Free calculator tools
Fast Online Calculator
Free online calculator tools for everyday math, finance, health, time, dates, work, school, and more. Choose a calculator below and get instant results.
BMI Calculator
The BMI Calculator estimates body mass index from height and weight and places the result into a general health category.
Mortgage Calculator
The Mortgage Calculator estimates a monthly home payment using price, down payment, term, interest, taxes, and insurance.
Loan Calculator
The Loan Calculator helps estimate monthly payments, total interest, and total cost for personal or business loans.
Percentage Calculator
The Percentage Calculator answers what X% of Y is and calculates percentage increase or decrease between two values.
Calorie Calculator
The Calorie Calculator estimates daily calories based on age, gender, height, weight, activity level, and weight goal.
Age Calculator
The Age Calculator converts a date of birth into age in years, months, days, plus the next birthday countdown.
Car Loan Calculator
The Car Loan Calculator estimates monthly vehicle payments including down payment, trade-in value, interest, and term.
Interest Calculator
The Interest Calculator estimates simple or compound interest earned over time and the final account balance.
Scientific Calculator
3.0000
81.0000
729.0000
0.0900
0.1564
0.9877
0.1584
0.9542
The Scientific Calculator provides quick operations for arithmetic, square roots, powers, percent, trigonometry, and logarithms.
Unit Converter
The Unit Converter changes common weight, distance, length, and temperature values between popular units.
Tip Calculator
The Tip Calculator estimates gratuity, total bill, and each person's share when splitting a check.
BMR Calculator
The BMR Calculator estimates basal metabolic rate, or calories your body may burn at rest each day.
Credit Card Payoff Calculator
The Credit Card Payoff Calculator estimates how long repayment may take and total interest with a fixed monthly payment.
Body Fat Calculator
The Body Fat Calculator estimates body fat percentage from tape measurements using a common Navy-style formula.
Date Calculator
The Date Calculator adds or subtracts days, weeks, months, and years from a start date to find a new date.
Time Calculator
The Time Calculator finds hours and minutes between a start time and end time, including overnight spans.
Days Between Dates
Days Between Dates counts the number of calendar days between two selected dates.
Discount Calculator
The Discount Calculator calculates sale savings and final price after a percentage discount.
Sales Tax Calculator
The Sales Tax Calculator estimates tax amount and total checkout price from a price and tax rate.
Salary Calculator
The Salary Calculator converts annual salary into monthly, weekly, biweekly, and daily estimated pay.
Hourly to Salary Calculator
The Hourly to Salary Calculator turns hourly wage, weekly hours, and weeks worked into annual and periodic pay.
Average Calculator
The Average Calculator finds the mean, sum, and count for a pasted list of numbers.
Fuel Cost Calculator
The Fuel Cost Calculator estimates trip fuel expense from distance, MPG, and gas price.
MPG Calculator
The MPG Calculator finds miles per gallon from miles driven and gallons used.
Speed Calculator
The Speed Calculator divides distance by time to estimate speed.
GPA Calculator
The GPA Calculator estimates grade point average from course names, letter grades, and credit hours.
FAQ
What is an online calculator?
An online calculator is a web-based tool that quickly solves common math, finance, health, date, and school calculations.
Is this calculator free to use?
Yes. Fast Online Calculator is free to use without payment or signup.
What calculators are included?
This page includes BMI, mortgage, loan, percentage, calorie, age, car loan, tip, date, salary, GPA, and many more calculators.
Can I use this on my phone?
Yes. The page is mobile-friendly and works in modern phone, tablet, and desktop browsers.
Are the results estimates?
Yes. Results are estimates for general planning and should not replace professional financial, medical, tax, or legal advice.
Do I need to create an account?
No account is needed. You can search, choose, and use calculators instantly.