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💰 Finance & moneyFree
Calculate Annual HOA Fee Total from Monthly or Quarterly Dues
Put HOA dues quoted per month, per quarter or per year on the same footing: 185.5 a month comes to 2,226 a year, ready to set beside your mortgage, insurance…
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💰 Finance & moneyFree
Calculate PMI removal threshold from home value and loan balance
Find out how far you are from the 80% loan-to-value mark: a 340,000 balance on a 400,000 home is 85% LTV, so paying down 20,000 of principal brings you to the…
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💰 Finance & moneyFree
Annual property tax calculator
Multiply the assessed value by the local tax rate, entered in mills or as a percentage: 350,000 at 18.5 mills is an effective rate of 0.0185 and 6,475 in annual…
K
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💰 Finance & moneyFree
Calculate refinance break-even months from costs and savings
Find out when a refinance pays for itself: 5,750 in closing costs and 240 saved each month break even at 23.958333 months, so the costs are fully recovered in…
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💰 Finance & moneyFree
Calculate room square footage from length and width
Turn room measurements into square feet in one go: a 15 by 12 living room is 180, an 11.5 by 10 bedroom is 115 and an 8.25 by 6 space is 49.5, for a total of…
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💰 Finance & moneyFree
Estimate utility cost per square foot
Put utility bills for homes of different sizes on the same scale: a 240 monthly bill for a 1,600-square-foot property works out to 0.15 per square foot per…
K
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⚙️ Developer UtilitiesFree
Validate API key format
A key passes when it starts with the expected prefix, is exactly 18 characters long including that prefix and uses only letters and digits after it.
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⚙️ Developer UtilitiesFree
CORS header configuration checker
A response that allows app.example.com with credentials and lists Origin in its Vary header passes with 0 issues.
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⚙️ Developer UtilitiesFree
Check File Extension Risk Level for Email Attachments
Quarterly.Report.DOCM is read as .docm, a macro-capable document with high risk, so the advice is to quarantine it until a macro-aware scan clears it.
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Runs in your browser
⚙️ Developer UtilitiesFree
Map data fields to GDPR categories and special-category flags
Out of five names, medicalHistory, union-membership and a face template are flagged as special categories (3), while a customer email and a preferred language…
B
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⚙️ Developer UtilitiesFree
Compare hash algorithm output length and collision security
SHA-256 produces a 256-bit digest and its collision resistance is not broken, while MD5 and SHA-1 are flagged as broken.
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⚙️ Developer UtilitiesFree
Build an HSTS header value
A lifetime of 31536000 seconds with both options on becomes one line: max-age first, then includeSubDomains, then preload.
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⚙️ Developer UtilitiesFree
TOTP time window calculator
At Unix time 1700000000 with a 30-second period, you are in window 56666666 with 10 seconds left before the counter moves on.
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⚙️ Developer UtilitiesFree
Classify data fields as PII
Five names give 2 direct identifiers, an email and a passport number, 2 indirect ones such as birthDate and device-id, and 1 non-personal order total, each with…
K
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⚙️ Developer UtilitiesFree
Parse rate-limit response headers and calculate reset time
A limit of 100 with 42 remaining and a reset of 60 at 12:00 UTC means requests open again at 12:01, in 60 seconds.
B
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⚙️ Developer UtilitiesFree
Estimate secure delete overwrite passes for SSD or HDD
On a modern hard disk, 1 complete overwrite pass is enough, while on an SSD no pass count is reliable, so a built-in sanitize or cryptographic erase is the…
R
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⚙️ Developer UtilitiesFree
Format an SSH key fingerprint as colon hex or Base64
Hash bytes beginning 222, 173, 190 and 239 display as de:ad:be:ef in colon-separated hex, with a zero byte kept as 00, or as an unpadded Base64 string.
M
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⚙️ Developer UtilitiesFree
Check whether a TLS version is still supported
Type a TLS version and see at once whether it is still supported: TLS 1.3 and TLS 1.2 pass, while TLS 1.0 and TLS 1.1 come back deprecated, each with a short…
F
Runs in your browser
⚙️ Developer UtilitiesFree
Seeded two-factor backup code generator
Ask for 5 recovery codes with a secret seed and you get 5 unique one-time codes such as 8476-8082, always the same list in the same order for that seed, so they…
R
Runs in your browser
⚙️ Developer UtilitiesFree
Webhook signature verification steps
Give the HMAC algorithm, such as HMAC-SHA256, and the header that carries the signature, and get 8 ordered steps: keep the raw body, rebuild the signed message…
M
Runs in your browser
🧭 Travel & geographyFree
Cash denomination calculator
A total of 6 built from pieces worth 4, 3 and 1 needs just two pieces, 3 + 3, where taking the largest first would use three.
M
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🧭 Travel & geographyFree
Frequent flyer miles value calculator
25,000 miles for a flight you would otherwise buy for 425 works out to 1.7 cents per mile, 13.33 % above a 1.5-cent target, so it rates good.
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🧭 Travel & geographyFree
Hotel price per night calculator
A five-night stay totaling 847.35 comes to 169.47 per night once every tax and fee is in, the figure that really compares with other listings rather than the…
K
Runs in your browser
🧭 Travel & geographyFree
Check itinerary time conflicts and overlapping activities
A museum visit from 09:00 to 11:00 and a walking tour starting at 10:30 overlap by 30 minutes, while lunch at 12:00, right after the tour, does not.
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Runs in your browser
🧭 Travel & geographyFree
Estimate jet lag adjustment days
Six time zones eastward means about six days to adjust, while the same six zones westward take about four, because advancing your body clock is harder than…
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Runs in your browser
🧭 Travel & geographyFree
Check passport validity for a travel date
Returning on 20 September 2026 means your passport must be valid until at least 20 March 2027; one expiring on 20 April 2027 passes with 212 days to spare.
R
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🧭 Travel & geographyFree
Road trip fuel stop calculator
A 1,000-mile drive with 400 miles of range and a 20 % reserve means filling up every 320 miles: three stops after leaving with a full tank.
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🎬 VideoFree
Letterbox bar pixel size calculator for video canvases
Know how big the black bars must be before you export: a 21:9 picture on a 16:9 canvas 1080 pixels high needs bars of 128.571429 px above and below.
R
Runs in your browser
🎬 VideoFree
LUT blend intensity preview
See what a LUT looks like at partial strength before you commit: at 40 %, a base colour of #406080 graded towards #D08020 becomes #7A6D5A, given as hex and RGB…
K
Runs in your browser
🎬 VideoFree
Build a video file naming convention
Project KTC, scene 12A, take 3 and 25 July 2026 become KTC_SC12A_T03_20260725.mov: one predictable name that sorts by production and date, so every clip can be…
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Runs in your browser
🎬 VideoFree
Build an adaptive streaming bitrate ladder from a source resolution
A 1920 × 1080 source gets four renditions, from 1080p at 5,000 kbps down to 360p at 800 kbps, each sized to keep the original shape and never enlarged beyond…
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Runs in your browser
💰 Finance & moneyFree
Affiliate Commission Calculator for Tiered Payouts
Find the payout owed on a single affiliate sale: a 250 sale with 12,500 in qualifying volume reaches the 7.5% tier and earns 18.75.
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Runs in your browser
💰 Finance & moneyFree
Dropshipping profit per order calculator
See what one dropshipping order really earns: a 49.99 sale with an 18.5 supplier cost, a 5 marketplace fee and a 1.75 payment fee leaves 24.74 net profit, a…
K
Runs in your browser
💰 Finance & moneyFree
Free shipping threshold calculator
Tell shoppers exactly how far they are from no-cost delivery: a cart at 42.50 with a threshold of 60 needs 17.50 more, and a cart that already qualifies gets…
K
Runs in your browser
💰 Finance & moneyFree
Calculate Inventory Turnover Ratio and Days to Sell Through
Measure how fast stock moves: 480,000 in cost of goods sold against 120,000 of average inventory over 365 days is a turnover of 4, or 91.25 days to sell…
R
Runs in your browser
💰 Finance & moneyFree
Check A/B test sample size adequacy and conversion significance
Read a landing-page test in plain numbers: 500 conversions from 5,000 visitors on A against 600 from 5,000 on B is 10% versus 12%, a gap of 2 percentage points…
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Runs in your browser
💰 Finance & moneyFree
Marketplace Fee Calculator
See the payout before you list: a 125 sale with a 12.5% marketplace fee and a 0.3 fixed fee costs 15.93 in fees and leaves a net payout of 109.07.
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Runs in your browser
💰 Finance & moneyFree
Product Bundle Discount Calculator
Price a bundle without spreadsheet slips: three items adding up to 40 with a 20% bundle discount save 8, so the bundle sells for 32. Free in your browser.
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Runs in your browser
💰 Finance & moneyFree
Calculate product return rate from units sold and returned
Track how many sold units come back: 37 returns out of 1,250 units sold is a return rate of 2.96%.
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Runs in your browser
💰 Finance & moneyFree
Calculate weighted average product rating from star counts
Get the rating shoppers actually see: 4 one-star, 6 two-star, 10 three-star, 30 four-star and 50 five-star reviews give a weighted average of 4.16 from 100…
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Runs in your browser
💰 Finance & moneyFree
Subscription plan change proration calculator
Moving from a 30 plan to a 60 plan with 10 of 30 days left gives a credit of 10, a charge of 20 and a net 10 to collect.
K
Runs in your browser
🏠 Home, food & hobbiesFree
Ten-Pin Bowling Score Calculator by Frame
Enter ten frames of pins and get the official score: the sample game, ending with three strikes in a row, totals 167.
R
Runs in your browser
🏠 Home, food & hobbiesFree
Seeded Standard Card Deck Shuffle
Seed 42 always gives the same order of all 52 cards, starting with the three of clubs, the nine of clubs and the two of hearts.
B
Runs in your browser
🏠 Home, food & hobbiesFree
Darts Checkout Calculator
170 left is finished with treble 20, treble 20 and the double bull. Enter any remaining score from 2 to 170 to get a legal checkout in up to three darts, always…
F
Runs in your browser
🏠 Home, food & hobbiesFree
Parse D&D dice notation
2d6+3 means two six-sided dice plus 3: the total ranges from 5 to 15 and averages 10. Type one dice expression such as d20-1 or 4d8 to see the dice count…
R
Runs in your browser
🏠 Home, food & hobbiesFree
Elo Rating Update Calculator
A 1400 player who beats a 1600 player with a K-factor of 32 gains about 24 points, and the opponent loses the same amount.
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🏠 Home, food & hobbiesFree
Poker Hand Ranking Calculator
AS KS QS JS 10S is a royal flush, the top category with a strength of 10. Enter five cards to name the hand, from high card upward, and get the tie-break order…
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Runs in your browser
🏠 Home, food & hobbiesFree
Build a round-robin schedule from participant names
Four teams such as Falcons, Owls, Ravens and Hawks get 3 rounds and 6 matches, with everyone meeting everyone exactly once.
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🏠 Home, food & hobbiesFree
RPG XP to next level calculator
A level-12 character with 875 XP on the linear curve needs 325 more, since that level's threshold is 1200.
K
Runs in your browser
🏠 Home, food & hobbiesFree
Validate Sudoku Board Legality
Find out whether a 9x9 Sudoku position already breaks the rules before you spend more time on it: each filled digit from 1 to 9 is checked against its row…
K
Runs in your browser
🏠 Home, food & hobbiesFree
Check Tic-Tac-Toe Winner, Draw, or Game in Progress
Paste a 3x3 board such as X O X / O X - / - O X and learn that X has won on the diagonal from the top-left corner; draws, games still in play and impossible…
R
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🏠 Home, food & hobbiesFree
Build a single-elimination bracket with automatic byes
Five teams become an eight-slot bracket with three byes for the top seeds, one opening match and three rounds through the final, and the same list always gives…
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🏠 Home, food & hobbiesFree
Generate a Word Search Puzzle Grid
Give it ORBIT, MOON and STAR, an 8 by 8 grid and the seed 42, and you get a finished puzzle plus the exact start and direction of every word; the same seed…
B
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🏠 Home, food & hobbiesFree
Flower bulb calculator
A 100-square-foot bed planted at 5 bulbs per square foot takes 500 bulbs. Add an overplant percent for edges, damaged bulbs or squirrel losses, and the total is…
A
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➗ MathFree
Bitwise calculator
60 AND 13 is 12, 60 OR 13 is 61 and 60 XOR 13 is 49. Combine two 32-bit integers with AND, OR, XOR or a shift and get exactly what C, Java or JavaScript would…
A
Runs in your browser
🏠 Home, food & hobbiesFree
Pond volume calculator
A 12 by 8 ft pond with an average depth of 2.5 ft holds 240 cubic feet, close to eighteen hundred US gallons.
A
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🏠 Home, food & hobbiesFree
Fence cost estimator
Enter 20 panels, 21 posts, 21 units of concrete and 1 gate with your supplier's unit prices, and get four line costs plus one fence total you can check by hand.
A
Runs in your browser
🏠 Home, food & hobbiesFree
Fence gate calculator
Two 4-foot gate openings need 4 gate posts, 4 hinges and 2 latches: each opening gets a hinge post and a latch post, and leaves up to 5 feet wide get 2 hinges.
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🏠 Home, food & hobbiesFree
Fence panel calculator
A 48-foot straight run with 8-foot panels takes 6 panels and 7 posts, because neighbouring panels share a post.
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🏠 Home, food & hobbiesFree
Lawn roller fill calculator
An 18-inch drum that is 24 inches wide holds about 100 litres of water when full, roughly 100 kg of ballast.
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How it works
1
Get your key
Create an account with your email and add balance when you need it. No subscription, no sales call.
2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
Pay only for what you use
No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.
Free tools
$0.00
On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
Pay-as-you-go
Per task
$0.002+
The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
Balance
$10.00+
Top up your balance and spend it across web, API and the app. It never expires.