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⚙️ Developer UtilitiesFree
Struct field offset calculator
A char, an int and a char take 12 bytes, not 6: this calculator shows each member's offset, the padding before it and the trailing padding, with the same rules…
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Runs in your browser
✍️ Text & AIFree
Tabs to spaces converter
A tab at the start of a line becomes 4 spaces, but a tab after one character becomes 3: each tab jumps to the next tab stop, so alignment survives and the file…
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✍️ Text & AIFree
Sørensen–Dice string similarity calculator
Score how alike two texts are by the character pairs they share: night and nacht have only ht in common and score 0.25, while identical strings score 1.
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✍️ Text & AIFree
Levenshtein Edit Distance Calculator for Two Strings
Count the fewest single-character edits that turn one string into another: kitten becomes sitting in 3 edits, two substitutions and one insertion.
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✍️ Text & AIFree
Longest common subsequence calculator
Find the longest run of characters two strings share in the same order, gaps allowed: ABCBDAB and BDCABA share 4, for example BCBA.
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⚙️ Developer UtilitiesFree
Requests per second to daily converter for traffic planning
Put one steady traffic rate on every clock at once: 125 requests per second is 7,500 per minute, 450,000 per hour and 10,800,000 per day.
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✍️ Text & AIFree
Repeated substring pattern detector
Find out whether a string is just one fragment written over and over: ababab is ab three times and aaaa is a four times, while aba does not repeat.
A
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⚙️ Developer UtilitiesFree
Servers needed for load calculator
Turn a traffic peak into a server count: 10,000 requests per second on servers that handle 1,200 each, with 25 % kept in reserve, needs 12 servers, because each…
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⚙️ Developer UtilitiesFree
Batch throughput calculator
A batch of 500 items every 20 seconds sustains 25 items per second, 1,500 per minute and 90,000 per hour.
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⚙️ Developer UtilitiesFree
RAID capacity calculator
See how much space a RAID array really leaves you and how many disks it can lose: four 1000 GB disks in RAID 5 give 3000 GB usable, 75% efficiency and survive…
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⚙️ Developer UtilitiesFree
SemVer range satisfies checker
Check whether a version falls inside a range, as when 2.4.1+build.7 satisfies 1.8.x || >=2.0.0 <3.0.0 through the second alternative.
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⚙️ Developer UtilitiesFree
Token bucket rate limit calculator
A bucket of 10 tokens holding 5 and refilling at 2 per second has 8 ready after 1.5 seconds, so a burst of 3 goes through and leaves 5.
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🖼️ ImagesFree
ANSI truecolor generator
#33A1FF becomes red 51, green 161 and blue 255, wrapped in the escape code 38;2;51;161;255 for terminal text.
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🕸️ Web Scraping & MonitoringFree
MIME Type to File Extension Lookup
Find the file extension that matches a MIME type: Image/JPEG with a charset parameter resolves to jpg, with jpeg and jpe as alternatives, and unknown types are…
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Runs in your browser
⚙️ Developer UtilitiesFree
Glob pattern to regex converter
Paste a glob and get the matching regular expression: *.js becomes ^.*\.js$, with the dot escaped so it only matches a real dot.
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⚙️ Developer UtilitiesFree
Key Length to Keyspace Calculator
Turn a key length into the exact number of possible keys: a 56-bit key has 72,057,594,037,927,936, and a 128-bit key has 2 to the power 72 times as many.
K
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🕸️ Web Scraping & MonitoringFree
Query String to JSON Converter
Paste the query part of a web address and read every key with its decoded value: tag=sale&tag=new becomes one tag list holding sale and new, and percent codes…
K
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⚙️ Developer UtilitiesFree
Rendezvous hashing node selector
Assign a key to one node from your list: user:42 across cache-a, cache-b and cache-c lands on cache-a, and stays there until the node list or the seed changes.
A
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🖼️ ImagesFree
Screen resolution pixel calculator
Work out pixels and graphics memory from a resolution: 1920 by 1080 at 32 bits per pixel is 2,073,600 pixels, about 2.07 megapixels, and 8,294,400 bytes for one…
P
Runs in your browser
📏 Unit convertersFree
SI vs IEC byte converter
Translate between the GB printed on the box and the GiB your system shows: 1000 GB is about 931.32 GiB, a gap of about 6.87 %, and no capacity is missing.
A
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⚙️ Developer UtilitiesFree
Umask calculator
With umask 022, new files get 644 (rw-r--r--) and new folders get 755 (rwxr-xr-x): enter any umask to see the default permissions it produces, in octal and rwx…
P
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⚙️ Developer UtilitiesFree
UUID format validator
550E8400-E29B-41D4-A716-446655440000 is valid, version 4 with the RFC 4122 variant, and comes back in lowercase canonical form: paste a UUID to check its…
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✍️ Text & AIFree
Acronym Generator for Projects, Variables, and Constants
“Center for Research and Development” becomes CRD: the tool keeps the first letter of each significant word and leaves out “for” and “and”.
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⚙️ Developer UtilitiesFree
Hamming ECC parity bits calculator
Find the fewest parity bits a Hamming code needs for your data: 4 data bits need 3, giving the classic (7,4) code with no spare syndromes.
A
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⚙️ Developer UtilitiesFree
Fenwick tree index calculator
Type an index and see how a Fenwick tree moves from it: index 13 is 1101 in binary, its lowest set bit is 1, the update step goes to 14 and the query step to…
S
Runs in your browser
🕸️ Web Scraping & MonitoringFree
HTTP Range header calculator
Check a byte range before you send it: 0-499 on a 10000-byte file means the first 500 bytes, a satisfiable range that earns 206 Partial Content and the line…
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Runs in your browser
⚙️ Developer UtilitiesFree
IPv6 to binary converter
See all 128 bits behind an IPv6 address such as 2001:db8::1, expanded to eight groups of sixteen bits that start with 0010000000000001, with every leading zero…
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💰 Finance & moneyFree
Quarterly Compound Interest Calculator
10,000 at 5% a year, compounded quarterly for 10 years, grows to 16,436.19, of which 6,436.19 is interest.
K
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💰 Finance & moneyFree
Effective Annual Rate Calculator
A 12% nominal rate compounded 12 times a year is really 12.682503% a year. Enter the stated rate and how often interest is added to see the true yearly rate and…
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Runs in your browser
💰 Finance & moneyFree
Rule of 72 required rate
Say how many years you allow for your money to double and get the yearly return you would need: 9 years means about 8% a year, because 72 divided by 9 is 8.
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💰 Finance & moneyFree
Annuity payment from future value calculator
Work out the equal deposit that grows to a target such as 100,000 over 120 periods at 0.5% per period, and see how much you pay in and how much interest adds.
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💰 Finance & moneyFree
Effective rate including fees calculator
A 200 fee on 10,000 over 4 years adds 0.5 points a year, so a 5% stated rate becomes 5.5% all in. Enter the amount, rate, fee and term to compare offers fairly…
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Runs in your browser
💰 Finance & moneyFree
Future Value of Ordinary Annuity Calculator
Saving 500 at the end of each month for 120 months at 0.5% a month grows to 81,939.67: 60,000 from your deposits and 21,939.67 in interest.
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💰 Finance & moneyFree
Implied interest rate calculator
Find the steady rate that turns one amount into another: 1,000 growing to 1,210 over 2 periods means 10% per period.
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💰 Finance & moneyFree
Loan refinance savings calculator
Check whether refinancing really pays: moving 250,000 from 6.75% with 300 months left to 5.5% over 240 months saves only 7.56 a month, yet 100,451.26 over the…
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💰 Finance & moneyFree
Loan total interest calculator
Borrow 250,000 at 6.5% for 30 years and you pay 318,861.22 in interest, more than the loan itself.
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💰 Finance & moneyFree
Negative Amortization Balance Calculator
On 200,000 at 6%, the first month charges 1,000 of interest; pay only 500 and the unpaid 500 is added, so the balance becomes 200,500.
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💰 Finance & moneyFree
Perpetuity Present Value Calculator
A payment of 1,250 a year forever, discounted at 6.25% a year, is worth 20,000 today: the payment divided by the rate.
K
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💰 Finance & moneyFree
Student Loan Payment Calculator
A 30,000 student loan at 5.5% over 10 years costs 325.58 a month across 120 payments, with 9,069.46 of interest in total.
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💰 Finance & moneyFree
Loan APR from fees calculator
See what financed fees really cost: borrowing 200,000 at 6.5% for 360 months with 4,000 of fees rolled in gives a true APR of 6.6914%, not 6.5%.
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💰 Finance & moneyFree
15 vs 30 year mortgage calculator
On 400,000, a 15-year loan at 5.75% costs 793.37 more each month than a 30-year loan at 6.5%, yet saves 312,282.69 in interest.
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💰 Finance & moneyFree
Home affordability calculator
With 120,000 a year in income, 750 in monthly debts and 60,000 down, a 30-year loan at 6.5% supports a home of about 397,937.83.
K
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💰 Finance & moneyFree
Mortgage PMI cost calculator
On a 280,000 loan at 6.5% with a 0.55% PMI rate, insurance costs 128.33 a month for 156 months, 20,020 in total, until the balance reaches 218,400.
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💰 Finance & moneyFree
Discount Points Break-Even Calculator
Paying 1.25 points on 400,000 costs 5,000 upfront; if it cuts the monthly payment from 2,530.27 to 2,421.79, you recover it in 46.09 months, fully by month 47.
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💰 Finance & moneyFree
Rule of 78 interest schedule calculator
Allocate a loan's interest by the Rule of 78: 780 of interest over 12 installments puts 120 in the first, 110 in the second and only 10 in the last.
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💰 Finance & moneyFree
Second mortgage payment calculator
Borrow 50,000 at a fixed 8.5% over 15 years and the monthly payment is 492.37, with 38,626.56 of interest if you keep the loan to the end.
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Runs in your browser
💰 Finance & moneyFree
Annualized return calculator
A 50% total gain over 5 years works out to about 8.45% a year, not 10%. Enter the total return and the years held to get the compounded yearly rate and the…
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💰 Finance & moneyFree
Dividend Income Target Calculator
To collect 24,000 a year in dividends at a 4% yield, you need a portfolio of 600,000, the same as 2,000 a month.
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💰 Finance & moneyFree
Dividend Reinvestment (DRIP) Calculator
Reinvesting every dividend turns 100 shares at 50, with a 4% yield paid quarterly and 6% yearly price growth, into 148.8864 shares after 10 years.
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💰 Finance & moneyFree
Biweekly Mortgage Payoff Calculator
On 300,000 at 6.5% over 30 years, paying half the monthly payment every two weeks clears the loan nearly six years sooner and saves 88,121.78 in interest.
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💰 Finance & moneyFree
Mortgage prepayment penalty calculator
A 2% penalty on a 250,000 balance is 5,000, so clearing the mortgage takes 255,000. Enter the outstanding balance and the percent in your note to see the fee…
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💰 Finance & moneyFree
Reverse mortgage payout calculator
A home worth 500,000 with an age factor of 0.85 and a principal limit factor of 0.52 gives an estimated payout of 221,000.
K
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💰 Finance & moneyFree
Four percent rule calculator
A 1,000,000 portfolio at the classic 4% rate supports about 40,000 a year, or 3,333.33 a month. Turn it around to see the nest egg your spending calls for, and…
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💰 Finance & moneyFree
Time-weighted return calculator
Chain sub-period returns so deposits and withdrawals don't distort performance: a 3% period followed by a 4% period compounds to 7.12%, not 7%.
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💰 Finance & moneyFree
Yield to call calculator
A bond bought at 980 and called in 4 years at 1,020, with a 5% coupon paid twice a year, yields just over 6% a year until it is called.
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💰 Finance & moneyFree
Expense ratio return drag calculator
With 10,000 growing 8% a year for 20 years, a 1% expense ratio leaves you 7,912.73 short of the zero-fee result, more than a sixth of the final value.
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💰 Finance & moneyFree
Margin of safety price calculator
If you value a share at 100 and it trades at 70, your margin of safety is 30%: you pay only 70% of estimated worth.
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💰 Finance & moneyFree
PEG Ratio Calculator
A stock with a P/E of 30 and expected earnings growth of 20% has a PEG ratio of 1.5, so its price is high relative to that stated growth.
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💰 Finance & moneyFree
Stock profit loss calculator
Buy 100 shares at 50, sell at 65, pay 7.5 in commission each way, and your net profit is 1,485, a 29.66% return on cost.
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💰 Finance & moneyFree
Zero-coupon bond price calculator
Find what a zero-coupon bond is worth today: a face value of 1,000 at 5% a year with 10 years left is priced at 613.91, a discount of 386.09.
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One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
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Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
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