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Calculators, converters, PDF, text, images and much more — each with its own page. Type your data and get the result right here, with no sign-up and without your data leaving your device. Need them in your own app? The same tools are available by API.
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🖼️ ImagesFree
Aspect ratio calculator
1920 by 1080 reduces to 16:9, a decimal ratio of 1.7778, and resizing it to 1280 wide keeps it undistorted at 720 high.
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💰 Finance & moneyFree
CAGR calculator
Growing from 100 to 200 over 5 years is a compound annual growth rate of 14.8698%, the steady yearly rate behind a doubling.
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➗ MathFree
Circle calculator
Give one measure of a circle and get all four: a radius of 1 returns a diameter of 2, a circumference of 6.283185 and an area of 3.141593.
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🏗️ Engineering & constructionFree
Ohm's law calculator
Give any two of voltage, current, resistance and power and the other two are worked out: 12 V at 2 A means 6 ohms and 24 watts.
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❤️ Health & fitnessFree
One rep max calculator
Turn a hard set into a one-rep max estimate without testing a true max: 100 for 5 reps gives 116.67 with Epley and 112.5 with Brzycki.
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💰 Finance & moneyFree
Profit margin calculator
Enter a cost and a selling price to get profit, margin and markup side by side: a cost of 80 sold at 100 is a 20% margin but a 25% markup.
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💰 Finance & moneyFree
Simple interest calculator
Find any piece of the simple-interest formula from the other three: 1000 at 5 % for 2 years earns 100 of interest, for a total of 1100.
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🕸️ Web Scraping & MonitoringFree
Download time calculator
Estimate how long a file takes to transfer: 10 MB over a 10 Mbps line takes 8 seconds, not 1, because the speed counts bits and the file counts bytes.
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💰 Finance & moneyFree
Discount calculator
See what a percent-off deal really leaves you to pay: 15% off 19.99 saves 3.00 and brings the price down to 16.99, exact to the cent.
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📅 Dates & timeFree
Time calculator
This time calculator turns 5400 seconds into 1:30:00, tidies overflowing hours and minutes, splits any seconds total into days, hours, minutes and seconds, and…
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❤️ Health & fitnessFree
Body fat calculator
A man 180 cm tall with a 38 cm neck and an 85 cm waist comes out at 16.1% body fat, in the fitness range.
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💰 Finance & moneyFree
Break even calculator
With fixed costs of 10,000, a price of 50 and a variable cost of 30, each unit contributes 20, so you break even at 500 units, or 25,000 in revenue.
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🏠 Home, food & hobbiesFree
Cat age calculator
A 1-year-old cat is about 15 in human years and a 2-year-old about 24; after that, each cat year adds 4.
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🏠 Home, food & hobbiesFree
Dog age calculator
Turn your dog's age into human years on a curve set by its size, where a one-year-old medium dog is 15 and each year after the second adds 4 for small dogs and…
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❤️ Health & fitnessFree
Due date calculator
Estimate your due date from the first day of your last period: a period starting 1 January 2026 with a 28-day cycle gives 8 October 2026, 280 days later, plus…
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🎓 EducationFree
GPA calculator
List each course with its letter grade and credits: an A and a B worth 3 credits each give 21 quality points over 6 credits, a GPA of 3.5.
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❤️ Health & fitnessFree
Heart rate zones
At 30 years old with a resting pulse of 60, your endurance zone runs from 138 to 151 beats per minute.
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❤️ Health & fitnessFree
Ideal weight calculator
For a man 180 cm tall, ideal body weight comes out at 72.6 kg with Robinson, 71.5 kg with Miller and 75.0 kg with Devine.
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❤️ Health & fitnessFree
Ovulation calculator
From the first day of your last period, see your likely ovulation day, fertile window and next period: a period starting 1 March 2026 with a 28-day cycle points…
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🔬 ScienceFree
Speed distance time calculator
Enter any two of speed, distance and time and the third is worked out: a distance of 100 covered in a time of 2 means a speed of 50.
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❤️ Health & fitnessFree
Water intake calculator
At 70 kg, moderate activity and a temperate climate, the estimate is 2818 ml, or 2.82 litres, a day: enter your weight, activity level and climate to get a…
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🧭 Travel & geographyFree
Fuel cost calculator
Enter 100 km, a car that uses 8 L/100 km and fuel at 1.50 per liter: the trip needs 8 liters and costs 12.00.
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⚙️ Developer UtilitiesFree
chmod calculator
chmod 755 is rwxr-xr-x: full rights for the owner, read and execute for the group and everyone else, and 493 as a plain number.
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✍️ Text & AIFree
Extract emails from text
Paste any text and get every email address in it as a clean list: a sentence that mentions hello@example.com gives that address and a count of 1.
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➗ MathFree
Quadratic equation solver
Type a, b and c and get both roots with the discriminant: x² − 3x + 2 = 0 has a discriminant of 1 and the roots 2 and 1.
P
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➗ MathFree
Pythagorean theorem calculator
Enter any two sides of a right triangle and get the third plus the area: legs of 3 and 4 give a hypotenuse of 5 and an area of 6.
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🏗️ Engineering & constructionFree
EV charge time calculator
Estimate how long a top-up takes: a 60 kWh battery charged from 20 to 80 percent on a 7.4 kW wallbox needs about 5.41 hours, drawing 40 kWh from the grid to add…
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💰 Finance & moneyFree
Inflation calculator
Find out what a sum becomes with inflation: at 3% a year, 1000 grows to 1343.92 in 10 years. Leave out any one of the four values, whether starting amount…
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❤️ Health & fitnessFree
A1C converter
An A1C of 7% matches an estimated average glucose of 154.2 mg/dL under the ADA formula. Convert either way to understand a lab report or a lesson, then discuss…
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❤️ Health & fitnessFree
BAC calculator
A 70 kg man who had 2 standard drinks is estimated at 0.0288 % blood alcohol after 2 hours under the Widmark model.
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🔬 ScienceFree
Dew point calculator
Find the temperature at which moisture starts to condense: air at 25 °C and 60% humidity has a dew point of 16.69 °C.
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🧭 Travel & geographyFree
Heat index calculator
At 90 °F and 70% humidity it feels like 105.9 °F. Enter the air temperature and relative humidity to get the official heat index, with the full regression in…
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❤️ Health & fitnessFree
Macro calculator
Split a daily calorie target into protein, carbohydrate and fat: 2000 kcal at 30/40/30 gives 150 g of protein, 200 g of carbs and 66.7 g of fat.
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🔬 ScienceFree
Moon phase calculator
Enter a date and see the Moon's phase: on 1 January 2026 the Moon is 12.421 days old, 93.9% lit and waxing gibbous.
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❤️ Health & fitnessFree
Plate calculator
Type the weight you want on the bar and see exactly which plates go on each side: 100 kg on a 20 kg bar means 40 kg per side, one 25 and one 15.
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🏗️ Engineering & constructionFree
Tire size calculator
A 205/55R16 tire has a 112.8 mm sidewall, a 631.9 mm overall diameter and turns 503.73 times per kilometre: type any metric tire code to get the same four…
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➗ MathFree
Permutation & combination calculator
Find how many ways you can pick r items out of n: choosing 2 of 5 gives 10 combinations when order does not matter, while permutations count every order…
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🏗️ Engineering & constructionFree
Resistor color code calculator
Enter the color bands from left to right and get the value: brown, black, red, gold is 1000 ohms with a 5 % tolerance.
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💰 Finance & moneyFree
ROI calculator
Enter what you invested and what came back: 1000 invested and 1200 returned is a net profit of 200.00 and an ROI of 20.00 %.
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➗ MathFree
Bell number calculator
B(5) is 52: there are 52 ways to split five distinct items into non-empty groups when the order of the groups does not matter.
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➗ MathFree
Equilateral triangle calculator
An equilateral triangle with a side of 2 has a height and an area of about 1.732051 and a perimeter of 6.
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➗ MathFree
Euler triangle OI distance calculator
With a circumradius of 10 and an inradius of 3, the circumcenter and the incenter are about 6.324555 apart, since the squared distance is 40.
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➗ MathFree
Intersecting chords calculator
With AP of 3, PB of 4 and CP of 2, the missing PD is 6, because both chords share the product 12. Enter any three of the four segments of two crossing chords…
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➗ MathFree
Jacobsthal number calculator
Enter a whole number n from 0 to 40 and get the nth Jacobsthal number exactly: the sequence runs 0, 1, 1, 3, 5, 11, 21, 43, and J(40) is 366503875925.
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➗ MathFree
Oblique cylinder calculator
A cylinder with radius 3 and perpendicular height 10 holds about 282.7433 cubic units, however far it leans.
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➗ MathFree
Spherical excess calculator
Enter the three angles of a spherical triangle and get its excess, area and share of the sphere: angles of 1.2, 1.1 and 1 radians on a sphere of radius 1 give…
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➗ MathFree
Subfactorial calculator
Count the derangements of n items, the arrangements where nothing stays in its original place: the subfactorial of 4 is 9, and you also get the chance that a…
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➗ MathFree
Torus sector calculator
A torus with major radius 5 and tube radius 1, swept through half a turn, has a volume of 49.348022 and an outer area of 98.696044.
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➗ MathFree
Tribonacci number calculator
Position 6 of the Tribonacci sequence holds 7: each term is the sum of the three before it, starting from 0, 0 and 1.
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➗ MathFree
Trirectangular tetrahedron calculator
A corner tetrahedron with perpendicular legs of 3, 4 and 5 has a volume of 10 and a total surface of 37.3654.
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💰 Finance & moneyFree
Break even occupancy calculator
With 120,000 of potential rent, 40,000 of operating expenses and 50,000 of yearly debt service, a property must be 75% occupied just to cover its costs, leaving…
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💰 Finance & moneyFree
Capital gains tax estimator
Selling for 50,000 something that cost 30,000, after 400 days, gives a 20,000 long-term gain and, at 15%, a tax of 3,000.
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💰 Finance & moneyFree
DSCR calculator
A property with 50,000 of net operating income and 40,000 of yearly debt service has a DSCR of 1.25 and a 10,000 cushion, enough to pass the usual 1.25 minimum.
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💰 Finance & moneyFree
FHA MIP calculator
On a 300,000 FHA base loan, mortgage insurance comes to 5,250 upfront, 1,650 a year and 137.50 a month at the default rates of 1.75% and 0.55%.
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💰 Finance & moneyFree
FIRE number calculator
Find the portfolio that can cover your spending indefinitely: 40,000 a year at a 4% safe withdrawal rate means a FIRE number of 1,000,000, the familiar 25x…
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💰 Finance & moneyFree
Hard money loan calculator
See the full cost of a short-term hard money loan: 100,000 at 12% a year for 12 months, with 2 points and 500 in fees, costs 14,500, or 14.5% of the loan.
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💰 Finance & moneyFree
Interest capitalization calculator
Rolling 500 of unpaid interest into a 10,000 loan makes the balance 10,500, and at 6% over 60 months the payment rises from 193.33 to 202.99.
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💰 Finance & moneyFree
Mortgage recast calculator
With 200,000 left at 4% over 240 months, a 20,000 lump sum lowers the payment from 1,211.96 to 1,090.76 and saves 9,087.06 in interest, while the rate and the…
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💰 Finance & moneyFree
One percent rule calculator
A 200,000 house renting for 1,600 a month reaches only 0.8%, so it fails the one percent rule; it would need 2,000, a gap of 400.
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💰 Finance & moneyFree
Rule of 78 rebate calculator
Settle a 48-month loan after 18 payments with 3000 of total interest and the Rule of 78 gives you back 1186.22, while the lender keeps 1813.78.
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Call the endpoint
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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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