Monthly Payment Estimator

Realestate12: Monthly Payment Estimator

A mortgage estimator for a development's sales page: a tall photograph beside a price field, term pills and two sliders for deposit and interest rate. The estimated monthly payment is a large figure that springs to each new value, with a two-colour bar splitting principal from interest, three breakdown figures under hairlines, a sales button and a disclaimer.

Installation

Swap YOUR_EMAIL and YOUR_KEY for the email and license key on your account. Find your license key on your account page.

Radix flavor

npx shadcn add "https://beste.dev/r/realestate12?email=YOUR_EMAIL&license_key=YOUR_KEY"

Base UI flavor

npx shadcn add "https://beste.dev/r-base/realestate12?email=YOUR_EMAIL&license_key=YOUR_KEY"

This installs the block to components/beste/block/realestate12.tsx plus the badge24 rule eyebrow, the button25 quiet pill used for the sales button, and the shadcn/ui button, input and slider primitives behind them, the price field and the two sliders.

Quick start

The installed file exports realestate12Demo alongside the block: the exact props behind the preview above. Spread it to get a working section in one line.

import { Realestate12, realestate12Demo } from "@/components/beste/block/realestate12";

export default function Page() {
  return <Realestate12 {...realestate12Demo} />;
}

Then replace the demo with your own props. Written out, a trimmed setup looks like this:

import { Realestate12 } from "@/components/beste/block/realestate12";

export default function Page() {
  return (
    <Realestate12
      eyebrow="What it costs each month"
      heading="A two bedroom at Alder Row, worked out"
      description="Move the deposit and the rate to see how the monthly payment changes."
      image={{
        src: "https://oud.pics/b/realestate/alder-courtyard-kitchen.webp",
        alt: "An open kitchen with oak cabinets and a pale stone island",
      }}
      price={640000}
      deposit={{ value: 20, min: 5, max: 60, step: 5 }}
      rate={{ value: 5.4, min: 1, max: 12, step: 0.1 }}
      terms={[15, 20, 25]}
      term={30}
      currency="USD"
      locale="en-US"
      labels={{
        price: "Home price",
        deposit: "Deposit",
        rate: "Interest rate",
        term: "Term",
        years: "years",
        monthly: "Estimated monthly payment",
        perMonth: "a month",
        loan: "Loan amount",
        depositAmount: "Deposit",
        interest: "Total interest",
        principal: "Principal",
      }}
      note="Estimate only. Excludes service charge, insurance and taxes."
      button={{ label: "Talk to the sales team", href: "/contact" }}
    />
  );
}

Props

type Range = { value: number; min: number; max: number; step: number };

type Labels = {
  price?: string;
  deposit?: string;
  rate?: string;
  term?: string;
  years?: string;
  monthly?: string;
  perMonth?: string;
  loan?: string;
  depositAmount?: string;
  interest?: string;
  principal?: string;
};

Behavior notes

• The payment uses the standard amortisation formula on the loan (price minus deposit), the annual rate divided by twelve and the term in months; a zero rate divides the loan evenly over the months.
• The monthly figure is driven by a spring (stiffness 90, damping 22) so it counts towards each new value instead of jumping; with prefers-reduced-motion it shows the exact value at once.
• The price field accepts any typed characters and keeps only the digits, displaying the result with the locale's grouping separators. All currency figures are formatted with Intl.NumberFormat and no decimals.
• The bar under the figure splits principal and interest by their share of the total repaid, animating its widths on every change; the three figures under it are loan amount, deposit amount and total interest.
• The result area (caption, figure, bar, breakdown, button) rises in as one group 0.5 s after the controls, so nothing under the sliders appears unanimated.
• The photograph is gated on its own load event and on the frame being in view, opens from the top once loaded and drifts from -6% to 6% against the scroll; on small screens it moves below the estimator.