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One studio for everyday math — keypad arithmetic, scientific functions, loans, GST, discounts, health, dates, units, fuel, and splitting the bill. Switch modes; your last choice sticks in this browser.
Basic · Everyday arithmetic
Add, subtract, multiply, divide — type with your keyboard too.
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OmniCalc on Rishtaara is a free multi-mode calculator for the numbers people look up every day. Instead of opening a different site for EMI, GST, BMI, or unit conversion, you switch modes in one studio — and your last mode is remembered in this browser.
The keypad modes cover basic arithmetic and scientific functions (powers, roots, trig helpers). Money modes estimate EMI, simple/compound interest, GST add/remove, and discount savings with INR-friendly formatting. Life utilities cover BMI, age, date gaps, unit conversion, trip fuel cost, and fair bill splits.
All results are estimates for planning and learning. Bank EMIs, tax filings, medical advice, and official conversions can differ — always confirm critical numbers with a bank statement, CA, doctor, or official source before you act.
Pick a mode, enter values, and read the result — no signup.
Open basic, scientific, EMI, GST, BMI, unit converter, or another helper from the mode list.
Type amounts, rates, dates, or measurements. Fields are labelled for each calculator type.
See EMI, tax, BMI category, converted units, or keypad output instantly as you change inputs.
Jump to another mode without leaving the page. Your last selection is kept for the next visit on this device.
Basic and scientific keypads with keyboard support — plus percentage change, tips, and quick mental-math helpers.
EMI, simple/compound interest, GST add/remove, and discount savings — formatted in INR where it matters.
BMI, age, date gaps, unit conversion, trip fuel cost, and fair bill splits — all without leaving the page.
Stop juggling five calculator bookmarks. Keep OmniCalc pinned and switch modes when the task changes.
Enter principal, rate, and tenure to see monthly EMI and total interest before you talk to a bank.
Add or remove 5%, 12%, 18%, or 28% GST to check taxable value and tax amount on a quote.
Quick personal health or form-filling helpers — not a diagnosis, just a standard formula result.
Estimate petrol cost for a distance, or divide a restaurant bill fairly among friends.
Yes. All modes are free to use with no account. Results run in your browser session.
It uses the standard reducing-balance EMI formula. Actual bank schedules can differ slightly due to fees, floating rates, or day-count conventions — treat it as a planning estimate.
Standard Indian slabs are highlighted. If your invoice uses another rate, confirm with your CA or the official GST schedule for that goods/service class.
No. BMI is a simple height–weight index. Athletes, children, and some medical conditions need professional interpretation.
Yes. Use any modern phone or tablet browser — the studio is built for touch and small screens.
OmniCalc is an estimate helper — bank EMIs, GST filings, and medical advice can differ. Double-check important numbers before you act on them.