# Plainso

> Free interactive calculators and estimators for freelancers, founders, and small businesses. Every tool runs in the browser, requires no account, works with any currency, and can be embedded on any website with an iframe snippet.

Plainso is a collection of free, embeddable calculators for business math: freelancer rates, startup runway, profit margins, project quotes, salary-to-hourly conversion, percentages, loan EMIs, GST, SIPs, and age calculation. All tools are free to use and free to embed (with a "Powered by Plainso" link). No accounts, no data collection on tool inputs — calculations happen entirely in the browser. Visitors can pick their own currency and locale for any money calculation.

## Key pages

- [Home](https://plainso.com/): overview and popular tools
- [All tools](https://plainso.com/tools): complete directory of calculators
- [Pricing](https://plainso.com/pricing.md): pricing information in machine-readable form
- [Embedding guide](https://plainso.com/#how-to-embed): how to embed a calculator on your website
- [Blog](https://plainso.com/blog): guides on freelance pricing, GST/EMI math, and using calculators for lead generation

## Tools

- [Freelancer Rate Calculator](https://plainso.com/tools/freelancer-rate): minimum hourly rate from your income target
- [Startup Runway Calculator](https://plainso.com/tools/startup-runway): months of runway from cash and monthly burn
- [Profit Margin Calculator](https://plainso.com/tools/profit-margin): margin and markup from cost and selling price
- [Project Quote Calculator](https://plainso.com/tools/project-quote): project price range from pages, integrations, and timeline
- [Salary to Hourly Rate Calculator](https://plainso.com/tools/salary-to-hourly): hourly equivalent of an annual salary
- [Percentage Calculator](https://plainso.com/tools/percentage): percentage of a number, increase and decrease
- [Loan EMI Calculator](https://plainso.com/tools/loan-emi): monthly EMI, total interest, and total repayment
- [GST Calculator](https://plainso.com/tools/gst-calculator): GST-inclusive and GST-exclusive amounts at all Indian slab rates
- [SIP Calculator](https://plainso.com/tools/sip-calculator): future value of a monthly SIP investment
- [Age Calculator](https://plainso.com/tools/age-calculator): exact age in years, months, and days

## Embedding

Every tool can be embedded on any website (WordPress, Shopify, Webflow, or plain HTML) with a single iframe snippet:

```
<iframe src="https://plainso.com/embed/{tool-slug}" width="100%" height="600" style="border:0;border-radius:12px;" loading="lazy" title="Plainso calculator"></iframe>
```

No JavaScript, no API keys, no setup. Embedded tools are free and carry a small "Powered by Plainso" link.

## Contact

For support, feedback, or partnership inquiries: hello@plainso.com