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❤️ Health & fitnessFree
Calculate macronutrient split from calories and percentages
Turn a calorie goal into grams you can plan meals around: 2,000 calories split 30% protein, 40% carbohydrates and 30% fat gives 150 g, 200 g and 66.666667 g.
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❤️ Health & fitnessFree
Estimate one-rep max with the Epley formula
Estimate your single-lift maximum without attempting it: 100 lifted for 5 repetitions gives an Epley estimate of 116.66666666666667 in the same unit you…
K
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💰 Finance & moneyFree
Calculate overtime pay from hourly rate, hours, and multiplier
See regular, overtime and total pay side by side: 40 hours at 24.5 plus 6 overtime hours at 1.5 times the rate gives 980 regular, 220.5 overtime and 1,200.5 in…
F
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❤️ Health & fitnessFree
Convert running pace to speed
Know how fast your pace really is: 5 minutes per kilometer is 12 km/h, or 7.456454 mph, and it works the other way round for treadmill speeds.
K
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➗ MathFree
Calculate percentage change
Measure how much something moved against where it started: going from 80 to 100 is a rise of 20, a 25% increase, labeled as such so the direction is never in…
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➗ MathFree
Calculate percentage of an amount
Get the share itself in one step: 18% of 250 is 45, and the reverse question works too, since 45 out of 180 is 25%.
R
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➗ MathFree
Simplify and scale a ratio
Simplify a ratio and share out a total in one go: 18:24 reduces to 3:4, and with a total of 140 each of the seven parts is worth 20, so the first term receives…
R
Runs in your browser
💰 Finance & moneyFree
Retirement savings future value calculator
See what steady saving could add up to: 50,000 today plus 500 a month at 7% for 30 years projects 1,015,810.37, of which 230,000 is your own money and…
F
Runs in your browser
💰 Finance & moneyFree
Calculate pre-tax price from total
Recover the price before tax from a total that already includes it: 107.25 at a 7.25% rate splits into 100 before tax and 7.25 of tax, found by dividing by…
F
Runs in your browser
💰 Finance & moneyFree
Convert salary to hourly rate
Put a salary and an hourly offer on the same footing: 62,400 a year at 40 hours a week works out to 30 an hour, using 52 weeks, or 2,080 paid hours.
R
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💰 Finance & moneyFree
Calculate price with sales tax
Know what a purchase will really cost once tax is added: a price of 80 at a 7.5% rate carries 6 in tax, for a total of 86, with both figures shown separately.
F
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💰 Finance & moneyFree
Calculate time to reach a savings goal with monthly contributions
Put a finish date on your savings target: with 2,500 saved, 500 added each month and a goal of 10,000, the remaining 7,500 takes 15 months, or 1 year and 3…
F
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💰 Finance & moneyFree
Calculate simple interest
Find the interest and the final amount when interest never compounds: 1,250 at 4.8% a year for 2.5 years earns 150, for a final amount of 1,400.
F
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❤️ Health & fitnessFree
Estimate body frame size from height and wrist measurement
Find your frame size from two tape measurements: 175 cm tall with a 17.5 cm wrist gives a ratio of 10, a medium frame.
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❤️ Health & fitnessFree
Calculate calories from macros
Add up the calories behind your macro targets: 150 g of protein, 250 g of carbohydrates and 70 g of fat come to 2230 kcal, split into 600, 1000 and 630 so you…
K
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💰 Finance & moneyFree
Price ladder calculator
Price retail, wholesale and VIP from the same cost in one go: a cost of 40 with markups of 50 %, 20 % and 10 % gives 60, 48 and 44.
R
Runs in your browser
➗ MathFree
Convert ratio to percentage
See what share of the whole each part of a ratio is: 3:7 becomes 30 % and 70 %, and 30:70 gives exactly the same.
M
Runs in your browser
➗ MathFree
Rule of three calculator
Find the missing value of a proportion: if 4 notebooks cost 10, then 6 notebooks cost 15. Choose direct when both quantities rise together, or inverse when one…
M
Runs in your browser
🏠 Home, food & hobbiesFree
Split a shared expense by unequal shares
Divide one shared expense fairly when people use it differently: 120 split by weights of 1, 2 and 3 comes to 20, 40 and 60, and the amounts always add back to…
F
Runs in your browser
🧭 Travel & geographyFree
Feels-like temperature calculator
One feels-like number whatever the season: −5 °C with a 25 km/h wind feels like −12.31 °C by wind chill, while hot, humid air switches to the heat index…
F
Runs in your browser
🏠 Home, food & hobbiesFree
Convert cooking measurements
Move a recipe between cups and grams without guessing: 2 US cups of flour are turned into grams at 0.53 g per millilitre, because a cup of flour does not weigh…
R
Runs in your browser
🎓 EducationFree
Calculate weighted average of values with corresponding weights
Give each value the influence it deserves: scores of 82, 91 and 76 with weights of 0.25, 0.5 and 0.25 average 85, because the middle score counts twice as much.
K
Runs in your browser
⚙️ Developer UtilitiesFree
Lookup an ASCII Character Code in Decimal, Hex, Octal, and Binary
The letter A is decimal 65, hexadecimal 0x41, octal 0o101 and binary 01000001. Type one character, a decimal code or a 0x code and get the full table entry…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Convert number between bases 2–36 with digit validation
The hexadecimal number -deadBEEF becomes -1PS9WXB in base 36. Enter a whole number, say which base it is written in and pick any target base from 2 to 36; long…
M
Runs in your browser
⚙️ Developer UtilitiesFree
CSS Beautifier
A one-line stylesheet comes back as indented blocks with each declaration on its own line, yet a semicolon inside a quoted font name like “A; B” stays where it…
M
Runs in your browser
⚙️ Developer UtilitiesFree
HTML Beautifier
A whole page squeezed onto one line comes back with every nested element on its own line, two spaces deeper than its parent, so you can pair opening and closing…
M
Runs in your browser
⚙️ Developer UtilitiesFree
JavaScript Beautifier
A function squeezed onto one line comes back as indented blocks, while the semicolons in a for-loop header stay together and a string such as “a;b” is left…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Format a Keep a Changelog entry from grouped changes
Give it version 2.4.0, the date 2026-07-25 and your lists of changes, and it returns the entry headed ## [2.4.0] - 2026-07-25 with Added, Changed, Fixed and…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Parse command-line arguments with a flag and option spec
List the switches and options your program accepts, and it sorts the command line for you: --tag=stable --tag latest becomes the two tags stable and latest…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Conventional Commits message linter and parser
Check a commit header before it lands: feat(parser)!: support escaped delimiters is read as type feat, scope parser and a breaking change, while an unknown type…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Count lines of code by type
See how much of a file is real code: the sample function gives 6 lines, of which 4 are code, 1 is a comment and 1 is blank, judged by the comment rules of the…
M
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Build a curl command from an HTTP request
Turn a method, an address, headers and a body into a curl command you can paste straight into a shell: an apostrophe such as the one in Margaret's test is…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Compute a code file line diff
See exactly what changed between two versions of a file: rewriting return a + b as two new lines shows 2 added, 1 removed and 3 unchanged, with old and new line…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Parse a Docker Image Reference into Registry, Repository, Tag, or Digest
Paste registry.example.com:5000/team/service:2026.07 and get registry registry.example.com:5000, repository team/service and tag 2026.07, because the port colon…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Dockerfile best practices linter with line numbers
Three checks before your image is built: in the sample, node:latest on line 1, a missing WORKDIR and the RUN on line 5 that follows the one on line 3 give 3…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Parse dotenv file content into key-value pairs
Paste a .env file and get its settings as clean key–value pairs: in the sample, 7 keys come out, PORT keeps its later value 9090 and COLOR stays #336699…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Check a path against .gitignore patterns
Find out whether Git would ignore a file and which rule decides: logs/build.log is ignored because of *.log, the second rule in the list, and a later rule such…
M
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Parse Raw HTTP Headers into a Key-Value Object
Paste the header lines from a log or your browser and get one tidy list: names become lowercase, and the two Set-Cookie lines theme=dark and session=abc123 stay…
M
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Check whether an HTTP method is safe or idempotent
Find out whether a method can be repeated without surprises: put, typed with spaces, is read as PUT, not safe but idempotent, so sending it twice has the same…
M
Runs in your browser
🕸️ Web Scraping & MonitoringFree
List HTTP status codes by category and reason phrase
Pick one of five groups and get its assigned codes in order: informational gives 4 codes, from 100 Continue to 103 Early Hints, within the range 100-199 and…
M
Runs in your browser
🗂️ Data & FilesFree
Query JSON with JSONPath-style expressions
Pull values out of a data document with one short expression: $.store.books[*].title returns North and South, one title per book, in the order they appear.
M
Runs in your browser
⚙️ Developer UtilitiesFree
Generate a TypeScript interface from JSON
Paste a sample object and get a ready TypeScript interface: in the example, id becomes number, tags becomes string[] and the key display-name is kept in quotes…
M
Runs in your browser
✍️ Text & AIFree
Detect file line ending style
Find out which line breaks a file really uses: alpha, beta and gamma each ending in CRLF give the style CRLF with 3 breaks and 0 lone LF, and a single stray…
M
Runs in your browser
✍️ Text & AIFree
Extract links from Markdown
Get every link of a Markdown text as a clean list of label and address: the sample yields 4 links, from setup guide to Home, with reference links such as…
M
Runs in your browser
✍️ Text & AIFree
Generate a table of contents from Markdown
Turn your headings into a linked table of contents ready to paste: in the sample, Project Guide, Installation and Usage are indented by level, and the second…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Minify HTML code and measure the size reduction
Make a page lighter without changing what visitors see: the sample goes from 146 to 106 bytes, 27.4 % less, with 1 comment removed and its text, attributes…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Minify JavaScript whitespace and measure the size reduction
Strip comments and spare spaces from JavaScript without renaming anything: the sample function add goes from 59 to 30 bytes, 49.15 % smaller, and line breaks…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Check a Version Against a SemVer Range
Check whether a version fits a range in one step: 1.5.2 satisfies >=1.0.0 <2.0.0, while 1.5.0-beta.1 does not, because a broad range never lets an unstable…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Explain a regex pattern in plain language
See what each piece of a regular expression does: the sample email pattern splits into 16 explained parts with 3 capture groups, the first named user, each with…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Escape regex special characters for a literal match
Make any text safe to drop into a regular expression: invoice.total [draft]? becomes invoice\.total \[draft\]\?, so the period, brackets and question mark match…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Bump a Semantic Version by Major, Minor, or Patch
Get the next release number without slips: a minor bump turns 2.7.4 into 2.8.0, resetting the patch to zero, and any prerelease or build suffix is dropped…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Compare Semantic Version Numbers with SemVer Precedence
Find out which of two versions really comes first: 1.0.0-alpha.1 is lower than 1.0.0-alpha.beta, because a numeric label always ranks below a word, and 2.10.0…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Build a parameterized SQL WHERE clause from filters
Turn search filters into a safe WHERE clause: status active, age of at least 21 and role admin or editor become quoted column names with numbered placeholders…
M
Runs in your browser
⚙️ Developer UtilitiesFree
Compute two's complement binary
Convert in both directions at a fixed width: -18 in 8 bits is 11101110, and reading 11101110 at 8 bits gives -18 again, with widths from 2 to 53 bits and no…
M
Runs in your browser
⚙️ Developer UtilitiesFree
YAML indentation and syntax checker with line numbers
Catch the structural slips that break a YAML file: in the sample, port repeated on line 4 after line 3 and a tab on line 5 give 2 findings, each with its line…
M
Runs in your browser
🏠 Home, food & hobbiesFree
Bicycle Gear Ratio and Development Calculator
See how far one pedal turn takes you: a 50-tooth chainring with a 25-tooth cog gives a ratio of 2, so a 27.5-inch wheel turns twice per revolution, and the…
K
Runs in your browser
🏠 Home, food & hobbiesFree
Split carpool commute cost among riders
Divide the cost of a shared ride fairly: a commute total of 72 split among 3 riders comes to 24 each, or enter each rider’s distance so people who get out…
F
Runs in your browser
🏗️ Engineering & constructionFree
Estimate EV charging time remaining from battery size and charger power
Know when the car will be ready: a 75 kWh battery going from 20% to 80% needs 45 kWh, which takes about 4 hours and 5 minutes on an 11 kW charger.
M
Runs in your browser
🧭 Travel & geographyFree
EV Road Trip Charging Stops Calculator
Work out how many times you need to charge on the road: a 620-mile trip in a car with 300 miles of range and a 20% buffer needs 2 stops, splitting the route…
B
Runs in your browser
🏠 Home, food & hobbiesFree
Gift wrap paper calculator
Know how much paper to cut before you start: a 30 × 20 × 10 cm box has 2200 cm² of surface, and with the 10% overlap you need 2420 cm². Works in five units.
F
Runs in your browser
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