Calcrux
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Calcrux is a free calculator platform covering five areas: ecommerce seller economics (Amazon FBA, eBay, Etsy, Shopify, Walmart, Flipkart fees and profit), India business (income tax, GST, in-hand salary, PPF, NPS, EPF โ FY 2025-26), manufacturing (OEE, takt time, safety stock), startup finance (burn rate, SaaS metrics, equity dilution), and investing (SIP, lumpsum, compound interest). Every tool is free with no account required; all calculations run client-side, so no data leaves the browser. Fee tables cite their sources and carry a last-verified date.
Calcrux
Vim Python IDECalcrux's answer
Calcrux is used by ecommerce sellers to calculate Amazon FBA profit and marketplace fees, by manufacturers to measure OEE and equipment reliability, by investors to project SIP and lump-sum returns, by founders to model burn rate and runway, and by Indian professionals to compute salary and income tax โ all free, no sign-up.
Calcrux's answer
Calcrux specialises in business operations where those tools are general-purpose. Each tool includes domain benchmarks, smart insights, and formulas verified against professional standards โ not textbook approximations. We also deliver features that paid tools like Helium 10 and Jungle Scout charge for, free.
Calcrux's answer
Calcrux is a free online business calculator platform with 78+ tools for ecommerce sellers, manufacturers, startup founders, and investors. Every calculator runs instantly in your browser โ covering 9 countries and 9 currencies โ with no account, no paywall, and no limit. free calculators across five domains: ecommerce (Amazon FBA, Shopify profit, eBay fees), financial planning (SIP, compound interest, lump sum), manufacturing (OEE, MTBF/MTTR, takt time), India business (salary, income tax, HRA, EPF), and startup analytics (burn rate, LTV/CAC, equity dilution). Every tool runs free in your browser.
Omni Calculator - Helping you make rational decisions, one calculation at a time.
calculator.net - Online calculator for quick calculations, along with a large collection of calculators on math, finance, fitness, and more, each with related in-depth information.
Build vs. Buy Calculator - Should you build an internal tool? Or just buy it?
Calcfort - Free calculators for maths, finance, health and engineering. Get instant results โ fast, accurate and easy to use.
CalcFuel - Free online calculators for finance, marketing, email, social media, and more. Instant answers, no sign-up required.
Calcix - Access 1000+ free financial and business calculators for loans, mortgages, investments, taxes, retirement planning, and more. Fast, accurate, and completely private.