Every calculation you need,
in one private hub.
MasterCal is a free, open, browser-based suite of 53+ precision calculators across 5 domains. No accounts. No ads. No data leaving your device.
Democratise financial clarity
Too many important decisions — buying a home, planning for retirement, starting a SIP, understanding your tax liability — are made without clear numbers. Spreadsheets are intimidating. Financial advisors are expensive. Random websites are cluttered, ad-heavy, or require an email address just to see a result.
MasterCal exists to remove every one of those barriers. Open a page, move a slider, get an instant answer. That's it. No friction, no cost, no compromise on privacy.
Built on six principles
Instant results
Every calculator recalculates the moment you move a slider or change a value. No submit button — ever. Results update live so you can explore scenarios freely.
Completely private
All calculations happen locally in your browser. We don't send your salary, loan amount, or health data to any server. Nothing is stored. Nothing is tracked.
Accuracy first
Every formula is sourced and referenced. Rate-sensitive values (PPF, income tax slabs, GST) are dated and attributed so you always know what data backs the result.
Built for India, useful everywhere
Primary currency is INR with Indian-aware conventions (Lakhs, Crores, EPF, GST, income tax regimes). All money tools also support USD and EUR.
Accessible by design
Every input has a label. Sliders are keyboard-operable. Colour contrast meets WCAG AA. The content is fully readable with JavaScript disabled.
Fast & lightweight
A static site served from Cloudflare's global CDN. No server to spin up, no API calls on load. Just HTML, CSS, and the minimal JS needed for interactivity.
Pure client-side, always
You open a calculator
The page loads from Cloudflare's global CDN as plain static HTML — fast on any connection, anywhere in the world.
You adjust inputs
Sliders, number fields, dropdowns, and toggles — all bound live. Change any value and results update within milliseconds.
JavaScript does the math
Every formula runs in your browser tab. Your numbers never leave your device. No backend, no API, no logging.
You get clarity
Headline result, breakdown, formula, worked example, and FAQs — all server-rendered for instant readability and full SEO indexing.
Common questions
Is MasterCal really free?
Yes — completely free, forever. There are no premium tiers, no paywalls, and no hidden charges.
Do you store my data?
No. All calculations run entirely in your browser. We have no servers processing your inputs, and we do not use cookies or analytics trackers.
How accurate are the results?
Results are accurate for planning and estimation purposes. Finance tools use standard formulas. Tax tools include the financial year and regime so you know exactly which rules apply. Always verify with a qualified professional before making major financial decisions.
Can I suggest a new calculator?
Absolutely. Reach out via the contact page and we'll consider it for a future update.
Why is income tax showing an old slab?
Tax slabs change with each Union Budget. The calculator shows the FY and regime it uses. If a newer budget has changed the slabs, please let us know and we'll update promptly.
Ready to start calculating?
53 free tools, zero sign-up, instant results.