Calculators
21 daily-use calculators for percentages, dates, discounts, tips, loans, interest, grades, nutrition, taxes, retirement, and more.
Calculators are some of the most frequently used online tools. Whether you need to figure out a tip, calculate a discount, find your exact age, compare unit prices, or estimate compound interest — these situations come up constantly in daily life, school, and work.
Our calculators are designed for speed and clarity. Enter your numbers and get results instantly. Each calculator includes explanations and formulas so you understand the math behind the answer, not just the number.
Available Tools
Percentage Calculator
Calculate percentages, percent-of, and percentage change.
Age Calculator
Find your exact age in years, months, and days.
Discount Calculator
Calculate sale price and savings from any discount.
Date Difference Calculator
Find the difference between two dates.
BMI Calculator
Calculate your Body Mass Index from height and weight.
Loan Calculator
Estimate monthly payments, total interest, and total cost.
Tip Calculator
Calculate tip amount and split the bill among friends.
GPA Calculator
Calculate your cumulative GPA on a 4.0 scale.
Compound Interest Calculator
See how savings grow with compound interest over time.
Unit Price Calculator
Compare two products by price per unit to find the better deal.
Margin Calculator
Calculate profit margin and markup from cost and selling price.
Average Calculator
Calculate mean, median, mode, sum, and range from a number list.
Random Number Generator
Generate random numbers within any range.
Electricity Cost Calculator
Estimate electricity cost of running any appliance.
Scientific Calculator
Full-featured calculator with trig, log, and exponents.
Mortgage Calculator
Calculate monthly payments, total interest, and loan cost.
Fraction Calculator
Add, subtract, multiply, and divide fractions.
Final Grade Calculator
Find what grade you need on your final exam.
Calorie Calculator
Calculate BMR and TDEE for weight management.
Sales Tax Calculator
Calculate sales tax amount and total price.
Retirement Calculator
Estimate retirement savings with compound growth.
Who uses these tools?
- Families
- Students
- Freelancers
- Business owners
- Office workers
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Check out our guides and comparisons for step-by-step tutorials, implementation choices, and workflow tradeoffs related to calculators.
How to Calculate Percentage Increase and Decrease Correctly
Clear formulas and real-world examples for percentage increase, decrease, and change in business, finance, and everyday math.
How to Calculate Compound Interest
Learn the compound interest formula, the Rule of 72, and how compounding frequency affects growth. Free calculator included.
Profit Margin vs Markup — What's the Difference?
Understand the critical difference between profit margin and markup with formulas, conversion table, and industry examples.
Percentage Calculator vs Discount Calculator
General percentage math or shopping-specific sale pricing? Pick the calculator that matches the exact question you are trying to answer.
Mortgage Calculator vs Loan Calculator
Use a home-loan-focused mortgage workflow or a general loan calculator depending on whether the borrowing scenario is property-specific.