram and a Pareto chart help you find and rank the causes.

Value Stream Map Examples

Generated with this tool from the prompts shown. Always check the numbers before you reuse a map.

View:

Current State: Push Production

Four steps pushed through inventory. The timeline separates 10 days of waiting from 155 seconds of processing.

current statepushmanufacturing

Current State with Supermarket and Kanban

Production control, forecasts, a finished-goods supermarket, and a withdrawal kanban in one current-state map.

current statekanbansupermarket

Future State: Pull and FIFO

A future state with a supermarket pull loop, a FIFO lane, and a kaizen burst on the changeover.

future statepullFIFO

Continuous Flow Cell

Three steps grouped as one cell with a single data box, so there is no inventory between them.

continuous flowcell

Service Process: Order to Cash

An office process: queues of orders and invoices, %C&A in the data boxes, and 6.5 days of wait against 28 minutes of work.

serviceofficeorder to cash

What is a value stream map template?

A value stream map template is a starting layout with the standard symbols already placed: customer and supplier at the top corners, production control in the middle, a row of process boxes with data boxes, inventory triangles between them, and a timeline ladder at the bottom. In this tool, the sample prompts above work as templates: pick one, replace the step names and numbers with yours, and generate. If you work from a printed or slide template instead, the symbol table on this page is the checklist for filling it in.

Current state vs future state map

The current-state map shows how material and information flow today, with the real inventory, cycle times, and push arrows. The future-state map redraws it with improvements applied: connected flow, supermarkets and pull signals, and a single scheduling point. Teams usually draw the current state first, mark kaizen bursts on it, then generate a future state to agree on the target and the order of improvements.

Manufacturing vs service VSM

Manufacturing maps count pieces and use cycle time and changeover time. Service and office maps count requests, orders, or patients, and usually replace the data box with process time (P/T), wait time (WT), percent complete and accurate (%C&A), and number of people. The timeline works the same way: waiting time on top, processing time below, and a ratio of value-added time to lead time at the end.

Where the maps come from

Value stream mapping grew out of the Toyota "material and information flow" diagrams and was popularized by the 1998 workbook Learning to See by Mike Rother and John Shook (Lean Enterprise Institute), which is the usual source of the symbols used here. Some companies add their own symbols or use slightly different data boxes, so follow your own standard where one exists.