Free Online Calculators & Converters
Fast, accurate calculators for everyday life — health, money, dates, grades and unit conversions. Every tool is free, runs privately in your browser, and shows its formula.
Age Calculator
Work out your exact age in years, months and days — or anyone else's — from a date of birth.
Days Between Dates
Count the exact number of days, weeks and business days between any two dates.
BMI Calculator
Check your Body Mass Index in metric or imperial units and see which category you fall into.
Calorie & TDEE Calculator
Estimate daily calories from the Mifflin-St Jeor equation, with targets for losing, maintaining or gaining weight.
Tip Calculator
Split a restaurant bill fairly — tip amount, total and per-person cost in seconds.
Loan / EMI Calculator
Monthly payment, total interest and an amortisation summary for any personal, car or student loan.
Mortgage Calculator
Monthly principal and interest from home price, down payment, rate and term.
Compound Interest Calculator
See how savings grow with compound interest and optional monthly contributions.
Percentage Calculator
Percentages of numbers, percentage change, and 'what percent is X of Y' — all modes in one tool.
GPA Calculator
Convert your course grades and credit hours into a weighted GPA on the 4.0 scale.
CM to Inches Converter
Convert centimetres to inches instantly, with a full 1–100 conversion table.
Meters to Feet Converter
Convert metres to feet (and feet plus inches) with a 1–100 reference table.
KM to Miles Converter
Kilometres to miles for driving distances, races and travel, with a 1–100 table.
KG to Pounds Converter
Kilograms to pounds for body weight, luggage and gym plates, with a 1–100 table.
Celsius to Fahrenheit Converter
Convert °C to °F for weather, cooking and travel, with a −40 to 100 table.
Why use our calculators?
EverydayCalcs exists for the small numerical questions that come up again and again in daily life: How old am I exactly? How many days until that deadline? What will this loan really cost me each month? How many calories should I actually be eating? Each tool on this site is built around one of those questions and answers it instantly, in your browser, with no sign-up, no download and no cost.
Three things set these calculators apart. First, transparency: every page shows the exact formula it uses and a worked example you can check by hand, so you never have to trust a black box. Second, privacy: all arithmetic happens on your own device using JavaScript — the numbers you type are never sent to a server, logged, or stored. Third, accuracy: the tools use the same standard formulas used by professionals, from the Mifflin-St Jeor equation for calorie needs to the standard amortisation formula for loan payments.
Whether you are planning a budget, tracking your health, splitting a dinner bill, helping a student work out their GPA, or converting units for a trip abroad, you will find a focused tool here. Bookmark the ones you use often — and if a calculation looks wrong, tell us via the contact page and we will fix it.