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500+ calculators — EMI, income tax, BMI, GST, SIP, percentage, age, currency and more. Used by 5 million users worldwide every month.

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EMI Calculator
Loans & instalment
📊
Income Tax 2026
Old vs New Regime
⚖️
BMI Calculator
WHO standard
🧾
GST Calculator
Add / remove GST
📈
SIP Calculator
Mutual fund returns
🎂
Age Calculator
Exact years & months
%
Percentage
Of · Change · Is
💱
Currency Converter
170+ live rates
Popular Loan
EMI Calculator
Monthly instalment for home, car & personal loans with full amortisation schedule and interest breakdown.
P·r·(1+r)^n/((1+r)^n−1)
 Popular Tax
Income Tax Calculator
Old vs New Regime FY 2025–26. 80C, 80D, HRA, home loan interest deductions included.
FY 2025–26
 Popular Health
BMI Calculator
Body Mass Index with WHO classification, healthy weight range, and personalised health guidance.
WHO 2024
 Popular Tax
GST Calculator
Add or remove GST — all slabs 5%, 12%, 18%, 28% — inclusive and exclusive modes.
Incl · Excl
 Investment
SIP Calculator
Mutual fund SIP returns with CAGR, inflation adjustment, and year-by-year wealth growth chart.
Monthly CAGR
 Popular Math
Percentage Calculator
What % of a number · % change between values · what % one number is of another — all three modes.
Of · Change · Is
 Date & Time
Age Calculator
Exact age in years, months, days and hours with your next birthday countdown.
Exact · Y/M/D
 Live Converter
Currency Converter
Live exchange rates for USD, EUR, GBP, AED, JPY and 170+ world currencies.
Real-time rates
Financial Calculators 80+ tools View all
EMI Calculator
Loan instalment
SIP Calculator
MF returns
FD Calculator
Fixed deposit
PPF Calculator
15-yr savings
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P·(1+r/n)^nt
Gratuity
Service payout
NPS Calculator
Pension corpus
EPF Calculator
PF maturity
Salary / CTC
In-hand salary
Retirement Corpus
Plan early
CAGR Calculator
Annual growth
ROI Calculator
Return on invest
Health & Fitness 60+ tools View all
BMI Calculator
WHO categories
Calorie Calculator
Daily intake
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Basal metabolic
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Activity-adjusted
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Protein·Carbs·Fat
Ideal Weight
3 methods
Due Date
Pregnancy EDD
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Sleep Calculator
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Navy method
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One Rep Max
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Unit Converters 50+ tools View all
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170+ live
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Supports international units, 170+ currencies, global formulas — built for users worldwide.
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500+ Free Online Calculators for the World

From EMI and income tax to BMI and GST — every calculation you need, free, instant, no login required, available globally.

💳 Financial Calculators

EMI Calculator Home Loan EMI Car Loan EMI Mortgage Calculator SIP Calculator FD Calculator PPF Calculator NPS Calculator EPF Calculator Gratuity Calculator Salary / CTC Calculator Compound Interest CAGR Calculator ROI Calculator Inflation Calculator Retirement Calculator FIRE Calculator Budget Planner

🧾 Tax Calculators

Income Tax Calculator GST Calculator TDS Calculator HRA Exemption Capital Gains Tax Stamp Duty

⚕️ Health Calculators

BMI Calculator Calorie Calculator BMR Calculator TDEE Calculator Macro Calculator Due Date Calculator Ovulation Calculator Sleep Calculator Body Fat % Water Intake

📐 Math, Science & Converters

Percentage Calculator Scientific Calculator Standard Deviation Probability P-Value Ohm's Law Currency Converter Length Converter Weight Converter Temperature

🕐 Date, Auto & More

Age Calculator Date Difference GPA Calculator Tip Calculator Electricity Bill Fuel Cost Carbon Footprint EV vs Petrol

The World's Most Comprehensive Free Calculator Platform

Calciva is a free online calculator platform with 500+ calculators across 14 categories — finance, health, tax, math, science, construction, education, ecology, and more. Whether you need an EMI calculator for your home loan, an income tax calculator for FY 2025–26, a BMI calculator to monitor your health, or a GST calculator for your business — Calciva gives you instant, accurate results with zero signup required. Trusted by 5 million users every month from India, the US, UK, UAE, Canada, Australia, and 140+ countries.

Free EMI Calculator — Home, Car & Personal Loans Worldwide

Calciva's EMI calculator is one of the most accurate loan instalment calculators available. Compute monthly EMI for home loans (up to 30 years), car loans (up to 7 years), and personal loans (up to 5 years). Get a complete amortisation schedule, interest-to-principal breakdown chart, and total payment summary — for any loan amount in any currency.

Income Tax Calculator FY 2025–26 (AY 2026–27)

India's most comprehensive income tax calculator supports both Old and New Tax Regimes for FY 2025–26. Add deductions under Section 80C (up to ₹1.5L), Section 80D, HRA exemption, home loan interest under Section 24, and NPS contribution under Section 80CCD. Compare both regimes instantly and discover which option saves you more tax this year.

BMI Calculator — WHO Standard, Global

Our BMI calculator follows WHO 2024 standards and accepts weight in kg or lbs and height in cm, feet, or inches. Results include your BMI value, weight category, and ideal weight range — suitable for adults worldwide. For users of South Asian origin, we also show the Asia-Pacific thresholds where a BMI above 23 is considered overweight.

Frequently Asked Questions

Yes. All 500+ calculators on Calciva are 100% free with no login, no signup, and no subscription required. Calciva is a product of Avinta Digital and is built for users worldwide.
Use Calciva's EMI calculator. Enter your loan amount, annual interest rate, and tenure (months or years). Your monthly EMI, total interest payable, and amortisation schedule appear instantly. The formula is: EMI = P × r × (1+r)^n ÷ ((1+r)^n − 1), where P = principal, r = monthly rate, n = number of months.
It depends on your total deductions. If your Section 80C + 80D + HRA + other deductions exceed approximately ₹3.75 lakh, the Old Regime typically saves more tax. For lower deductions, the New Regime's flat lower rates are better. Use Calciva's income tax calculator to compare both regimes in seconds for FY 2025–26.
Yes. Calciva is designed mobile-first and is fully responsive across all screen sizes — phones, tablets, laptops, and desktops. It is retina-ready for all HiDPI screens. Many calculators also work offline once loaded on your device.
All formulas are verified by subject-matter experts and cross-referenced with authoritative sources — RBI for loan formulas, CBDT/SEBI for tax and investment, WHO for health metrics, and university standards for math and science. We update every calculator within 48 hours of any official rate change or policy update.