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FINANCE & BUDGETING

Rent Split Calculator

Divide rent, utilities, and shared household bills between roommates using equal shares or custom weights for room size and agreements.

Tool statusRuns in your browser
Preview

Bills

Results

Total shared
$2,150.00
Equal average
$716.67
PersonWeightShare
Ana1$651.52
Bo1$651.52
Chris1.3$846.97

Use higher weights for larger rooms or agreed extras.

How it works

  1. Enter your input

    Fill in the values, paste your text, or upload the file this tool works with.

  2. See results instantly

    Most tools update live as you type; a few use a single button. Either way, the result appears right on this page.

  3. Use your results

    Copy, download, or share what the tool produces — you're always in control of the output.

Privacy and processing — Runs locally in your browser. This tool does not upload your input.

What is Rent Split Calculator?

A rent split calculator divides total rent and shared utilities among roommates, either evenly or by a weight each roommate agrees to — useful when rooms differ in size or amenities.

UNDERSTAND THE TOOL

How to split rent by weight

Use this tool to split rent and shared bills evenly, or by a weighted agreement based on room size, private bathroom, or whatever roommates have already agreed reflects a fair share.

How a weighted split works

Every roommate gets a weight (1 by default). Each share is that roommate's weight divided by the sum of everyone's weights, applied to the combined rent and utilities.

Total to split
rent + utilities
Each share
total * (weight / sum of all weights)

$2,200 total, weights of 1 and 2

The roommate with weight 2 pays twice as much as the one with weight 1: $733.33 and $1,466.67.

2200 * (1/3) = 733.33; 2200 * (2/3) = 1466.67

Common reasons to use different weights

  • A noticeably bigger room, or one with its own bathroom.
  • A reserved parking spot or private storage that only one roommate uses.
  • A short-term guest paying a partial share instead of a full one.

Keeping the split fair over time

  • Revisit weights when someone moves in, moves out, or swaps rooms.
  • Agree on how one-off shared costs (a repair, shared furniture) get split before they come up, not after.

Weights are an agreement, not a rule

Weights only reflect what the household agrees is fair — a bigger room or private bathroom is a common reason to use one, but the number itself carries no legal weight. Confirm everyone actually agrees with the model before splitting the real payment.

Frequently Asked Questions

What does a weight of 1.3 mean?

That roommate pays 1.3 shares for every 1 share someone with the default weight pays.

Can I split everything equally?

Yes — leave every roommate at the default weight of 1, or set them all to the same number.

Can I include utilities in the split?

Yes — enter them in the utilities field and they're combined with rent before splitting.

How do I enter roommates?

One per line, optionally followed by a comma and their weight, like "Alex, 1.5" — leave the weight off for the default of 1.

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