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🏠 Home, food & hobbiesFree
Build Goal Milestone Progress Chart Data Points
See honest progress toward a goal that did not start at zero: moving from 20 toward 100, a value of 68 is 60% done, the 25% and 50% milestones are reached and…
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🏠 Home, food & hobbiesFree
Grocery budget per meal calculator with category targets
Turn your grocery money into a target for every meal: a budget of 240 for 20 meals allows 12 per meal, split 30% protein, 30% produce and 40% everything else.
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🏠 Home, food & hobbiesFree
Habit tracking streak calculator
Count your streak from the days you actually completed a habit: July 20, 21, 23, 24 and 25 give a current streak of 3 and 5 completion days, even with a…
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🏠 Home, food & hobbiesFree
Estimate monthly appliance energy cost from watts and daily use
See what an appliance costs to run each month: 1,200 watts for 2.5 hours a day uses 3 kWh daily and 90 kWh a month, which comes to 16.2 at a rate of 0.18 per…
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❤️ Health & fitnessFree
Check the minimum home workout space needed for your exercise
Find out whether your room really fits the workout: a clear 3 by 2.5 metre area fits a rowing machine, which needs 2.743 by 1.219 metres.
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❤️ Health & fitnessFree
Intermittent Fasting Eating Window Calculator
Get exact clock times for your fasting plan: on 16:8, eating from 12:30 means the window closes and the next fast begins at 20:30.
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🏠 Home, food & hobbiesFree
Estimate leftover portions for freezing from recipe yield
Plan the freezer before you fill containers: 2,400 ml of soup in 300 ml servings makes 8 portions, and after 3 served now, 5 can be frozen.
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🏠 Home, food & hobbiesFree
Moving truck size calculator
Get a sensible starting point before you book: a normally furnished two-bedroom home points to a 20-foot truck with about 1016 cubic feet of space.
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🏠 Home, food & hobbiesFree
Calculate Party Supplies Quantity Needed
Buy enough without guessing: 40 guests with 1.5 plates, 2 cups and 3 napkins each plus a 10% buffer need 66 plates, 88 cups and 132 napkins, 286 items in all.
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📅 Dates & timeFree
Build a password rotation reminder schedule
Turn a rotation rule into dates you can act on: a password last changed on 2024-12-15 with a 90-day interval is due on 2025-03-15, and a 14-day warning lands on…
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📅 Dates & timeFree
Build a recurring bills due date calendar
On January 30, 2026, a bill due on day 1 falls on February 1, while one due on day 30 is still due that same day.
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❤️ Health & fitnessFree
Running Shoe Mileage Calculator
A pair with a 400-mile limit and 365 miles logged has 35 miles left and 91.25% used, so it is flagged as due soon.
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❤️ Health & fitnessFree
Average daily screen time calculator
Seven days totaling 1,560 minutes average 222.86 minutes a day, with Saturday highest at 360 and Sunday lowest at 120.
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❤️ Health & fitnessFree
Calculate optimal wake-up times by sleep cycle
Go to bed at 22:30, allow 15 minutes to fall asleep, and with 90-minute cycles your wake-up options run from 00:15 to 07:45, each on a cycle boundary.
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❤️ Health & fitnessFree
Daily step goal progress percentage calculator
With a goal of 10,000 steps and 6,750 walked so far, you are at 67.5% and need 3,250 more. Enter your daily target and today's count for an instant progress…
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🏠 Home, food & hobbiesFree
Storage unit size recommendation for boxes and furniture
Twenty standard boxes, one sofa and one dresser need about 30 square feet, so the recommendation is a 5 by 10 foot unit.
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📅 Dates & timeFree
Free trial end date and reminder date calculator
A 14-day trial that starts on July 25, 2026 ends on August 8, and a 3-day lead puts your reminder on August 5.
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📅 Dates & timeFree
Calculate Multiple Warranty Expiration Dates and Upcoming Deadlines
Headphones bought on August 15, 2025 with a 12-month warranty expire on August 15, 2026, just 15 days after July 31, so they are flagged inside a 30-day window.
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❤️ Health & fitnessFree
Daily water bottle refill calculator
A daily goal of 2,000 ml with a 750 ml bottle means 3 bottlefuls, because even a partial last bottle counts as one more fill.
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❤️ Health & fitnessFree
Estimate calories burned by activity MET, weight and duration
A 72 kg person doing a 6.5 MET activity for 45 minutes burns about 351 kilocalories: MET times weight times hours.
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❤️ Health & fitnessFree
Determine your cardio training zone from heart rate
A heart rate of 152 with a maximum of 190 is 80 % of max, which puts you at the start of zone 4, Threshold.
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❤️ Health & fitnessFree
Estimate sweat rate from a pre- and post-workout weigh-in
Dropping from 72.4 to 71.8 kg in a 90-minute session while drinking 0.75 liters means about 1.35 liters of sweat, or 0.9 liters per hour.
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❤️ Health & fitnessFree
Progressive overload weight plan calculator
Starting at 100 with a 2.5 % weekly increase gives 102.5 in week two and 105.0625 in week three, because each increase builds on the previous week.
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❤️ Health & fitnessFree
Estimate distance from step count and stride length
8,000 steps with a 0.72-meter stride cover 5,760 meters, or 5.76 kilometers. No stride measured? Enter your height and it is estimated for you, and the result…
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❤️ Health & fitnessFree
Acute:chronic workload ratio calculator and risk zones
A week at 520 against a four-week average of 400 gives a ratio of 1.3, the top of the commonly cited sweet spot.
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📄 Documents & PDFFree
Copyright Notice Generator
Northstar Studio LLC with the years 2021-2026 becomes “© 2021–2026 Northstar Studio LLC”, with stray spaces removed and a proper dash in the range.
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📄 Documents & PDFFree
Generate a demand letter structure template
Three dated facts about an unpaid invoice become a structured letter: the facts first, then your exact request, a 10-day deadline after receipt and your next…
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💰 Finance & moneyFree
Generate an employee termination checklist by termination type
Choose layoff and you get 11 ordered steps, from documenting the business reason and selection criteria to final pay, benefits notices, equipment return and…
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📄 Documents & PDFFree
Generate a GDPR data subject request response checklist
An access request gets 10 ordered steps, from logging the receipt date and the one-month deadline to confirming identity, searching every system and replying…
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💰 Finance & moneyFree
List independent contractor classification factors
A description with their own schedule, own laptop, other clients, a fixed project fee and a six-month project yields 6 contractor indications and 1 topic…
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🖼️ ImagesFree
Standard resolutions for an aspect ratio
Pick a ratio and get its recognized sizes: for 16:9 the list runs from 640 × 360 up to 7680 × 4320, with 1920 × 1080 labeled Full HD and the pixel count beside…
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🏗️ Engineering & constructionFree
Estimate device battery life from battery capacity and current draw
A 2400 mAh battery feeding a device that averages 120 mA lasts about 20 hours: capacity divided by average current gives the ideal runtime.
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📏 Unit convertersFree
Convert bra size between US, UK and EU regions
A US 34DD is a 75E in EU sizing and stays 34DD in the UK: enter one full size with the system printed on the label and get all three regional labels from a…
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🏠 Home, food & hobbiesFree
Parse chess time control notation and calculate game duration
A 90+30 game over 40 moves can use up to 220 minutes of clock time: the notation is split into base minutes and increment seconds, and both players' clocks are…
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📅 Dates & timeFree
Determine Chinese zodiac from year
1990 is a Yang Metal Horse year. Enter any birth year to get the animal, the element, its Yin or Yang polarity, the Heavenly Stem and Earthly Branch, and its…
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📏 Unit convertersFree
Convert clothing sizes between US, UK and EU regions
A women's US 8 is a UK 12 and an EU 38: enter a numeric size, its region and women or men, and get all three regional sizes from the same row of a standard…
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📏 Unit convertersFree
Convert data storage units
One KB is 1,000 bytes but one KiB is 1,024, and the gap grows with every step up to TB. Pick the unit you have and the one you need, and the exact byte count is…
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📏 Unit convertersFree
Convert fuel efficiency units
30 US MPG is just under 8 L/100km and more than 12 km/L: enter one figure with its unit and get all four, with US and imperial gallons kept apart and the…
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📅 Dates & timeFree
Look up a generation cohort from a birth year
Someone born in 1990 is a Millennial, a range that runs from 1981 through 1996. Enter a birth year to get its cohort, from the Lost Generation to Generation…
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🕸️ Web Scraping & MonitoringFree
Estimate file download time from size and connection speed
A 750 MB file over a 100 Mbps connection takes about one minute in ideal conditions. Enter the size and the speed in the units you have, and get the time in…
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🏠 Home, food & hobbiesFree
Knitting gauge adjustment calculator
If the pattern says 100 stitches at 20 per four inches and your swatch gives 22, cast on 110 to keep the same width.
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🔬 ScienceFree
Estimate the moon phase for any calendar date
April 8, 2024 comes out as a new moon, about 1 % lit and 28.59 days into the cycle. Enter any date to get the phase name, the lunar age, how much of the Moon is…
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🏠 Home, food & hobbiesFree
Calculate name numerology value
Type a name and see its Pythagorean numerology number with the working shown: Ada Lovelace uses 11 letters, adds up to 36 and reduces to 9.
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🏠 Home, food & hobbiesFree
Calculate your numerology life path number from a birth date
Enter a birth date and get its life path number with the arithmetic laid out: 1988-11-29 adds up to 39, then 12, then 3.
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🏠 Home, food & hobbiesFree
Oil change due mileage calculator
Add the service interval to the reading at your last oil change and compare it with today: a change at 42,000 miles with a 5,000-mile interval is due at 47,000…
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🖼️ ImagesFree
Required print DPI calculator
Plan a print in either direction: a 10 by 8 inch print at 300 DPI needs at least 3000 by 2400 pixels, and for an image you already have you see the DPI it…
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📏 Unit convertersFree
Convert ring size between regions
See one ring size in all three systems at once: US size 7 is UK O and EU 54, an inner circumference of 54 mm.
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📏 Unit convertersFree
Convert a date to Roman numeral format for tattoos and engravings
Get a Roman numeral date you can engrave with confidence: 25 July 2026 becomes XXV-VII-MMXXVI in day-month-year order.
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➗ MathFree
Calculate screen diagonal from dimensions
Measure the visible panel and get its size corner to corner, so a screen 3 inches wide and 4 inches tall has a 5-inch diagonal.
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⚙️ Developer UtilitiesFree
Subnet usable host calculator
Know how many devices fit in an IPv4 subnet before you plan it: a /24, or 255.255.255.0, holds 256 addresses, of which 254 are usable hosts.
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📏 Unit convertersFree
Convert tire pressure units between PSI, bar, and kPa
Enter one tire pressure and see it in all three units: 35 PSI equals 2.413165 bar and 241.316505 kPa.
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🏠 Home, food & hobbiesFree
Decode tire size notation
Understand the code on your tire sidewall: 225/45R17 means a 225 mm section width, a sidewall 45% as tall as that width, radial construction and a 17-inch rim.
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✅ ValidationFree
Validate a VIN check digit
Catch a mistyped VIN before it reaches a record: 1M8GDM9AXKP042788 passes because its ninth character, X, matches the calculated check digit.
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⚙️ Developer UtilitiesFree
Check WiFi channel overlap for 2.4 GHz channels
Find out whether two Wi-Fi channels step on each other: channel 1 sits at 2412 MHz and channel 6 at 2437 MHz, so their 20 MHz ranges do not overlap.
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📅 Dates & timeFree
Determine zodiac sign from birthdate
Enter a birth month and day to get the sun sign and its range: August 23 is Virgo, which runs from August 23 to September 22.
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🏠 Home, food & hobbiesFree
College fund progress percentage calculator
Saving 18,500 toward a 50,000 goal puts the fund at 37% with 31,500 still to go. If you pass the goal, the percentage keeps climbing above 100 so the extra…
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🏠 Home, food & hobbiesFree
Determine diaper size by weight
A baby weighing 7.5 kg gets size 2, which covers 5.44 to 8.16 kg, and size 3 is listed as also eligible.
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🏠 Home, food & hobbiesFree
Seeded screen-free activity picker for kids by age
For children aged 6 to 8 and the seed “rainy-saturday”, the picker suggests building a paper bridge indoors, one of 2 matching activities.
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💰 Finance & moneyFree
Calculate total mortgage interest paid over the full loan term
See what a fixed-rate mortgage really costs over its full term: 300,000 at 6.5% for 30 years means 360 payments and 382,633.47 in total interest, on top of the…
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💰 Finance & moneyFree
Calculate property cap rate from NOI and market value
Divide a property's annual net operating income by its market value and get the cap rate: 72,000 of income on a 900,000 building is 8 percent, a quick way to…
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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
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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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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
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The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
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