Calculate a Running Product
Calculate a cumulative product of a list of numbers. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Calculate a Running Product
- 1. Paste your list of numbers. Enter the numbers to multiply in sequence, separated by commas or line breaks. Each entry is multiplied into the running total in the order it appears.
- 2. Set the separator. Pick the Separator used between values in the output, matching whatever delimiter your downstream tool, spreadsheet cell or script expects to parse.
- 3. Copy the running product. Copy the sequence of partial products from the output. Each position is the product of every number from the start of the list up to that point.
When to use Calculate a Running Product
Calculate a Running Product multiplies a list of numbers step by step and shows the partial product after each one, rather than just the final total. It helps whenever the intermediate values matter as much as the end result.
- Modeling compound growth. You have a series of yearly growth multipliers like 1.05, 1.03, 1.07 and want to see the compounded factor after each year, not just the total return after all of them.
- Checking combinatorics by hand. A probability problem multiplies successive event probabilities together, and you want to see how the combined probability shrinks after each additional event is included.
- Verifying a factorial-style calculation. A student learning permutations wants to see the running product 1, 1x2, 1x2x3 and so on to understand how a factorial builds up term by term.
- Auditing a pricing markup chain. A product passes through several markup multipliers from manufacturer to distributor to retailer, and you want the price after each stage of the chain, not just the shelf price.
Examples
Running product of integers
Input
1, 2, 3, 4, 5
Output
1, 2, 6, 24, 120
Decimals and negatives
Input
2 -0.5 8
Output
2, -1, -8
About the Calculate a Running Product tool
Calculate a Running Product is a free online tool that works entirely inside your web browser. Calculate a cumulative product of a list of numbers. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 194 Number utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with the Separator setting, and the result refreshes the moment you change it. 2 worked examples further down the page show exactly what the tool produces for real inputs.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Is Calculate a Running Product free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.
Related tools
All Number Tools →Calculate a Running Sum
Calculate a cumulative sum of a list of numbers.
Calculate a Running Difference
Calculate a cumulative difference of a list of numbers.
Calculate Number Product
Quickly multiply all the numbers together and find their product.
Calculate Digit Product
Quickly multiply all the digits of the given numbers.