Online Calculators | The SEO Kit

Financial Calculators

Calculate percentages, discounts, loans, and ROI

Calculate percentage, find percent, and percentage change

Calculate sale price and savings with discount percentage

Calculate monthly payments, total amount, and interest

Calculate Return on Investment percentage and profit

Personal Calculators

Calculate age, BMI, grades, and GPA

Calculate exact age in years, months, and days

Calculate Body Mass Index and health category

Calculate average grade and letter grade from scores

Calculate GPA with weighted credits

Utility Calculators

Date, time, tip, and fuel cost calculators

Add/subtract days or find days between dates

Add, subtract, and convert time durations

Calculate tips and split bills easily

Calculate trip fuel cost based on distance and efficiency

Conversion Calculators

Currency and unit conversions

Convert between major world currencies

Convert length, weight, volume, and temperature