One line of code. Six categories. Instant calculations. The FinCalcs multi-calculator widget gives your readers mortgage, investing, debt, income, auto, and budgeting tools — all in a single embed.
Choose your settings below. The preview and embed code update instantly.
Copy and paste this into your website's HTML — between the <body> tags, wherever you want the calculator to appear.
Mortgage, debt, investing, income, auto, and budgeting — your readers get a complete financial toolkit without leaving your page.
No API keys, no accounts, no configuration files. Paste a single script tag and the widget renders instantly. Works on any platform.
Renders inside a sandboxed iframe. Your site's styles stay untouched. The widget adapts to any width you set.
No fees, no usage limits, no premium tiers. All 26 calculators are free for commercial and personal sites.
Clean light design that works on any background. Dark mode support coming soon.
Every input updates results instantly — no page reloads, no submit buttons. Professional-grade amortization and compound interest math.
| Category | Calculators | Keys |
|---|---|---|
| Mortgage | Mortgage Payment, How Much Can I Afford, Refinance Savings, Amortization, Bi-Weekly Savings | mortgage afford refinance amortize biweekly |
| Debt & Savings | Loan Payment, Credit Card Payoff, Emergency Fund, Savings Goal, BNPL Cost | loan creditcard emergency savings bnpl |
| Investing | Compound Interest, Retirement, 401(k), Roth vs Traditional, Dividend Income | compound retirement k401 roth dividend |
| Income | Take-Home Pay, Hourly to Salary, Overtime, Self-Employment Tax, Raise Impact | takehome hourly overtime selfemploy raise |
| Auto | Car Loan, Lease vs Buy, Gas Cost | carloan lease gas |
| Tools | 50/30/20 Budget, Inflation, Tip Calculator | budget inflation tip |
The widget includes 26 of our most popular tools. Explore the full library on fincalcs.co.