Website Calculator Builder
Build a website calculator in minutes for free with AI. Write in plain English or tap buttons to create your website.
How to Use the Website Calculator Builder
Website Calculator Builder Example
Built with Replit.
Build your vision in minutes for free without writing a single line of code.
Prompting the Website Calculator Builder
Build a mortgage calculator website that calculates monthly payments including property taxes, homeowners insurance, and PMI, displays a month-by-month amortization schedule, offers an extra payment simulator (one-time and recurring) showing interest savings and new payoff dates, and provides a side-by-side fixed-rate vs ARM comparison with projected payments.
Build a responsive BMI calculator that toggles metric/imperial inputs (cm/kg or ft/in/lb), instantly classifies results into standard BMI categories with brief health context, provides a goal weight planner for a user-selected healthy-range BMI, and includes a waist-to-height ratio assessment for central adiposity risk.
Build a responsive loan calculator that lets users choose payment frequency (monthly, biweekly, weekly), select interest type (simple, compound, amortizing), run early payoff analysis (lump-sum or increased payments), and outputs a total cost breakdown (total principal, total interest, average monthly payment) plus new payoff date and savings.
Build a currency converter website calculator that fetches live exchange rates for major and minor pairs, displays interactive 7-day to 5-year historical charts, supports fee-inclusive pricing by adding bank/card fees and spreads to show the real received amount, and includes a multi-currency watchlist with target-threshold rate alerts.
Top Website Calculator Features by Type
Mortgage Calculator
Amortization Schedule
Displays a month-by-month breakdown of principal and interest over the loan term. This helps users see how their balance decreases and plan long-term finances.
Extra Payment Simulator
Lets users add one-time or recurring extra payments and instantly see interest savings and new payoff dates. This motivates smarter repayment and highlights the impact of small changes.
Taxes, Insurance, PMI
Includes property taxes, homeowners insurance, and PMI in monthly payment estimates. This provides a realistic total payment, reducing surprises at closing.
Fixed vs ARM Comparison
Compares fixed-rate and adjustable-rate scenarios side-by-side with projected payments. This clarifies trade-offs and supports better rate selection.
Bmi Calculator
Metric/Imperial Toggle
Allows height and weight entry in cm/kg or ft/in/lb. This reduces friction and errors for users worldwide.
BMI Category Insights
Instantly classifies results into standard categories with brief health context. This helps users interpret numbers beyond the raw BMI value.
Goal Weight Planner
Calculates target weights for a user-selected BMI within a healthy range. This gives a clear, actionable goal tied to measurable outcomes.
Waist-to-Height Check
Includes a quick waist-to-height ratio assessment alongside BMI. This adds a simple risk screen that can be more indicative of central adiposity.
Loan Calculator
Payment Frequency
Supports monthly, biweekly, and weekly payment schedules. This shows how cadence affects interest costs and payoff time.
Interest Type Options
Handles simple, compound, and amortizing interest structures. This makes the tool useful for personal, auto, and business loans alike.
Early Payoff Analysis
Models lump-sum or increased-payment strategies to estimate savings and new end dates. This empowers users to craft optimal repayment plans.
Total Cost Breakdown
Summarizes total principal, total interest, and average monthly payment. This provides a clear snapshot of the loan’s true cost.
Currency Converter
Live Exchange Rates
Fetches real-time rates for major and minor currency pairs. This ensures conversions are current and trustworthy.
Historical Charts
Shows interactive charts with 7-day to 5-year horizons. This helps users time conversions based on trends and volatility.
Fee-Inclusive Pricing
Lets users add bank or card fees and spreads to see the real received amount. This prevents unpleasant surprises during transfers or travel.
Multi-Currency Watchlist
Allows saving favorite pairs with rate alerts at target thresholds. This keeps users informed and ready to act quickly.
The Website Calculator of Your Dreams
Build your vision in minutes for free without writing a single line of code.
FAQ about the Website Calculator Builder
Can I build a website calculator without coding experience?
Yes. Describe the calculator you want in natural language and Replit AI Agent will generate a working app in your browser IDE, then the Assistant can refine it. Use the Visual Editor for quick UI tweaks while the full code editor remains available for deeper changes. It’s an AI-assisted, code-based workflow (not a pure no‑code platform), so beginners can build fast and developers can customize as needed.
How fast can I create and deploy a calculator?
Pick a Quickstart: Remix a template for the fastest start or Build from Scratch for full control. You’ll see a real-time preview as you build, and when ready you can one-click deploy to the cloud. Connect a custom domain with SSL/TLS automatically. You can even create and ship from the Replit mobile app.
Can I start from a design or existing project?
Yes—start from design or code. Import from Figma to turn your mockups into a responsive React UI with components and assets generated for you. Or bring in an existing repo via GitHub import, or migrate with Bolt migration or Lovable import to keep momentum. The Agent and Assistant can then adapt the structure to your calculator’s needs.
How do I add formulas, validation, and logic to my calculator?
Explain the formulas and validation you need, and the Assistant will propose code suggestions with autocomplete, then make precise edits for you. You review a code diff and Apply All diffs when satisfied, with debugging help if issues arise. This works whether your calculator uses React on the front end, Node or Python on the back end, or a full-stack setup. The Assistant can also generate documentation so teammates understand the logic.
How can my calculator store results, send emails, or take payments?
Yes—ask the Agent for database integration and it can provision a managed PostgreSQL database or a built-in key-value store to persist results. It can wire up Stripe or PayPal to take payments, and SendGrid or Twilio to send confirmations or messages. Add Google OAuth for sign-in, with credentials stored securely in the Secrets manager. You focus on logic while the AI adds the glue code.
Does this include a full drag-and-drop builder?
Replit includes a Visual Editor for UI tweaks, but it is not a full drag-and-drop builder. There are drag-and-drop limitations: complex logic, state, and backend are handled in code. The primary workflow is code-based using components and CSS, with AI helping bridge gaps. This keeps visual edits quick while preserving full power in the editor.
What safety nets exist if changes break the calculator?
Every AI change creates Checkpoints you can restore with Rollback if something breaks. You can review code diffs before applying them, and integrations with version control keep history intact. Rollback also restores the environment for a clean state. This lets you experiment confidently.
Can my calculator use live, up-to-date data?
Yes—your calculator can fetch live, up-to-date data via external services and live APIs. The Agent’s Web Search integration can research the latest docs when needed and include source citations. You can build data fetching into your app so results always reflect current information. The workflow stays inside Replit, end to end.