Number Sequence Generator

Number sequence generator for step lists, ranges, and copy-paste series

This Number Sequence Generator creates an arithmetic sequence, which is a list of numbers that increases or decreases by the same amount each step. It is built for a simple, common task: you need a clean list like 1, 2, 3, 4, 5 or 0, 5, 10, 15, 20 and you want to copy it into a spreadsheet, a label template, a checklist, or a quick calculation workflow.

The calculator is intentionally focused on one job: generating evenly spaced numbers from a start value with a fixed step size. It does not try to generate special sequences like Fibonacci, prime numbers, or random values. If your goal is a predictable list you can reuse, this is the right tool.

To use it, enter a start value and a step size. Then choose how the generator should stop. If you enter an end value, the generator will keep stepping until it reaches the end (or the last value before passing it). If you do not enter an end value, it will generate a fixed number of terms (the count). You can also enter both, but the end value acts as the stop rule, and the count becomes a safety limit to prevent extremely large outputs.

Assumptions and how to use this calculator

• Start value and step size are required. Step size cannot be 0 because a sequence would never progress.
• Count is optional. If you do not provide an end value, the calculator uses the count to decide how many numbers to generate.
• End value is optional. If provided, the generator stops when the next step would pass the end (based on step direction).
• Negative step sizes are allowed. A negative step generates a descending sequence (for example, 10, 8, 6, 4, 2).
• Very large sequences are limited to keep the page responsive. If your settings would generate too many numbers, reduce the count or tighten the end range.

Common questions

What kind of sequence does this generate?

It generates an arithmetic sequence only. That means every number is the previous number plus the same step size. This is the standard sequence used for ranges, intervals, counting lists, and evenly spaced series.

Do I need to enter both an end value and a count?

No. Enter a count if you want “N numbers starting from here.” Enter an end value if you want “go until you reach this target.” If you enter neither, the tool cannot know when to stop, so it will ask you to supply at least one stopping rule.

Why does my end value not appear in the list?

The end value only appears if it lands exactly on a step. For example, start 0, step 6, end 20 will produce 0, 6, 12, 18 because the next value (24) would pass 20. If you need the end value included, adjust the step size so the end is reachable.

Can I generate a descending sequence?

Yes. Use a negative step size, and make sure your end value (if used) is lower than the start value. For example, start 100, step -5, end 75 produces 100, 95, 90, 85, 80, 75.

How can I make the result more usable in Excel or Google Sheets?

Use the comma-separated list for pasting into a single row, or use the line-separated list for pasting into a single column. If you are building IDs, labels, or templates, the line-separated format is usually the cleanest.