# hiroshan.com — Free Calculators & Tools

> A large, no-signup library of free calculators by Roshan Tiwari. Each tool runs
> entirely in the browser, shows the exact formula it uses, and cites its sources.
> Categories: finance, US & global tax, unit converters, health & fitness, real
> estate, creator earnings, and e-commerce marketplace seller tools.

## Calculator directories

- [All tools](https://hiroshan.com/tools): index of every calculator directory
- [Finance](https://hiroshan.com/finance): loan/EMI, mortgage, compound interest, ROI, CAGR, 401k, net worth, affordability
- [Unit converters](https://hiroshan.com/convert): length, weight, temperature, volume, speed, area, data, time
- [Health & fitness](https://hiroshan.com/health): BMR, TDEE, body fat %, ideal weight, macros, one-rep max, running pace, water intake
- [US state tax](https://hiroshan.com/tax): state income, sales, property, capital gains, self-employment, car sales, tax burden
- [US federal tax](https://hiroshan.com/federal-tax): income, paycheck take-home, self-employment, capital gains, FICA, quarterly, LLC/S-corp/C-corp
- [Global tax](https://hiroshan.com/global-tax): income tax, VAT/GST and import duty by country
- [County tax](https://hiroshan.com/county-tax): local property and sales tax for major US counties
- [Real estate](https://hiroshan.com/realestate): cap rate, cash-on-cash, rental yield, GRM, NOI, DSCR, price-to-rent, fix-and-flip
- [Creator earnings](https://hiroshan.com/creator): YouTube, TikTok, Instagram, Twitch and podcast earnings, plus ROAS, CPM, engagement rate
- [Marketplace seller tools](https://hiroshan.com/marketplace): fees, profit, pricing and break-even for 75+ marketplaces
- [Amazon KDP](https://hiroshan.com/kdp): royalties, printing cost, ads ROI, pricing for self-publishers
- [Etsy](https://hiroshan.com/etsy): fees, profit, pricing, offsite ads, break-even

## Resources

- [Sitemap](https://hiroshan.com/sitemap.xml): every live page

## Notes for agents

- Static site — no login, no API, no user accounts. All calculations are client-side.
- Every calculator page includes the formula used and a linked authoritative source under a "Sources & method" section.
- Tax rates, fees and benchmark figures are estimates for planning and are not professional financial, tax or medical advice.
- Content usage preferences are declared via Content-Signal in /robots.txt.