Everyday Calculators
8 free tools · Fast answers for everyday math: percentages, dates, grades, tips and health.
Percentage Calculator
Three percentage calculators in one: percent of a number, percent ratio and percent change.
Tip Calculator
Work out the tip, total and each person's share in seconds.
Namaz & Qaza Calculator
Count every prayer since the age of obligation, including Jumu'ah, both Eids and Ramadan fasts, and plan your qaza prayers.
GPA Calculator
Add your courses, grades and credit hours to calculate your GPA on a 4.0 scale, including cumulative GPA.
Date Calculator
Count the days between two dates or add and subtract days, weeks and months from any date.
Calorie Calculator
Estimate how many calories you burn per day and how much to eat to lose, maintain or gain weight.
Age Calculator
Find an exact age in years, months and days, plus a countdown to the next birthday.
BMI Calculator
Calculate body mass index in imperial or metric units and see your healthy weight range.
Everyday answers in seconds
From splitting a restaurant bill to checking a GPA or counting the days until a deadline, these calculators answer common questions instantly as you type. Each one shows how the answer is worked out, so they are also handy for homework and checking your own math.
| Question | Calculator |
|---|---|
| What is 15% of 80? How much did it change? | Percentage Calculator |
| How old am I exactly? Days until my birthday? | Age Calculator |
| How many days between two dates? | Date Calculator |
| What's my semester or cumulative GPA? | GPA Calculator |
| How much should I tip and split? | Tip Calculator |
| Is my weight healthy? How many calories do I need? | BMI & Calorie Calculators |
| How many prayers since puberty? | Namaz & Qaza Calculator |
Frequently asked questions
Do these calculators work on my phone?
Yes. Every calculator is designed for phones first, with large inputs and sliders, and works offline once the page has loaded.
Is my data saved?
No. Calculations happen on your device; nothing you type is sent to our servers.