Free Online Calculators — BMI, Age, Percentage, GPA & More
💡 Usage Tips
- • Age Calculator: Calculate exact age in years, months, days
- • Date Difference: Find difference between any two dates
- • Working Days: Count business days excluding weekends
- • Countdown: Track time remaining to important events
- • Timezone: Convert times across different time zones
How to Use Free Online Calculators for Health, Math and Finance
- Open ToolzBank Calculators. Go to toolzbank.com/calculators in any web browser. No app download is needed.
- Select your calculator category. Choose from three categories: Health & Fitness (BMI, BMR & calories, blood count ranges, vital signs, bone density, water intake), Math & Finance (percentage, GPA, area, unit price), or Date & Time (age, date difference, working days, countdown, time zones).
- Enter your values. Fill in the required fields. For example, enter your weight and height for BMI, or your date of birth for the age calculator.
- Get instant results. Results are calculated instantly as you type, with clear breakdowns for multi-step calculations like GPA and BMR/calorie needs.
Frequently asked questions
How do I calculate BMI online?
Go to toolzbank.com/calculators/bmi (or the Health & Fitness page). Enter your weight (kg or lbs) and height (cm or ft/in) in the BMI calculator. Your BMI is calculated instantly along with your weight category (Underweight, Normal, Overweight or Obese).
How do I calculate my BMR and daily calorie needs?
Go to toolzbank.com/calculators/health-fitness and open BMR & Calories. Enter your age, sex, height, weight and activity level. It instantly shows your Basal Metabolic Rate (BMR), maintenance calories (TDEE) and calorie goals for weight loss or gain.
How do I calculate my age from my date of birth?
Go to toolzbank.com/calculators/date-time and open the Age Calculator. Enter your date of birth. It instantly shows your exact age in years, months and days.
How do I calculate percentage online?
Go to toolzbank.com/calculators/math-finance and use the Percentage calculator. Enter your two values (e.g. what is X% of Y, or X is what % of Y) and the result is shown instantly.
How do I calculate my GPA online?
Go to toolzbank.com/calculators/math-finance and open the GPA Calculator. Add each course with its grade and credit hours, and your overall GPA is calculated instantly.
How do I calculate the difference between two dates?
Go to toolzbank.com/calculators/date-time and use the Date Difference calculator by entering a start date and end date. It shows the exact difference in years, months and days.
How do I calculate working days between two dates?
Go to toolzbank.com/calculators/date-time and open Working Days. Enter a start and end date and it counts business days, excluding weekends, between them.
Are the ToolzBank calculators free?
Yes, all calculators on ToolzBank are completely free to use. All calculations happen instantly in your browser.
Does ToolzBank have a prayer times calculator?
Yes. Go to toolzbank.com/calculators/prayer-times for today's Fajr, Dhuhr, Asr, Maghrib and Isha prayer times, plus the Hijri date, for Karachi, Lahore, Islamabad and other major cities worldwide.
How accurate are the ToolzBank calculators?
ToolzBank calculators use standard formulas for all calculations — BMI uses the WHO formula, and BMR uses the standard Mifflin-St Jeor equation. Results are accurate for general use; for medical or financial decisions, consult a qualified professional.
From Our Blog
How to Check Accurate Prayer Times for Any City Online
Fajr, Dhuhr, Asr, Maghrib and Isha times shift every day and vary by city and calculation method. Here is how to check them accurately, for free.
How to Calculate Working Days Between Two Dates
How a working days calculator excludes weekends to give you an accurate business-day count for deadlines, shipping estimates and project planning.
How to Use a Unit Price Calculator to Shop Smarter
Why the bigger pack isn't always the better deal, how unit price actually works, and how to compare two products in seconds instead of doing mental math in the aisle.
How to Calculate the Area of Common Shapes Online
The area formulas for squares, rectangles, triangles and circles, explained with examples — and how to calculate any of them instantly without doing the math by hand.
How to Calculate Your GPA Online
How GPA is actually calculated from grades and credit hours, why two students with the same grades can have different GPAs, and how to calculate yours in seconds.
Blood Count Ranges, Vital Signs and Bone Density: What Your Numbers Mean
A plain-English guide to reading your hemoglobin, white and red blood cell counts, platelets, heart rate, respiratory rate, and bone density T-score — and where the normal ranges come from.