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Open toolNumber Line Generator
Enter your start value, end value, step interval, and highlighted points to generate a labeled number line with tick coordinates, ASCII diagram, and embeddable SVG code.
Free to useNo sign-upRuns in your browser
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Enter the inputs, then select Generate Number Line.
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Result will appear here
How the Number Line Generator Works
The calculator computes evenly spaced tick coordinates between your minimum and maximum bounds, maps highlighted points to normalized `[0, 100%]` axis positions, and renders both an ASCII ruler and vector SVG markup.
x_i = Start + i * Step (0 <= i <= floor((End - Start) / Step)); SVG_x = 50 + ((x - Start) / (End - Start)) * 700.
Requires End > Start, Step > 0, and total ticks <= 101.
Common Classroom & Math Number Line Configurations
Standard start, end, and step settings for integer arithmetic, fractions, and coordinate geometry.
| Number Line Type | Start / End Range | Step Interval | Total Major Ticks & Use Case |
|---|---|---|---|
| Primary Counting Line | 0 to 20 | 1 or 2 | 21 or 11 ticks; addition and subtraction jumps. |
| Signed Integer Line | -10 to 10 | 1 or 2 | 21 or 11 ticks; negative number operations and absolute value. |
| Decimal / Quarters Line | 0 to 2 | 0.25 | 9 ticks (0, 0.25, 0.5 ... 2.0); fraction-to-decimal equivalence. |
| Percentage / Probability Scale | 0 to 100 | 10 | 11 ticks; percentiles, probability, and test score scaling. |
How to Create a Custom Number Line
Set up your axis bounds and highlighted markers in three steps.
Set Start and End coordinate bounds
Enter the minimum (left) and maximum (right) values for your axis.
Choose your Tick step interval
Specify the increment between ticks (integers like 1, 2, 5 or decimals like 0.25, 0.5).
Add optional plotted points and generate
List any points to highlight and click Generate Number Line to copy the ASCII ruler or SVG code.
Worked Number Line Examples
Examples for integer algebra and decimal measurement.
Signed integer line (-10 to 10, step 2) with plotted points (-6, 0, 4)
Generates 11 evenly spaced ticks (-10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10) and places markers at 20%, 50%, and 70% along the axis.
Unit interval decimal line (0 to 1, step 0.1)
Produces 11 tenth-interval ticks (0.0 through 1.0) for probability and decimal placement worksheets.
Blank worksheet template (-5 to 5, step 1)
Omit plotted points to generate an unmarked coordinate axis ready for student exercises.
Using the ASCII Diagram and SVG Code
Copy the plain-text scale into code comments or paste the `<svg>` block into HTML/Markdown.
The ASCII number line uses fixed-width character spacing so ticks and labels align in any monospace editor.
The generated `<svg>` element includes arrowheads, major tick lines, numeric labels, and colored circle markers for each plotted point.
Axis Range & Step Validation
Ensure your step size divides your span cleanly.
End value must be strictly greater than Start value, and Step interval must produce between 2 and 101 ticks.
Plotted points outside `[Start, End]` are flagged as out-of-bounds.
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Open toolFrequently Asked Questions About Number Lines
Answers about using Number Line Generator and understanding its results.
How do I generate a number line with negative and positive integers?
Set Start value to a negative number (such as -10), End value to a positive number (such as 10), and Tick step interval to 1 or 2. The generator centers 0 proportionally and marks every integer tick.
Can I create decimal or fractional step number lines?
Yes. Enter decimal steps such as 0.25, 0.5, or 0.1 (for example, Start = 0, End = 2, Step = 0.25) to generate a 9-tick decimal number line.
How do I plot specific points or inequalities on the number line?
Enter comma-separated numbers in the 'Plotted points to highlight' field (such as '-6, 0, 4'). The generator places `[●]` pin markers above those coordinates and outputs their exact normalized percentage positions.
Can I embed the generated SVG number line in worksheets or HTML?
Yes. The detail panel outputs both a clean monospace ASCII number line for plain-text notes and a self-contained `<svg viewBox="0 0 800 140">` snippet ready for HTML or Markdown documents.
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