72 calculators available
Free Online Calculators
Every tool you need to calculate finance, health, math, and more — at your fingertips. All are 100% free and easy to use!
finance
Mortgage Calculator
Estimate monthly mortgage payments with principal, interest, taxes, and insurance breakdown.
Compound Interest Calculator
Project savings growth with compound interest and recurring contributions.
Loan Calculator
Calculate personal, auto, student, or business loan payments with amortization schedule.
Amortization Schedule Calculator
Generate a full loan amortization table with principal, interest, and balance per payment.
Mortgage Affordability Calculator
Estimate how much house you can afford using income, debts, and the 28/36 DTI rule.
Refinance Calculator
Compare your current mortgage to a refinanced loan — payment savings and break-even analysis.
APR Calculator
Calculate true Annual Percentage Rate including loan fees and finance charges.
Auto Loan Calculator
Calculate car loan payments with trade-in, sales tax, fees, and amortization schedule.
Credit Card Payoff Calculator
Project credit card payoff date, total interest, and savings vs minimum payments only.
Debt Payoff Calculator
Compare debt snowball and avalanche strategies for paying off multiple debts faster.
Salary / Paycheck Calculator
Estimate take-home pay from gross salary or hourly wage after federal taxes, FICA, and common deductions.
Sales Tax Calculator
Calculate sales tax, pre-tax price, or post-tax total. Add or remove tax bidirectionally.
Income Tax Calculator
Estimate US federal income tax, effective rate, marginal bracket, and refund or amount owed.
Tip Calculator
Calculate tip amount, total bill, and per-person split with preset percentages and optional tax.
Time Card Calculator
Calculate work hours, regular and overtime hours, and gross pay from clock in/out times.
Investment Return Calculator
Calculate total return, CAGR, and profit from starting and ending investment values over time.
Retirement Savings Calculator
Project your retirement nest egg and monthly income from savings, contributions, returns, and a safe withdrawal rate.
Savings Goal Calculator
Calculate the monthly savings needed—or time required—to reach a financial goal with interest.
Net Worth Calculator
Calculate personal net worth as total assets minus total liabilities, with category breakdowns.
VAT Calculator
Add or remove VAT from a price. Calculate net, VAT amount, and gross totals for any VAT rate.
Inflation Calculator
See how inflation changes prices and purchasing power over time using compound annual inflation.
Debt-to-Income Calculator
Calculate your debt-to-income ratio from income and monthly debts, with a CFPB-style safe, warning, or high risk band.
Emergency Fund Calculator
Find your emergency fund target from monthly expenses and see the monthly savings needed to reach 3–6 months of coverage.
Budget Planner Calculator
Plan a monthly budget across income, essential categories, and custom expenses to see exactly what's left over.
Commission Calculator
Calculate sales commission and bonus earnings across one or many sales, with an effective blended commission rate.
Payroll Calculator
Estimate employee net pay and total employer cost per pay period from gross salary, tax withholding, and deductions.
Overtime Pay Calculator
Calculate regular pay, overtime pay, and total earnings from hourly rate, hours worked, and your overtime multiplier.
Hourly Rate Calculator
Convert an annual salary into hourly, daily, weekly, and monthly pay rates based on your work schedule.
Dividend Calculator
Estimate shares owned and projected dividend income by month, quarter, or year from an investment amount and yield.
Stock Average Cost Calculator
Calculate your weighted average cost per share across multiple stock purchases, plus break-even price and unrealized profit or loss.
Dollar-Cost Averaging Calculator
Project your portfolio's future value from a starting investment plus recurring contributions at a chosen frequency and expected return.
Fuel Cost Calculator
Estimate trip fuel cost from distance, fuel economy, and price — with MPG or metric units and one-way or round-trip totals.
math
Percentage Calculator
Calculate percentages five ways: percent-of, reverse, difference, increase, and decrease.
Discount Calculator
Calculate sale price after percent or dollar discounts, with optional stacked discounts and sales tax.
Margin Calculator
Find gross margin percent and dollar profit from cost and selling price, then compare with markup.
Markup Calculator
Set product markup on cost to get selling price and convert that markup into margin percent.
Profit Margin Calculator
Analyze gross, operating, and net profit margins from revenue, COGS, and expenses.
ROI Calculator
Calculate return on investment as a percentage with optional annualized ROI and after-tax profit.
Break-Even Point Calculator
Find break-even units and revenue from fixed costs, variable cost per unit, and selling price.
Fraction Calculator
Add, subtract, multiply, divide, and simplify fractions with mixed numbers and decimal equivalents.
Scientific Calculator
Evaluate scientific expressions with PEMDAS, trig, logs, roots, and degree or radian mode.
Standard Deviation Calculator
Calculate mean, variance, and standard deviation for a dataset with population or sample mode.
Square Footage Calculator
Calculate room and floor area in square feet or square meters for rectangular and multi-room layouts.
Concrete Calculator
Estimate concrete volume for slabs, footings, and columns in cubic yards and bags needed.
Random Number Generator
Generate cryptographically strong random integers or decimals in a custom range.
Dice Roller
Roll standard RPG dice (d4–d20) or custom dice with quantity and modifiers.
Paint Calculator
Estimate how much paint you need for walls — cans, coverage with coats and waste, plus optional cost.
Mean Median Mode Calculator
Calculate the mean, median, and mode of a number set, plus range, sample standard deviation, and variance.
health
BMI Calculator
Calculate body mass index with metric or imperial units and see your BMI category.
BMR & Calorie Calculator
Estimate basal metabolic rate and daily calories (TDEE) by age, sex, height, weight, and activity.
TDEE Calculator
Calculate total daily energy expenditure (maintenance calories) from BMR, activity level, and optional body fat %.
BMR Calculator
Calculate basal metabolic rate with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formulas.
Body Fat Percentage Calculator
Estimate body fat percentage with the US Navy circumference method or a BMI-based estimate.
Ideal Weight Calculator
Estimate ideal body weight with Robinson, Miller, Devine, and Hamwi formulas plus BMI healthy range.
Pregnancy Due Date Calculator
Estimate your pregnancy due date from last menstrual period, conception date, ultrasound, or IVF transfer.
Ovulation Calculator
Estimate ovulation day and fertile window from last period date, cycle length, and luteal phase.
Sleep Calculator
Find ideal bedtimes or wake times based on 90-minute sleep cycles so you wake between cycles.
Macro Calculator
Calculate daily protein, carbohydrate, and fat targets from TDEE, activity level, and your nutrition goal.
Water Intake Calculator
Estimate daily water needs in liters and ounces from body weight, activity, climate, exercise, pregnancy, and breastfeeding.
Running Pace Calculator
Calculate running pace, speed, finish time, and even splits for 1K, 5K, 10K, half marathon, marathon, or custom distance.
Heart Rate Zone Calculator
Find training heart-rate zones 1–5 using 220−age, Tanaka, or Karvonen methods from age and resting heart rate.
Period Calculator
Estimate your next period date, fertile window, and safer days from last period start, cycle length, and period length.
education
GPA Calculator
Calculate semester GPA from credit hours and grade points on a 4.0 scale.
GPA to Percentage Calculator
Convert GPA or CGPA to percentage and back on 4.0, 5.0, and 10.0 grading scales.
Grade Calculator
Calculate your course grade from weighted assignments and see the letter grade.
Final Grade Calculator
Find the final exam score you need to reach a target course grade.
Attendance Calculator
Calculate your class attendance percentage, see how many classes you can skip, or find how many more you need to meet a required attendance threshold.
datetime
Age Calculator
Find exact age in years, months, and days between any two dates with leap-year accuracy.
Time & Date Calculator
Calculate the exact difference between two dates or count business days between dates.
Hours Calculator
Add or subtract hours and minutes, convert to decimal hours, or find the duration between two clock times.
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