Free Online Calculators
Quick calculators for daily decisions: percentages and percentage change, age and date differences, BMI, discounts, tips and loan EMI. Each calculator explains the formula it uses so you can check the math.
Percentage Calculator
Calculate percentages, percentage increases, decreases, and relative fractions.
Chronological Age Calculator
Calculate exact age in years, months, days, hours, and minutes from birthdate.
Date Difference & Duration Calculator
Calculate the total days, business days, weeks, and months between two dates.
Body Mass Index (BMI) Calculator
Calculate Body Mass Index (BMI) and health category according to WHO metrics.
Retail Discount & Sale Price Calculator
Calculate final sale prices, total savings, and sales tax amounts.
Restaurant Tip & Bill Split Calculator
Calculate restaurant gratuity percentages and split bills per person.
Loan EMI & Mortgage Repayment Calculator
Calculate monthly loan EMI installments, total interest, and loan amortization.
Aspect Ratio & Resolution Calculator
Calculate image and video aspect ratios (16:9, 4:3, 1:1, 21:9) and missing dimensions.
Sales Tax & VAT Calculator
Calculate gross price, net price, and VAT / Sales Tax amounts (inclusive or exclusive).
Simple & Compound Interest Calculator
Calculate compound interest growth, annual compounding schedules, and total returns.
Client Invoice & PDF Export Generator
Fill out itemized invoice forms and download formatted PDF invoices locally.
Real-Time Global Currency Converter
Convert between USD, EUR, GBP, JPY, CAD, and 150+ global fiat currencies with cached rates.
International Bank Account Number (IBAN) Validator
Validate IBAN format, country code structure, and MOD-97 checksum compliance.
EU & UK VAT Number Syntax & Format Validator
Validate European Union and United Kingdom VAT registration number formats and checksum rules.