Online Calculator Tools
Work out every number that matters
226 free calculators for loans, tax, health and everyday maths. Type a value and the answer is there, with the formula beside it.
Find a calculator
What people calculate most
- EMIFinance₹50L, 8.5%, 20 years₹43,391/moCalculate
- SIPFinance₹10K/mo, 12%, 15 years₹50.5LCalculate
- BMIHealth & Fitness175 cm, 70 kgBMI 22.9Calculate
- GSTFinance₹25,000 + 18%+₹4,500Calculate
- Income TaxFinanceCompare tax optionsCompareCalculate
- AgeDaily UtilitiesExact ageY · M · DCalculate
- PercentageMath15% / 2,000300Calculate
- Compound InterestFinance₹1L, 8%, 10 years₹2.2LCalculate
- EMIFinance₹50L, 8.5%, 20 years₹43,391/mo
- SIPFinance₹10K/mo, 12%, 15 years₹50.5L
- BMIHealth & Fitness175 cm, 70 kgBMI 22.9
- GSTFinance₹25,000 + 18%+₹4,500
- Income TaxFinanceCompare tax optionsCompare
- AgeDaily UtilitiesExact ageY · M · D
- PercentageMath15% / 2,000300
- Compound InterestFinance₹1L, 8%, 10 years₹2.2L
Calculate right here, no page change
Move a slider and the answer moves with it. Open the full tool for schedules, charts and the formula.
Money, health and maths
Three places most people start. Each one opens a full set of tools.
Everything else in the toolbox
Most-used calculators
- EMI CalculatorCalculate your monthly EMI instantly. Free online EMI calculator for home, car, personal and education loans with full amortization schedule.Finance
- Compound Interest CalculatorFree compound interest calculator. Calculate maturity value with daily, monthly, quarterly or yearly compounding.Finance
- SIP CalculatorCalculate the future value of your monthly mutual fund SIP investments. Free SIP calculator for India with goal planning.Finance
- FD CalculatorCalculate maturity amount and interest earned on Fixed Deposits across all major Indian banks.Finance
- PPF CalculatorCalculate maturity of your Public Provident Fund (PPF) account with current 7.1% rate. 15-year and extended terms supported.Finance
- Retirement CalculatorPlan your retirement corpus, monthly savings needed, and post-retirement income with adjustable inflation.Finance
Numbers you can check
The formula is on the page
Every calculator prints its equation and what each symbol means, so you can check the maths yourself.
Defaults built for your country
Currency, number format and typical amounts follow the country you choose. Switch any time.
Your inputs stay with you
All calculations run in your browser. Nothing you type is sent to a server.
Questions people ask
Are these calculators free to use?
Yes. Every calculator is free, needs no sign-up and has no usage limit.
Is my data stored or sent anywhere?
No. Calculations run in your browser, so the numbers you enter never leave your device.
How accurate are the results?
Each tool uses the standard formula for its topic and shows it on the page. Loan and tax results are estimates, because lenders and tax rules add fees and rounding of their own.
Can I use it outside India?
Yes. Money tools adapt to your country, and many health and unit tools support metric, US and UK units.
A calculator is missing. Can I ask for it?
Please do. Send the name through the contact page and we add useful ones regularly.
Why Online Calculator Tools?
Online Calculator Tools is a single home for the calculators and converters that Indian students, professionals, founders, parents and home-owners reach for every day. Loan EMIs, SIP planning, GST, income tax, BMI, body fat, due-date, GPA, attendance, concrete, tile, paint, electricity bill, IP subnet, base64, dew point, dice, love - every common need lives at a clean URL with the same fast UI. Nothing to install. No signup. Your inputs never leave your device.
Built India-first, but globally usable
Defaults reflect Indian banking, tax and lifestyle - INR currency, Indian tax slabs (old and new regime), state-wise electricity tariffs, Asia-Pacific BMI cut-offs, Naegele's pregnancy rule, gaj / bigha land units, 50 kg cement bags and metric measurements. When a tool needs imperial or non-Indian defaults (US Navy body-fat, US tons of gravel, IRC stair codes, NWS weather formulas) those are exposed clearly so the same tool serves a global audience.
Accuracy is auditable
Every tool page shows the formula, the legend for each variable, a "How it works" section, a hand-written FAQ block and a clear disclaimer. We don't hide the math behind a black box. If a result feels off, you can see exactly which inputs and which equation produced it. For finance and health calculators we use the same formulas that banks, insurers and dieticians use - Mifflin-St Jeor for BMR, monthly reducing balance for EMI, IRDAI's depreciation schedule for IDV, and so on.
Fast, mobile-first and offline-friendly
Pages are statically rendered HTML, optimised for sub-second loads on 3G. The UI is mobile-first and scales up cleanly to tablets and desktops. Every calculator works offline once the page is in your browser cache - only the live data tools (currency, crypto) need a network. There is no popup, no chat widget, no auto-playing video. Just the tool, the result, and the explanation.
How to navigate Online Calculator Tools
Use the search bar at the top of any page to jump straight to a tool. Browse by one of 9 categories - Finance, Health & Fitness, Converters, Math, Daily Utilities, Home & Lifestyle, Vehicle, Education, Business - or open a popular tool from the grid above. Every tool page links to six related calculators at the bottom, so you can move from EMI to amortisation to refinance, or from BMI to BMR to TDEE to macro split, without going back to the home page.