45:["$","title",null,{"children":"Roommate Cost Split Calculator | Coupinify | Observable"}] 4d:T138d,{ const calculator = document.createElement("section"); calculator.className = "coupinify-split"; calculator.setAttribute("aria-labelledby", "split-heading"); calculator.innerHTML = `

Compare what each roommate pays

Item price ($) Tax, shipping and fees ($) Future owner's share at checkout (%) Owner pays back at move-out ($)

Checkout total

Future owner pays after reimbursement

Paid at checkout

Other roommate pays after reimbursement

Paid at checkout

Use $0 if you agreed to skip reimbursement. Calculations use USD. The owner's checkout share is rounded to the nearest cent, and the other roommate pays the rest.

`; const fields = Array.from(calculator.querySelectorAll("input")); const error = calculator.querySelector(".split-error"); const money = new Intl.NumberFormat("en-US", {style: "currency", currency: "USD"}); function showAmounts(amounts) { for (const output of calculator.querySelectorAll("[data-value]")) { const cents = amounts?.[output.dataset.value]; output.textContent = cents === undefined ? "—" : money.format(cents / 100); } } function showError(message) { error.textContent = message; error.hidden = message === ""; } function update() { if (fields.some((field) => !field.validity.valid)) { showError("Enter an amount of up to $100,000 in each price field, a whole share from 0% to 100%, and a nonnegative reimbursement."); showAmounts(); return; } const [price, fees, share, reimburse] = fields.map((field) => field.valueAsNumber); const total = Math.round(price * 100) + Math.round(fees * 100); const ownerInitial = Math.round(total * share / 100); const otherInitial = total - ownerInitial; const reimbursement = Math.round(reimburse * 100); if (reimbursement > otherInitial) { showError("Enter a reimbursement at or below the other roommate’s checkout share (" + money.format(otherInitial / 100) + ")."); showAmounts({total, ownerInitial, otherInitial}); return; } showError(""); showAmounts({total, ownerInitial, otherInitial, ownerNet: ownerInitial + reimbursement, otherNet: otherInitial - reimbursement}); } calculator.addEventListener("input", update); update(); display(calculator); }4e:[] 49:{"id":"fcc15bba9d6752b7","slug":"roommate-cost-split-calculator","title":"Roommate Cost Split Calculator","thumbnail":"7e894fce97162b9edadeb5a73bbda602654fe6582c346e656db7f955f63e6c30","access_level":"public","create_time":"$D2026-11-14T16:30:39.121Z","update_time":"$D2026-11-14T16:41:36.528Z","view_time":null,"first_public_time":"$D2026-11-14T16:32:57.315Z","has_unpublished_edits":null,"fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"90fe571503808ec9","login":"coupinify","name":"Coupinify","avatar_url":"https://avatars-next.observableusercontent.com/360f063b7fd49ea3edcf497595703b71b5ae95e4085e92dc45bb31b56e33bc78","tier":"free_2026","bio":"Coupinify publishes shopping checklists and interactive tools to help readers compare costs and read offer terms before checkout.","followed_by_you":false,"follows_you":false},"version":7,"publish_version":7,"role":null,"authored":false,"authors":[{"type":"individual","id":"ff2cb6942d6433de","login":"coupinify","name":"Coupinify","avatar_url":"https://avatars-next.observableusercontent.com/360f063b7fd49ea3edcf497595703b71b5ae95e4085e92dc45bb31b56e33bc78","tier":null,"bio":"Coupinify publishes shopping checklists and interactive tools to help readers compare costs and read offer terms before checkout.","followed_by_you":false,"follows_you":false}],"members":[{"type":"team","id":"90fe571503808ec9","login":"coupinify","name":"Coupinify","avatar_url":"https://avatars-next.observableusercontent.com/360f063b7fd49ea3edcf497595703b71b5ae95e4085e92dc45bb31b56e33bc78","tier":"free_2026","role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"titling":"auto","title":"Roommate Cost Split Calculator","cells":[{"id":1,"value":"# Roommate Cost Split Calculator\n\n**Coupinify · Dorm shopping tools**\n\nWork out what two roommates would pay for one shared item, including checkout fees and any agreed move-out reimbursement. The starting numbers are an example. Replace them with your own amounts.\n\nBefore you split the bill, agree on who keeps the item and receipt, who handles repairs, and what happens if someone moves out early. Use Coupinify’s roommate shopping checklist to decide what to share, split, or buy separately.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":2,"value":"$4d","pinned":false,"hidden":false,"mode":"ts","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W4e","stdlib":"2"}} 44:null