Built for people who want to understand their money
Not just the numbers — the reasoning behind them.
What Calculious Is
Calculious is a free financial tools and education platform built for individuals in India, the United States, the United Kingdom and Australia. Every calculator is built from primary source data — actual tax legislation, ATO tables, HMRC rates, IRS publications — not approximations or third-party APIs that can silently go stale.
We cover the questions real people Google at 11pm: "What will my actual take-home be on this salary?" "How much CGT will I pay if I sell now vs next year?" "How much interest am I actually paying on this loan?"
Why We Built It
Most financial calculators online fall into one of three traps: they're too simplified (ignoring surcharge, Medicare Levy Surcharge, the UK 60% trap), they're geographically limited (built for one country, useless for everyone else), or they require you to create an account just to do basic maths.
Calculious is none of those things. Everything runs locally in your browser — no account, no sign-in, no data transmitted anywhere. Your numbers stay yours.
Who's Behind Calculious
Calculious is built and maintained by its founder, Imran Hussain. It started from a simple frustration: the financial calculators online were either subtly wrong, buried under ads, or locked behind a sign-up just to do basic maths. So the goal became straightforward — build the clearest, most accurate free money tools on the internet, and explain the reasoning behind every number.
Every calculator and guide is checked by hand against the official government source before it goes live, and reviewed each financial year when budgets change. This is a genuinely independent project — not backed by any bank, broker or lender — which is why the numbers you see aren't nudged to sell you a product. If you ever spot a figure that looks off, tell us; a real person reads and replies.
Our Mission
Money decisions are stressful mostly because the information is confusing, scattered, or trying to sell you something. Our mission is to remove that friction — to be the place you can trust for a fast, correct answer to "what does this actually mean for me?", whether that's your take-home salary, your loan EMI, or your tax bill. Free, private, and clear. That's the whole idea.
What We Cover
Data Sources
We update our tax data from official government sources each financial year:
- India: Income Tax Department (incometax.gov.in), CBDT circulars, Finance Acts, GST Council notifications, CBIC
- USA: IRS Revenue Procedures (Rev. Proc.), IRS Publications 15, 550, 523. Social Security Administration wage base.
- UK: HMRC (hmrc.gov.uk), gov.uk rate tables, Finance Acts. Scottish rates from Scottish Parliament.
- Australia: Australian Taxation Office (ato.gov.au), Treasury Budget papers, ASIC.
Accuracy & Limitations
Our calculators handle the most common scenarios correctly. There are edge cases we simplify or omit: inter-state variation in US sales tax, Scottish income tax rates, complex superannuation defined benefit schemes, and situations involving multiple income sources across countries. For personal tax advice specific to your situation, consult a qualified tax professional.
All information on Calculious is for educational purposes only and does not constitute financial, tax, or legal advice.