Calculate the Modulo
Find the modulus of a number. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Calculate the Modulo
- 1. Paste your numbers. Enter one or more numbers, one per line or separated by commas. Each one is divided by the same divisor.
- 2. Set the divisor. Enter the Divisor to compute the remainder against, using Euclidean modulo so the result is always non-negative even for negative inputs.
- 3. Copy the remainders. Copy the resulting remainders from the output for your programming, scheduling or number theory work.
When to use Calculate the Modulo
Calculate the Modulo finds the remainder when dividing each number by a fixed divisor, using Euclidean modulo so results stay non-negative even with negative inputs. It is aimed at anyone checking a mod operation across a batch of values at once.
- Debugging a modulo operator across languages. You noticed a programming language's percent operator returns a negative result for negative inputs, and want the mathematically correct Euclidean remainder to compare against.
- Building a rotation or wraparound index. You are implementing a circular buffer or wraparound array index and need the correct non-negative remainder for a batch of test index values.
- Checking a scheduling cycle. A recurring task repeats every n days, and you want to know which day of the cycle several future dates fall on by computing their remainder against n.
- Verifying a divisibility test. You want to quickly check whether several numbers are divisible by a specific divisor by confirming their remainder comes out to zero.
Examples
Remainders modulo 3
Input
7 10 12
Output
1 1 0
Negatives use the math (non-negative) modulo, so -7 mod 3 = 2
Input
-7 -1
Output
2 2
About the Calculate the Modulo tool
Calculate the Modulo runs as plain JavaScript in your browser tab, with no server behind it. Find the modulus of a number. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Number Tools section, 194 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with the Divisor 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.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Calculate the Modulo cost anything?
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?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
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?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
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.