Math12 tools
Calculators for everyday numbers — percentages, dates, health, money and more.
- Calculator
- Percentage Calculator
- Date Calculator
- Age Calculator
- BMI Calculator
- Tip Calculator
- Salary Calculator
- GPA Calculator
ETA CalculatorCalculate estimated time of arrivalCalculatorSimple and scientific calculatorPercentage CalculatorCalculate percentages easilyAge CalculatorCalculate your exact age in years, months, and daysBMI CalculatorCalculate your Body Mass Index and understand your health statusCalorie CalculatorEstimate your daily calorie needs and macronutrient breakdownDate CalculatorCalculate distance between dates or project future deadlinesFraction CalculatorPerform arithmetic operations on fractions with simplified resultsGPA CalculatorTrack your grades and see your weighted or unweighted GPASalary CalculatorCalculate and convert your salary across different pay periodsTip CalculatorSplit bills and calculate tips instantly for dining and servicesZakat CalculatorCalculate your obligatory charity based on your current wealth
About math
Quick, accurate calculators that show their working: percentages and percentage change, dates and ages, BMI and calorie needs, GPA, salary and tip splitting, fractions, ETA and elapsed time, and a scientific expression evaluator.
All calculations run in your browser and update as you type — no page reloads, no ads between you and the answer.
Frequently asked questions
- Can I trust these calculators for important decisions?
- They use standard formulas and are accurate for everyday use. For medical, legal or tax decisions, treat the results as a starting point and confirm with a professional.