Free Online Calculators – Math, Finance & Everyday Tools
Easy-to-use online calculators. Calculate percentages, age, discounts, and math equations instantly without any registration.
Age Calculator
Determine your exact chronological age in years, months, and days, along with a total lifetime breakdown in weeks and days.
Aspect Ratio Calculator
Calculate image dimensions and find aspect ratios instantly.
Date Duration Calculator
Calculate the exact number of days, weeks, months, and years between two dates. Perfect for planning and tracking events.
Discount Calculator
Calculate the final price after discount instantly. Supports double discounts and tax calculation.
Loan Calculator
Calculate your monthly loan payments, total interest, and amortization. Perfect for mortgages, auto loans, and personal loans.
Pipe Velocity Calculator
Calculate fluid velocity and flow rate in pipes based on diameter. Essential for plumbing and engineering.
Fuel Cost Calculator
Calculates trip fuel cost and cost per passenger from distance, consumption, and fuel price.
EV Trip Cost Calculator
Calculate the electricity cost for your electric vehicle trip. Compare your savings against traditional gas cars.
Electricity Cost Calculator
Estimate an appliance's electricity cost from its wattage, daily usage hours, and your price per kWh.
Cat Age Calculator
Converts a cat's age to its human equivalent, shows the AAHA life stage, and reverse-converts human years to cat years.
Dog Age Calculator
Converts dog age to human years by size class, shows life stage and typical life expectancy, and turns a human age back into dog years.