Embed any calculator on your site
Free, privacy-first, and zero-config. Drop a single iframe into your page and give your users powerful financial calculators — no API keys, no rate limits, no cost.
Everything you need, nothing you don't
Built for developers, bloggers, and businesses who want powerful calculators without the overhead.
Instant Integration
Drop a single line of code into your page. The calculator loads instantly — no build step, no dependencies.
Privacy-Preserving
All calculations run client-side in the iframe. Your users' inputs never touch a server. Zero data collection.
Fully Responsive
Embeds automatically adapt to any container width — from mobile sidebars to full-width dashboards.
Theme-Aware
Supports light and dark modes out of the box. Inherits the host page's color scheme or override with custom themes.
Clean API
Simple URL parameters for default values. No SDK, no authentication tokens, no rate limits. Just URLs.
100% Free
No paid tiers, no API keys, no usage limits. Embed as many calculators as you want, anywhere, for free.
Three steps to embed
No SDK, no build step, no authentication. Just copy and paste.
Choose a calculator
Browse our library of 49+ finance and business calculators. Pick the one you want to embed.
Copy the embed code
Use the code generator below to customize defaults and copy the iframe snippet.
Paste into your page
Drop the iframe into your HTML. That's it — the calculator works immediately.
Generate your embed snippet
Pick a calculator, customize the size, and copy the code.
Customize with URL params
Pass default values and configuration through the iframe src URL.
| Parameter | Type | Description |
|---|---|---|
| ?theme= | light | dark | auto | Force a specific color theme |
| ?amount= | number | Pre-fill the principal/amount field |
| ?rate= | number | Pre-fill the interest rate field |
| ?term= | number | Pre-fill the loan/investment term |
| ?hideHeader= | boolean | Hide the CalcPro header bar for seamless embedding |
Example URL
https://calc.toolly.site/calculators/loan-calculator?theme=dark&amount=25000&rate=7.5&term=36&hideHeader=trueEmbed any of these calculators
All non-coming-soon calculators are available for embedding.
Loan Calculator
Personal loan monthly payment + amortization schedule.
Auto Loan Calculator
Car financing calculator with trade-in value.
Student Loan Calculator
Student loan payment and payoff timeline.
Credit Card Payoff Calculator
Plan your credit card debt elimination timeline.
Debt Payoff Calculator
Snowball vs avalanche debt elimination planner.
Debt-to-Income Calculator
Calculate your DTI ratio for loan eligibility.
Loan Amortization Calculator
Full amortization schedule with principal & interest.
Early Loan Payoff Calculator
See how extra payments save interest and time.
Mortgage Calculator (PITI)
Monthly payment with principal, interest, taxes & insurance.
Refinance Calculator
Compare refinance savings vs closing costs.
Rent vs Buy Calculator
Compare renting vs buying over time.
House Affordability Calculator
How much house can you afford based on income?
No API keys. No rate limits. No cost.
CalcPro embeds are 100% free for personal and commercial use. No attribution required, no watermark on results.
Related pages
Need a custom embed or have questions?
Reach out if you need help with embedding, want a custom calculator built, or have any questions about our embed API.
Or email us directly at info@toolly.site or tool@toolly.site