Calcrux
Free calculators for sellers, investors & businesses
Calcrux is a free calculator platform for people who run businesses, sell online, manage operations, or make financial decisions. Every tool
runs entirely in your browser — no account, no sign-up, no data sent anywhere. Supports 9 currencies with automatic region detection, so it
works whether you're an Amazon seller in the US, a business owner in India, or a founder in Europe.
Features
- Completely free — no account, no sign-up, no paywalls
- All calculations run client-side — your data never leaves your browser
- Auto-detects your region and currency on arrival
- Covers ecommerce, India business & tax, manufacturing, startup finance, and investing
- Fee tables are sourced and date-stamped — not estimates
- Works across 9 currencies and 150+ countries
- Mobile-friendly, fast, no app install required
- Growing library — new tools added regularly across all categories
Use Cases
- An Amazon seller checking whether a product is actually profitable after fees before listing it
- A salaried employee in India calculating their exact in-hand salary after tax and deductions
- A startup founder running burn rate and runway numbers before a board meeting
- A manufacturer calculating OEE or takt time without buying expensive operations software
- An investor comparing SIP vs lump sum returns before deciding how to deploy savings
- A freelancer or small business owner estimating GST liability before filing
- A founder modeling equity dilution before agreeing to funding terms
Comments
Most good business calculators are locked behind subscriptions or apps that want your account before giving you a number. Calcrux exists to fix that — free tools that are actually accurate, require zero sign-up, and run entirely in your browser. Starting with ecommerce, India business, and startup finance, because that's where I felt the gap most.
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Comments
Most good business calculators are locked behind subscriptions or apps that want your account before giving you a number. Calcrux exists to fix that — free tools that are actually accurate, require zero sign-up, and run entirely in your browser. Starting with ecommerce, India business, and startup finance, because that's where I felt the gap most.
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