Free Online Calculators
Need to crunch a number — fast? Enodum’s calculator collection gives you instant, accurate answers without spreadsheets, sign-ups, or sketchy ad-heavy sites. Whether you’re planning a mortgage, tracking your BMI, splitting a dinner bill, or helping a student calculate their GPA, the right tool is one click away.
Every calculator on this page runs directly in your browser: nothing to download, nothing to install, and no data ever leaves your device. We publish the formulas behind each tool so you can verify the math yourself, and every page loads in under a second thanks to static generation.
Browse by category below, or use the search to find the exact calculator you need. 52+ tools and counting — all free, all the time.
Daily Life Calculators
Handle everyday calculations — tips, age, date differences, cooking conversions, and time math — all in seconds. — 5 tools
Age Calculator
Calculate your exact age in years, months, weeks, and days from your birthday. Free age calculator for any past or future date.
Cooking Measurement Converter
Convert cooking measurements between cups, tablespoons, teaspoons, and milliliters. Free kitchen conversion calculator for recipes.
Date Difference Calculator
Find the number of days, weeks, and months between two dates. Free date duration calculator for planning projects, events, and deadlines.
Time Calculator
Add or subtract durations in hours and minutes, and convert between hours, minutes, and seconds. Free time calculator for timesheets and schedules.
Tip Calculator
Quickly calculate the tip and total bill, then split it among any number of people. Free tip calculator for restaurants, delivery, and groups.
Finance Calculators
Plan your financial future with mortgage, loan, investment, tax, and salary calculators — instant estimates for every money question. — 28 tools
Amortization Calculator
Generate a complete amortization breakdown for any loan. See principal vs interest split and total cost over the life of the loan.
Auto Loan Calculator
Estimate your monthly car payment and total loan cost. Free auto loan calculator that accounts for down payment, trade-in, and sales tax.
Currency Converter
Convert amounts between two currencies using a custom exchange rate. Free currency converter for travel, shopping, and international business.
Fuel Cost Calculator
Calculate how much you will spend on gas for any trip or commute. Free fuel cost calculator using distance, MPG, and fuel price.
Interest-Only Mortgage Calculator
Calculate the monthly payment on an interest-only mortgage and the payment shock when it converts. Free IO mortgage calculator.
Investment Calculator
Estimate how your investments grow with compound interest and regular contributions. Free investment calculator for retirement, stocks, and long-term planning.
Loan Calculator
Calculate monthly payments, total interest, and payoff schedule for any personal loan. Free loan calculator with amortization and total cost breakdown.
Mortgage Calculator
Calculate your monthly mortgage payment including taxes, insurance, and PMI. Free mortgage calculator with amortization schedule and affordability analysis.
Paycheck Calculator
Estimate your net paycheck after taxes and deductions. Free paycheck calculator for hourly and salaried employees with withholdings.
Refinance Calculator
See if refinancing your mortgage makes sense. Free refinance calculator comparing your current and new monthly payments, closing costs, and break-even point.
Retirement Calculator
See if you are on track for retirement. Estimate your nest egg from current savings, contributions, and returns with this free retirement calculator.
Salary Calculator
Convert between hourly wage, annual salary, and monthly income. Free salary calculator that accounts for hours per week and vacation time.
Simple Interest Calculator
Compute simple interest using I = Prt. Free simple interest calculator for short-term loans, bonds, and basic finance problems.
Income Tax Calculator
Quickly estimate your income tax based on gross income and a flat effective rate. Free tax calculator for budgeting and paycheck planning.
Used Car Loan Calculator
Estimate monthly payments on a used car loan. Free used car loan calculator.
Gas Cost Calculator
Calculate the cost of gas for any trip. Free gas cost calculator.
401(k) Calculator
Project your 401(k) balance with employer match. Free 401k retirement calculator.
Roth IRA Calculator
Project Roth IRA growth with after-tax contributions. Free Roth IRA calculator.
Stock Return Calculator
Calculate total return on a stock investment. Free stock return calculator.
Debt Consolidation Calculator
See how much you could save by consolidating multiple debts. Free debt consolidation calculator.
Business Loan Calculator
Calculate monthly payments on a business loan. Free business loan calculator for small and mid-size companies.
Personal Loan Calculator
Estimate monthly payments on a personal loan. Free personal loan calculator with total interest breakdown.
Car Loan Calculator
Calculate your monthly car payment and total loan cost. Free car loan calculator for new and used vehicles.
FHA Loan Calculator
Calculate FHA loan monthly payments with a low 3.5% down payment. Free FHA mortgage calculator with MIP estimates.
VA Loan Calculator
Estimate your VA loan monthly payment with zero down payment and no PMI. Free VA loan calculator for veterans.
Home Affordability Calculator
Find out how much house you can afford based on your income and down payment. Free affordability calculator.
Jumbo Loan Calculator
Calculate monthly payments on a jumbo loan for high-value homes. Free jumbo mortgage calculator.
Hourly Paycheck Calculator
Estimate take-home pay from an hourly wage. Free hourly paycheck calculator.
Health Calculators
Track your fitness and wellness with BMI, body fat, calorie, sleep, and pregnancy calculators — evidence-based formulas, no sign-up. — 9 tools
BMI Calculator
Calculate your Body Mass Index (BMI) instantly with metric or imperial units. Free BMI calculator with healthy weight range and category guidance.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy circumference method. Free body fat calculator for men and women with fitness category guidance.
Calorie Calculator
Estimate your daily calorie needs using the Mifflin-St Jeor equation. Free calorie calculator for BMR, TDEE, and weight-loss or gain goals.
Due Date Calculator
Estimate your baby's due date and current pregnancy week using the first day of your last menstrual period. Free due date calculator.
Ovulation Calculator
Predict your ovulation day and fertile window from your last period. Free ovulation calculator for conception and cycle tracking.
Protein Calculator
Estimate your daily protein needs in grams based on weight, activity, and goal. Free protein intake calculator with TDEE and macro split.
Sleep Calculator
Find your ideal bedtime or wake-up time based on 90-minute sleep cycles. Free sleep calculator so you wake up refreshed, not groggy.
BMI Calculator for Women
Calculate BMI tailored for women with healthy weight ranges. Free female BMI calculator.
Weight Loss Calorie Calculator
Find the daily calorie target for sustainable weight loss. Free weight loss calorie calculator.
Math Calculators
Solve quick math problems with percentage, discount, and GPA calculators — no need to open a spreadsheet. — 4 tools
Discount Calculator
Find the final price after any discount or coupon. Free discount calculator that shows sale price, amount saved, and tax-inclusive total.
GPA Calculator
Calculate your semester or cumulative GPA on a 4.0 scale. Free GPA calculator that weights courses by credit hours.
Percentage Calculator
Calculate a percentage of a number, or find what percent one number is of another. Free percentage calculator for discounts, tips, and stats.
Black Friday Calculator
See real savings on Black Friday deals. Free Black Friday discount calculator.
Science Calculators
Convert units and explore scientific constants with tools built on SI and NIST reference data. — 6 tools
Area Converter
Convert between common area units — square feet, square meters, acres, hectares, square miles, square yards. Free area unit converter.
Length Converter
Convert between metric and imperial length units — meters, feet, inches, miles, kilometers, centimeters, millimeters. Free length unit converter.
Speed Converter
Convert between common speed units — mph, km/h, m/s, knots, feet per second. Free speed (velocity) unit converter.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin. Free temperature converter with the exact mathematical relationships for all six conversions.
Volume Converter
Convert between metric and imperial volume units — liters, milliliters, US gallons, quarts, pints, cups, fluid ounces. Free volume unit converter.
Weight Converter
Convert between metric and imperial weight units — kilograms, pounds, ounces, grams, milligrams, stones. Free weight (mass) unit converter.