Free online calculators, instant answers
CalcHub is a growing collection of 32 fast, accurate calculators and converters for money, health, math, dates, and units. Everything is free and works without an account.
Finance
View all →Loan Payment Calculator
Calculate your monthly loan or mortgage payment from the loan amount, interest rate, and term. See total interest paid over the life of the loan.
Mortgage Calculator
Calculate your monthly mortgage payment and see the full payoff schedule. Add an extra monthly payment to see how many years and how much interest you save.
Compound Interest Calculator
See how your savings grow with compound interest. Calculate the future value of an investment with an initial deposit, monthly contributions, and annual return.
Salary to Hourly Calculator
Convert between annual salary and hourly wage instantly. See equivalent monthly, weekly, and daily pay based on your hours per week.
Tip Calculator
Quickly calculate the tip and total bill, and split it evenly between any number of people. Includes common tip percentages.
Discount Calculator
Calculate the final price after a percentage discount and see exactly how much you save. Supports stacked second discounts.
Savings Goal Calculator
Find out how much you need to save every month to reach a financial goal, accounting for what you already have and the interest it earns.
Credit Card Payoff Calculator
See how long it takes to pay off a credit card balance at a fixed monthly payment, the total interest cost, and how a larger payment shortens the timeline.
Sales Tax Calculator
Add sales tax or VAT to a price, or work backward from a tax-inclusive total to find the pre-tax price and the tax amount.
Health
View all →BMI Calculator
Calculate your Body Mass Index (BMI) from height and weight in metric or imperial units, and see which BMI category you fall into.
Calorie & BMR Calculator
Calculate your Basal Metabolic Rate (BMR) and daily calorie needs based on age, sex, height, weight, and activity level.
Ideal Weight Calculator
Estimate your ideal body weight from height and sex using the Devine and Robinson formulas, plus the healthy BMI weight range.
Body Fat Calculator
Estimate your body fat percentage from height, neck, waist, and hip measurements using the US Navy circumference method, with fitness categories.
Pregnancy Due Date Calculator
Calculate your estimated due date from the first day of your last period, see how many weeks pregnant you are, and when each trimester starts.
Running Pace Calculator
Calculate your running pace per kilometer and per mile from any distance and time, plus projected finish times for 5K, 10K, half, and full marathon.
Math
View all →Percentage Calculator
Calculate percentages three ways: what is X% of Y, what percent X is of Y, and the percentage change between two numbers.
Average Calculator
Calculate the mean, median, sum, and count of any list of numbers. Paste or type values separated by commas, spaces, or new lines.
Standard Deviation Calculator
Calculate the standard deviation and variance of a data set, both sample and population versions, along with the mean.
Ratio Calculator
Solve the missing value in a proportion (A:B = C:D) and simplify any ratio to its lowest terms. Useful for scaling recipes, maps, and mixtures.
Fraction to Decimal Converter
Convert any fraction to a decimal and percentage, and see the fraction in lowest terms. Works with improper fractions too.
Date & Time
View all →Age Calculator
Calculate your exact age in years, months, and days from your date of birth, plus total days lived and days until your next birthday.
Days Between Dates Calculator
Count the exact number of days between two dates, including or excluding the end date, with the result also shown in weeks, months, and years.
Add or Subtract Days from a Date
Add or subtract days, weeks, or months from any date to find the resulting calendar date. Ideal for deadlines, notice periods, and due dates.
Business Days Calculator
Count the business days (Monday to Friday) between two dates. Useful for delivery estimates, contract deadlines, and payroll periods.
Time Duration Calculator
Calculate the hours and minutes between two clock times, including overnight shifts, with the result also shown as decimal hours for timesheets.
Converters
View all →Length Converter
Convert between metric and imperial length units: millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Weight Converter
Convert between kilograms, grams, pounds, ounces, and stone. Instant, accurate metric–imperial weight conversion.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin with exact formulas. Includes common reference points.
Speed Converter
Convert speeds between kilometers per hour, miles per hour, knots, meters per second, and feet per second.
Area Converter
Convert areas between square meters, square feet, square yards, acres, hectares, square kilometers, and square miles.
Volume Converter
Convert volumes between liters, milliliters, US gallons, cups, fluid ounces, tablespoons, and teaspoons. Ideal for cooking and recipes.
Data Storage Converter
Convert between data units: bytes, kilobytes, megabytes, gigabytes, terabytes, and their binary counterparts (KiB, MiB, GiB, TiB).