Financial Calculators
Mortgage payments, loans, interest, savings, retirement, taxes, and investment returns.
100+ Free Calculators · No Sign-Up Required
Every calculator
you'll ever need
Free online calculators for mortgage payments, BMI, percentages, loans, tips, and more. Trusted by millions across the US, UK, and Australia.
100+
Calculators
6
Categories
Free
Always & Forever
0
Required Sign-Ups
Calculator Categories
Find the right tool for any calculation
Health & Fitness Calculators
BMI, calories, ideal weight, pregnancy due date, basal metabolic rate, and body fat.
Math Calculators
Percentage, fractions, square roots, scientific notation, algebra, and geometry.
Date & Time Calculators
Age, days between dates, day of the week, business days, and countdown timers.
Unit Converters
Length, weight, temperature, volume, speed, and currency — all in one place.
Everyday Calculators
Tip, gas mileage, GPA, sleep, discount, concrete, and other daily-use calculators.
Most Popular Calculators
The tools millions of people search for every month
Mortgage Calculator
Financial · Monthly payment, amortization
BMI Calculator
Health · Body Mass Index
Percentage Calculator
Math · Increase, decrease, difference
Loan Calculator
Financial · Auto, personal, student loans
Age Calculator
Date & Time · Exact age in years & days
Tip Calculator
Everyday · Split bill, tip per person
Calorie Calculator
Health · Daily intake, weight loss/gain
Compound Interest Calculator
Financial · Investment growth over time
Pregnancy Due Date Calculator
Health · Due date, weeks pregnant
Salary Calculator
Financial · Hourly, weekly, annual pay
Frequently Asked Questions
Common questions about our free online calculators
How do I calculate a monthly mortgage payment?
Your monthly mortgage payment uses the formula M = P[r(1+r)ⁿ]/[(1+r)ⁿ–1], where P is loan principal, r is monthly interest rate, and n is total number of payments. For a $320,000 loan at 6.5% for 30 years, that's roughly $2,023/month. Use our mortgage calculator to run the numbers instantly with your exact figures.
What is a healthy BMI range for adults?
According to the CDC, a healthy BMI for adults is between 18.5 and 24.9. Under 18.5 is underweight; 25–29.9 is overweight; 30 and above is obese. BMI is calculated as weight (lbs) × 703 ÷ height (inches)². Try our BMI calculator for your result in seconds.
How do you calculate a percentage increase or decrease?
Percentage change = ((New – Old) / Old) × 100. For example, a salary going from $60,000 to $66,000 is a 10% increase. Our percentage calculator handles increases, decreases, percentage of a number, and more — just choose your scenario.
How much should I tip at a restaurant in the US?
The standard in the United States is 15–20% for good service, with 20–25% for exceptional service. On a $80 dinner bill, a 20% tip is $16. Use our tip calculator to split the tip and total evenly between your group with one tap.
Are all calculators on this site really free?
Yes — 100% free, forever. No account needed, no premium tier, no hidden paywalls. Every single calculator is free to use on any device, as many times as you like.