All Calculators
Browse our complete collection of free online calculators
Conversion
Base Calculator
Convert numbers between binary, octal, decimal, hexadecimal, and any base from 2 to 36
Base Converter
Convert whole and fractional numbers from any base to any base (2-36), with step-by-step division and multiplication working
Binary to Decimal Converter
Convert binary to decimal with a place-value breakdown, two's complement signed values, and fractional binary support
Binary Calculator
Add, subtract, multiply, divide, and AND/OR/XOR binary numbers, with results in binary, decimal, and hex
Binary to Hexadecimal Converter
Convert binary to hexadecimal by grouping bits into nibbles, with a step-by-step nibble table and fractional binary support
Developer Tools
Encoding
Finance
Compound Interest Calculator
Calculate compound interest on your investments with our free online calculator
Mortgage Calculator
Calculate monthly mortgage payments, amortization, and total interest with our free calculator
Amortization Calculator
Generate a full loan amortization schedule and see your monthly payment, total interest, and payoff timeline
APR Calculator
Calculate the true annual percentage rate (APR) of a loan, including origination fees and other upfront charges
APR to APY Calculator
Convert between APR (annual percentage rate) and APY (annual percentage yield) for any compounding frequency
APY Calculator
Calculate annual percentage yield and see how a deposit grows, plus compare yields across compounding frequencies
CD Calculator
Calculate the maturity value and total interest earned on a certificate of deposit
CD Ladder Calculator
Split an investment across multiple CDs with staggered terms and see each rung's maturity value plus the total return
Credit Card Interest Calculator
Calculate the interest charged on your credit card balance for a billing cycle using the daily periodic rate method
Credit Card Payoff Calculator
Calculate how many months it will take to pay off a credit card balance with a fixed monthly payment, plus total interest paid
Daily Compound Interest Calculator
Calculate how a lump sum grows with daily compounding interest, plus optional recurring deposits, with a full growth breakdown
EAR Calculator
Calculate the Effective Annual Rate (EAR) of a nominal interest rate, and compare it across compounding frequencies
Future Value Calculator
Calculate the future value of an investment with an initial deposit, regular contributions, and compound interest
Interest Calculator
Calculate simple or compound interest on a deposit or loan, and compare both side by side
Interest Rate Calculator
Find the interest rate on a fixed-term loan from the loan amount, term, and monthly payment
Loan Interest Calculator
Calculate the total interest on a loan, how it splits across each year, and how the loan term changes what you pay
Loan Payment Calculator
Calculate the payment on a fixed-rate loan at any payment frequency, with total interest and a full payment schedule
Loan Payoff Calculator
See how long it will take to pay off a loan at your current payment, and how much time and interest extra payments save
Health & Fitness
BMI Calculator
Calculate your Body Mass Index (BMI) from height and weight and see your weight category
Adjusted Body Weight Calculator
Calculate adjusted body weight (AdjBW) from ideal body weight and actual weight, used for medication dosing in obesity
Army Body Fat Calculator
Estimate body fat percentage with the U.S. Army circumference tape-test method and compare it to Army max body-fat standards by age and sex
Baby Growth Percentile Calculator
Find your baby's weight, length, and head circumference percentiles from birth to 24 months using the WHO growth standards
Blood Alcohol Content (BAC) Calculator
Estimate blood alcohol content from your drinks, weight, sex, and time using the Widmark formula, with a BAC-over-time chart and time until sober
Body Fat Calculator
Estimate your body fat percentage with the U.S. Navy tape-measure method, plus fat mass, lean mass, and your ACE category
Body Shape Calculator
Find your body shape from bust, waist, high hip, and hip measurements using the FFIT classification, plus your waist-to-hip ratio
Math
Basic Calculator
A simple online calculator for everyday addition, subtraction, multiplication, and division with a running calculation history
Scientific Calculator
A full scientific calculator with trigonometric, logarithmic, exponential, and expression evaluation, honoring standard order of operations
Decimal to Percent Calculator
Convert any decimal number to a percentage instantly, with negative numbers and values over 100% supported
Percent Change Calculator
Calculate the percentage increase or decrease between two values
Percent Decrease Calculator
Calculate the percentage decrease between two values, or find the reduced or original value from a percent off
Percent Error Calculator
Calculate the percent error between measured and accepted values, for a single measurement or a full set of trials
Percent Difference Calculator
Calculate the percentage difference between two values relative to their average
Percent Increase Calculator
Calculate the percentage increase between two values, or find the increased or original value from a percent increase
Percent of a Percent Calculator
Find a percent of a percent by multiplying two or more percentages, optionally applied to a starting value
Percent to Decimal Calculator
Convert any percentage to a decimal instantly, plus its simplified fraction, per mille, and basis points