Here is a collection of some useful free online calculators for dates, finance, business, math, and more.
Each calculator is designed to be fast, easy to use, and works right in your browser.
No downloads… No sign-ups needed!
Date and Time Calculators
Days Between Dates Calculator
Calculate the exact duration between two dates in days, weeks, months, and years.
Age Calculator
Find your exact age in years, months, and days from your birthdate.
Coming SoonBusiness Days / Working Days Calculator
Count working days between two dates, excluding weekends and optional holidays.
Coming SoonDate Add / Subtract Calculator
Find out what date is a given number of days, weeks, or months from any start date.
Coming SoonTimesheet / Hours Calculator
Enter clock-in and clock-out times to get total hours worked and overtime.
Coming SoonYears of Service / Tenure Calculator
Calculate exact years, months, and days of service from a start date to today or any end date.
Coming SoonFinance & Investments Calculators
Early Mortgage Payoff Calculator
See how extra payments can shorten your mortgage term and save you interest.
Coming SoonLoan Amortization Schedule Generator
Generate a full month-by-month amortization table with CSV and Excel download options.
Coming SoonCAGR Calculator
Calculate the Compound Annual Growth Rate for any investment or metric over time.
Coming SoonNPV Calculator
Enter a discount rate and series of cash flows to calculate the Net Present Value.
Coming SoonIRR Calculator
Enter your cash flows to find the Internal Rate of Return on any investment.
Coming SoonPresent Value / Future Value Calculator
Compute PV and FV in one tool with adjustable compound interest settings.
Coming SoonROI Calculator
Calculate Return on Investment from your cost, return, and time period.
Coming SoonBusiness Calculators
Profit Margin Calculator
Enter revenue and cost to instantly get gross and net margin percentages.
Coming SoonMarkup vs. Margin Calculator
Enter markup or margin and get the other — plus a handy conversion table.
Coming SoonSalary to Hourly / Hourly to Salary Converter
Quickly convert between annual salary and hourly wage based on your work schedule.
Coming SoonDiscount / Sale Price Calculator
Enter the original price and discount percentage to see the final price and amount saved.
Coming SoonMath and Statistics Calculators
Percentage Calculator
Multi-mode calculator — find “X% of Y”, percentage change, and percentage increase or decrease.
Coming SoonWeighted Average Calculator
Enter values and their weights to calculate the weighted average instantly.
Coming SoonStandard Deviation Calculator
Paste or enter a dataset to get the standard deviation, variance, and mean.
Coming SoonPermutation & Combination Calculator
Calculate nPr and nCr values with step-by-step working shown.
Coming SoonConfidence Interval Calculator
Enter sample mean, standard deviation, sample size, and confidence level to get the interval.
Coming SoonSample Size Calculator
Determine the ideal sample size from your confidence level, margin of error, and population size.
Coming SoonEveryday Calculators
Bill Splitter / Expense Splitter
Split a bill with tip among any number of people — supports even and uneven splits.
Coming Soon
