Calculate Anything. Anytime.
Free online calculators for finance, education, health, business and everyday life. All calculations run directly in your browser.
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Popular Calculators
The most frequently used tools by professionals, students, and homeowners.
Age Calculator
Find exact age in years, months and days from a date of birth.
Date Difference Calculator
Measure the gap between two dates in years, months, weeks and days.
Percentage Calculator
Find what percent one number is of another.
Discount Calculator
Apply one or several sequential discounts to a price.
Home Loan EMI
Estimate monthly home-loan instalments, interest and a repayment schedule.
Personal Loan EMI
Unsecured-loan instalment estimate with amortization.
GST Add Calculator
Add GST to a taxable amount and preview CGST/SGST halves.
In-Hand Salary
Estimate take-home pay from basic, HRA, allowances and deductions you enter.
Calculator Categories
Every tool grouped into 12 dedicated disciplines.
Age and Date
Ages, date gaps, working days, leap years and countdowns.
Percentage and Discount
Percentages, discounts, reverse percentages, profit and loss.
EMI and Loans
EMI, interest, amortization, eligibility estimates and comparisons.
GST
Add or remove GST and split CGST, SGST or IGST.
Salary
CTC, in-hand pay, overtime, increments and gratuity estimates.
Time and Working Hours
Shift length, timesheets, overtime and time arithmetic.
Unit Converters
Length, weight, temperature, area, volume, speed, data, time, pressure and power.
Currency
Worldwide converter powered by a live currency catalogue.
Health and Fitness
BMI, calorie estimates, ideal weight, water intake and running pace.
Education
GPA, CGPA, attendance and exam score planning.
Construction
Concrete, paint, tiles, area and brick quantity estimates.
Vehicle
Fuel cost, mileage and trip cost estimates.
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Featured Tools
Hand-picked calculators with visual charts and detailed breakdown tables.
Age Calculator
Find exact age in years, months and days from a date of birth.
Percentage Calculator
Find what percent one number is of another.
Home Loan EMI
Estimate monthly home-loan instalments, interest and a repayment schedule.
Compound Interest
Compounded growth with a frequency you choose.
Currency Converter
Convert amounts using a live worldwide currency catalogue and published rates.
Gold Rate Calculator
Calculate gold rate per 1 gram, 8g sovereign, 10g or tola across 24K, 22K, 18K and 14K purities with making charges and GST.
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Calculation Guides & Formulas
Clear, step-by-step mathematical explanations to help you understand every formula.
How to calculate a percentage
Turn a part and a whole into a percentage, and convert a percentage back into a value.
How to calculate EMI
Understand the reducing-balance instalment formula used by OmniCalc loan tools.
How GST is calculated
Inclusive versus exclusive prices, and why CGST/SGST/IGST splits are assumptions.
Frequently Asked Questions
Everything you need to know about how OmniCalc works.
Is OmniCalc free to use?
Yes, OmniCalc is 100% free with unlimited calculations. There are no premium paywalls, account registrations, or hidden fees.
Does OmniCalc store my private financial or personal numbers?
No. Unlike other calculator portals, all arithmetic equations run entirely inside your browser. Your numeric entries are never transmitted to a server or stored in a database.
Where do foreign exchange rates come from?
Currency conversion rates are dynamically retrieved via the official Frankfurter v2 API, which publishes reference rates established by the European Central Bank. No currency rates are hardcoded.
Can I use OmniCalc on mobile devices?
Yes. OmniCalc is fully responsive and optimized for touch interactions on smartphones, tablets, and desktop workstations.
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