Set Vector Length
Create vectors with specific lengths. 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 Set Vector Length
- 1. Paste your vector. Enter one direction vector per line, for example (3, 4). The tool preserves its direction while rescaling it to a specific magnitude.
- 2. Set the target length and decimal places. Choose Target length, the magnitude you want the output vector to have, and Decimal places to control rounding of the resulting components.
- 3. Copy the resized vector. The output pane shows a vector pointing in the same direction as your input but stretched or shrunk to your target length. Copy it into your calculation.
When to use Set Vector Length
Set Vector Length rescales a vector to a specific magnitude while keeping its direction unchanged, the practical opposite of normalizing to length 1. Use it whenever you know a direction but need a vector of a particular size.
- Setting a projectile's initial speed in a physics problem. You know the direction a projectile is launched but need the initial velocity vector to have a specific speed, and rescaling the direction vector to that magnitude gives you the exact starting velocity.
- Drawing a force arrow at a fixed diagram scale. You are drawing several force vectors on a diagram and need each one rescaled to a consistent visual length representing its magnitude, keeping the direction accurate to the original data.
- Setting a game character's movement speed vector. A game prototype has a direction the player wants to move in, and rescaling that direction to a fixed movement speed produces the velocity vector to apply each frame.
- Checking a rescaling homework step. A physics or linear algebra assignment asks you to rescale a vector to a specific magnitude while preserving direction, and confirming the result here catches any normalization error before submission.
Examples
Stretch a unit direction to length 10
Input
(3, 4)
Output
(6.000000, 8.000000)
About the Set Vector Length tool
Set Vector Length runs as plain JavaScript in your browser tab, with no server behind it. Create vectors with specific lengths. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Math Tools section, 234 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 2 settings, including Target length and Decimal places, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
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 Set Vector Length 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.