Free Online Calculators & Precision Math Tools
Every tool on India Utility Hub features deterministic calculation logic, real-time input validation, formula explanations, worked examples, assumptions, limitations, and author provenance.
Age Calculator
Exact age in years, months, days, total hours, next birthday, born day of week. (No zodiac).
Percentage Calculator
X% of Y, X is what % of Y, X is Y% of what. 3 calculation modes.
Percentage Change
Percentage increase, decrease, absolute difference, and multiplier.
Discount Calculator
Original price, discount %, tax %, final payable amount, total savings.
Date Calculator
Difference in days/weeks/months, business days counter, add/subtract days.
Time Duration Calculator
Start/End time, break minutes, total elapsed hours/minutes/seconds, decimal hours.
Unit Converter
Convert Length, Weight, Volume, Speed, Energy, and Digital Storage.
Temperature Converter
Celsius, Fahrenheit, Kelvin, and Rankine conversion with formula steps.
EMI Calculator
Monthly loan EMI, interest breakdown, and month-by-month Amortization Schedule.
Simple Interest Calculator
Principal, rate, time, simple interest, and total maturity amount.
Compound Interest
Compounding frequency (daily, monthly, quarterly, yearly) and wealth growth.
Loan Payoff Analyzer
Prepayment payoff duration reduction and interest savings.
Fuel Cost Calculator
Distance, vehicle mileage, fuel price, and per-person cost split.
Area Calculator
Square, Rectangle, Circle, Triangle, Trapezoid in Sq Ft, Sq M, Acres, Hectares.
Fraction Calculator
Add, subtract, multiply, divide fractions with step-by-step LCM solution.
Electricity Cost Estimator
Estimate appliance monthly kWh consumption and energy cost.