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Popular: Age Calculator · BMI Calculator · Calorie Calculator · CD / APY Calculator
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Age Calculator
Find your exact age in years, months and days — plus weeks, next birthday and zodiac sign. BMI Calculator
Calculate your body mass index from your height and weight in metric or imperial units. Calorie Calculator
Daily calories to lose, maintain or gain weight, from your BMR and activity. CD / APY Calculator
CD value at maturity, interest earned, and APR-to-APY conversion. Currency Converter
Convert currencies with daily reference rates from central-bank data. Date Difference Calculator
How long between two dates — in years and months, or in plain days. GPA Calculator
Term and cumulative GPA, weighted or unweighted, on whichever scale your school uses. Loan Calculator
Monthly payment, total interest and a year-by-year breakdown for any loan. Mortgage Calculator
How mortgage payments work — principal, interest, taxes and insurance. Password Generator
Create a strong random password — choose the length and character types, copy it in one click. Paycheck Calculator
Estimate take-home pay from hourly or salary wages, W-4 choices, deductions and up to three work states. Percentage Calculator
Calculate percentages, percentage changes, and the original number in seconds. Pomodoro Timer
Focus, break, repeat — and it keeps track of where you are in the cycle. QR Code Generator
Make a QR code for a link, Wi-Fi network, phone number or email — styled, and free to download. Time Zone Converter
One moment, in every zone you care about — with the date shift named. Tip Calculator
Tip, total and an even split — including who pays the odd cent.
Find your exact age in years, months and days — plus weeks, next birthday and zodiac sign. BMI Calculator
Calculate your body mass index from your height and weight in metric or imperial units. Calorie Calculator
Daily calories to lose, maintain or gain weight, from your BMR and activity. CD / APY Calculator
CD value at maturity, interest earned, and APR-to-APY conversion. Currency Converter
Convert currencies with daily reference rates from central-bank data. Date Difference Calculator
How long between two dates — in years and months, or in plain days. GPA Calculator
Term and cumulative GPA, weighted or unweighted, on whichever scale your school uses. Loan Calculator
Monthly payment, total interest and a year-by-year breakdown for any loan. Mortgage Calculator
How mortgage payments work — principal, interest, taxes and insurance. Password Generator
Create a strong random password — choose the length and character types, copy it in one click. Paycheck Calculator
Estimate take-home pay from hourly or salary wages, W-4 choices, deductions and up to three work states. Percentage Calculator
Calculate percentages, percentage changes, and the original number in seconds. Pomodoro Timer
Focus, break, repeat — and it keeps track of where you are in the cycle. QR Code Generator
Make a QR code for a link, Wi-Fi network, phone number or email — styled, and free to download. Time Zone Converter
One moment, in every zone you care about — with the date shift named. Tip Calculator
Tip, total and an even split — including who pays the odd cent.
CategoryFinance & Money
All finance & money →
CD / APY Calculator
CD value at maturity, interest earned, and APR-to-APY conversion. Compound Interest Calculator
What savings grow to, with regular deposits and any compounding frequency. Credit Card Payoff Calculator
How long a fixed payment takes, what interest costs, and what extra payments save. Currency Converter
Convert currencies with daily reference rates from central-bank data. Loan Calculator
Monthly payment, total interest and a year-by-year breakdown for any loan. Mortgage Calculator
How mortgage payments work — principal, interest, taxes and insurance.
CD value at maturity, interest earned, and APR-to-APY conversion. Compound Interest Calculator
What savings grow to, with regular deposits and any compounding frequency. Credit Card Payoff Calculator
How long a fixed payment takes, what interest costs, and what extra payments save. Currency Converter
Convert currencies with daily reference rates from central-bank data. Loan Calculator
Monthly payment, total interest and a year-by-year breakdown for any loan. Mortgage Calculator
How mortgage payments work — principal, interest, taxes and insurance.
CategoryGenerators & Makers
All generators & makers →
Coin Flip
Flip one coin or a hundred and see every result in order. Dice Roller
Roll d4 to d100, several at once, with a modifier — fair every time. Favicon Generator
Turn one logo into a complete favicon and web-app icon package. Lorem Ipsum Generator
Placeholder text by the paragraph, sentence, word or list item — plain or as HTML. Password Generator
Create a strong random password — choose the length and character types, copy it in one click. QR Code Generator
Make a QR code for a link, Wi-Fi network, phone number or email — styled, and free to download.
Flip one coin or a hundred and see every result in order. Dice Roller
Roll d4 to d100, several at once, with a modifier — fair every time. Favicon Generator
Turn one logo into a complete favicon and web-app icon package. Lorem Ipsum Generator
Placeholder text by the paragraph, sentence, word or list item — plain or as HTML. Password Generator
Create a strong random password — choose the length and character types, copy it in one click. QR Code Generator
Make a QR code for a link, Wi-Fi network, phone number or email — styled, and free to download.
CategoryConverters & Math
All converters & math →
Fraction Calculator
Add, subtract, multiply and divide fractions, with exact answers in lowest terms. GPA Calculator
Term and cumulative GPA, weighted or unweighted, on whichever scale your school uses. Percentage Calculator
Calculate percentages, percentage changes, and the original number in seconds. Roman Numeral Converter
Convert numbers to Roman numerals and back, in either direction. Running Pace Calculator
Pace per kilometer and mile, speed, and same-pace race times. Temperature Converter
Convert Celsius to Fahrenheit and back, side by side.
Add, subtract, multiply and divide fractions, with exact answers in lowest terms. GPA Calculator
Term and cumulative GPA, weighted or unweighted, on whichever scale your school uses. Percentage Calculator
Calculate percentages, percentage changes, and the original number in seconds. Roman Numeral Converter
Convert numbers to Roman numerals and back, in either direction. Running Pace Calculator
Pace per kilometer and mile, speed, and same-pace race times. Temperature Converter
Convert Celsius to Fahrenheit and back, side by side.
CategoryHealth & Fitness
All health & fitness →
BMI Calculator
Calculate your body mass index from your height and weight in metric or imperial units. Body Fat Percentage Calculator
A circumference estimate with fat and lean mass shown separately. Calorie Calculator
Daily calories to lose, maintain or gain weight, from your BMR and activity. Due Date Calculator
Your estimated due date from your last period, conception or an IVF transfer. Ideal Weight Calculator
The healthy weight range for your height, and what the classic formulas say. Macro Calculator
Protein, carbohydrate and fat targets for your calories and your goal.
Calculate your body mass index from your height and weight in metric or imperial units. Body Fat Percentage Calculator
A circumference estimate with fat and lean mass shown separately. Calorie Calculator
Daily calories to lose, maintain or gain weight, from your BMR and activity. Due Date Calculator
Your estimated due date from your last period, conception or an IVF transfer. Ideal Weight Calculator
The healthy weight range for your height, and what the classic formulas say. Macro Calculator
Protein, carbohydrate and fat targets for your calories and your goal.
CategoryDeveloper Tools
All developer tools →
Base64 Encode & Decode
Convert text to Base64 and back, with full Unicode support. Hash Generator
MD5, SHA-1, SHA-256, SHA-384 and SHA-512 of any text, all at once. HTML Entity Encoder & Decoder
Escape HTML-sensitive text or decode named and numeric character references. JSON Formatter
Format, validate, and find out exactly where it broke. JWT Decoder
Inspect a JWT header and payload locally — without mistaking decoding for verification. Regex Tester
Test a pattern against real text — without freezing the tab.
Convert text to Base64 and back, with full Unicode support. Hash Generator
MD5, SHA-1, SHA-256, SHA-384 and SHA-512 of any text, all at once. HTML Entity Encoder & Decoder
Escape HTML-sensitive text or decode named and numeric character references. JSON Formatter
Format, validate, and find out exactly where it broke. JWT Decoder
Inspect a JWT header and payload locally — without mistaking decoding for verification. Regex Tester
Test a pattern against real text — without freezing the tab.
CategoryText & Writing
All text & writing →
Case Converter
UPPERCASE, lowercase, Title Case, Sentence case and the programmer cases. Character Counter
Characters with and without spaces, live. Remove Duplicate Lines
Delete repeated lines from a list, with optional sorting and blank-line cleanup. Text Diff Checker
Compare two versions of a text and see exactly which lines changed. Word Counter
Count words, characters, sentences, paragraphs and reading time as you type.
UPPERCASE, lowercase, Title Case, Sentence case and the programmer cases. Character Counter
Characters with and without spaces, live. Remove Duplicate Lines
Delete repeated lines from a list, with optional sorting and blank-line cleanup. Text Diff Checker
Compare two versions of a text and see exactly which lines changed. Word Counter
Count words, characters, sentences, paragraphs and reading time as you type.
CategoryBusiness & Ecommerce
All business & ecommerce →CategoryDate & Time
All date & time →
Age Calculator
Find your exact age in years, months and days — plus weeks, next birthday and zodiac sign. Business Days Calculator
Working days between two dates — your weekend, your holidays. Countdown Timer
Set it, start it, hear it — and it keeps time in a background tab. Date Difference Calculator
How long between two dates — in years and months, or in plain days. Day of the Week Calculator
Find the weekday for any past or future date. Military Time Converter
Convert military and standard time in either direction.
Find your exact age in years, months and days — plus weeks, next birthday and zodiac sign. Business Days Calculator
Working days between two dates — your weekend, your holidays. Countdown Timer
Set it, start it, hear it — and it keeps time in a background tab. Date Difference Calculator
How long between two dates — in years and months, or in plain days. Day of the Week Calculator
Find the weekday for any past or future date. Military Time Converter
Convert military and standard time in either direction.
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Isobj is a collection of free online tools — calculators, converters, generators and utilities for everyday problems. Every tool loads instantly, works on any device, and gives you the result right on the page.
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