What a flowchart is and why you might need one
A flowchart is a diagram that shows the steps in a process from start to finish, using boxes and arrows to show which step comes next. Each box holds one decision or action, and the arrows point to what happens after. Flowcharts work because they turn something you have to explain in words into something someone can follow by looking at a picture.
You might create a flowchart to show how a process works — like what happens when you submit a rental process, or the steps to troubleshoot why your internet is down. You might also use one to plan a process you are building, like the steps a customer goes through when they sign up for a service. The point is the same: a flowchart makes the order and the choices visible.
Key Takeaways
- A flowchart uses rectangles for steps, diamonds for decisions, and arrows to show the direction the process moves.
- Start by writing out every step and decision in the process in order, then draw the shapes and connect them with arrows.
- You can draw a flowchart by hand on paper, or use free tools like Google Drawings, Lucidchart, or Draw.io that work in your web browser.
- The clearest flowcharts have one start point, one end point, and labels on every arrow so the reader knows why the process branches.
The shapes and symbols that make a flowchart readable
Flowcharts use a small set of standard shapes so that anyone looking at one knows what each part means. A rectangle holds a step or action — something that happens. A diamond holds a decision — a yes-or-no question that splits the process into two paths. An oval marks the start or end of the process. Arrows connect the shapes and show which direction the process moves.
You do not have to use these shapes, but using them means someone who has never seen your flowchart before will understand it without explanation. If you use a rectangle to mean a decision and a diamond to mean an action, you have made your flowchart harder to read, not easier. Stick to the standard shapes and your flowchart will be clearer.
Label every arrow, especially the ones leaving a diamond. If a diamond asks "Is the rent overdue?", the arrow leaving to the right should say "Yes" and the arrow leaving downward should say "No". Without those labels, the reader has to guess which path to follow.
How to plan your flowchart before you draw it
Before you open a drawing tool, write down every step in the process in order. Do not try to draw and plan at the same time — you will end up redrawing. Write the steps as a list, then read through it and mark where decisions happen. A decision is any point where the process could go two different ways depending on the answer to a question.
For example, if you are mapping out how to troubleshoot a computer that will not turn on, your list might look like: Check if the power cable is plugged in. If yes, press the power button. If no, plug it in and press the power button. Wait 30 seconds. Does the computer turn on? If yes, you are done. If no, check if the monitor is on. And so on. Once you have the list, you can see exactly where the diamonds (decisions) go and where the rectangles (steps) go.
This step saves time because you will not have to redraw the whole thing when you realize you forgot a step or put them in the wrong order. A messy list on paper is faster to fix than a messy diagram.
Drawing your flowchart by hand or on a computer
You can draw a flowchart on paper with a pen and a ruler, and that is perfectly fine if you are the only person who will see it. Use a ruler to draw straight lines and boxes so it is easier to read. If you need to share it or print it, a computer tool works better because you can move things around without erasing.
Free tools that work in your web browser include Google Drawings (part of Google Drive), Draw.io, and Lucidchart. Google Drawings is the simplest if you already use Google Drive. Draw.io and Lucidchart have more flowchart shapes built in, which saves time. All three let you save your work and share a link with someone else.
To start in Google Drawings: open Google Drive, click "Create" and choose "Drawing". Look for the shapes menu on the left side. Click the rectangle tool and drag to draw a box. Type inside the box. Then draw arrows by clicking the line tool and dragging from one shape to another. Label the arrows by double-clicking on them and typing.
Making your flowchart straightforward to follow
The clearest flowcharts flow from top to bottom or left to right, not in circles or zigzags. If your reader has to trace the arrows backward or jump around the page, they will get lost. Start at the top with an oval that says "Start", then move down. When a decision branches the process into two paths, put the "Yes" path on one side and the "No" path on the other, then bring them back together below.
Keep the text in each box short — one sentence or less. If you need to explain something, the flowchart is not the place. A flowchart shows the order and the decisions; a separate document can explain what each step actually means. Do not cram details into the boxes.
Use the same size and style for all your boxes so the flowchart looks organized. If one box is huge and another is tiny, it looks like a mistake even if it is not. Make all the rectangles the same size, all the diamonds the same size, and all the text the same font. This takes five minutes and makes the whole thing look professional.
Common mistakes that make flowcharts confusing
The most common mistake is having too many decision points or paths. If your flowchart has more than five or six diamonds, it is probably trying to show too much at once. Break it into smaller flowcharts instead — one for the main process and separate ones for what happens in each branch. A flowchart that covers two pages is harder to understand than two flowcharts that each fit on one page.
Another mistake is forgetting to label the arrows leaving a diamond. If you do not write "Yes" and "No" on the arrows, the reader will not know which path to follow. This is the single most common reason someone looks at a flowchart and says "I do not understand this".
A third mistake is using unclear language in the boxes. "Check the thing" is not as useful as "Check if the power cable is plugged in". The more specific you are, the more useful the flowchart becomes. Someone should be able to follow your flowchart without asking you what you meant.
Frequently Asked Questions
Can I make a flowchart in Microsoft Word or Excel?
Yes. In Word, go to Insert, then Shapes, and you will find rectangles, diamonds, and lines. In Excel, the Shapes menu is in the same place. Both work, but they are slower than tools built for flowcharts because you have to draw and position each shape by hand. Google Drawings, Draw.io, and Lucidchart are faster because the shapes snap into place and align automatically.
What if my process has more than two choices at one decision point?
Use a diamond with three or four arrows leaving it instead of two. Label each arrow with the choice it represents — "Yes", "No", "Maybe", "Call the landlord", whatever applies. This works, but if you have more than three choices, consider breaking the decision into multiple yes-or-no questions instead. A flowchart with many branches from one diamond gets hard to follow quickly.
Should I use colors in my flowchart?
Colors can help organize a flowchart if you use them consistently — for example, all decision diamonds in one color and all action rectangles in another. But colors are not necessary. A black-and-white flowchart with clear labels is just as readable. If you do use colors, use only two or three so the flowchart does not look chaotic.
How do I share a flowchart I made in Draw.io or Google Drawings?
Both tools let you share a link. In Google Drawings, click "Share" in the top right and choose who can view it. In Draw.io, click File, then Export, and you can read it as an image or PDF to email to someone. You can also take a screenshot of your flowchart and paste it into a document if you just need a static image.