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🏗️ Engineering & constructionFree
Gray code to binary calculator for encoder values
Gray 0111 decodes to binary 0101, which is 5 in decimal. Paste the word your encoder reports, with or without a 0b prefix, and get ordinary binary with the same…
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🏗️ Engineering & constructionFree
Johnson counter states calculator
Four flip-flops wired as a Johnson counter give 8 unique states, twice the number of stages. Enter the stage count to get that figure, the plain ring count and…
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🏗️ Engineering & constructionFree
Monostable timer period calculator
A 47 kΩ resistor and a 10 µF capacitor give a 0.517 s pulse (517 ms) with the usual factor of 1.1.
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🏗️ Engineering & constructionFree
MOSFET switching loss calculator
Hard-switching 48 V and 10 A with 50 ns and 40 ns edges at 100 kHz dissipates 2.16 W in the MOSFET.
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🏗️ Engineering & constructionFree
555 astable frequency calculator
With RA at 1000 Ω, RB at 10000 Ω and C at 1 µF, a 555 astable has a timing term of 21000 Ω, RA plus twice RB.
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🏗️ Engineering & constructionFree
Op-amp buffer follower calculator
Put 2.5 V on the non-inverting input of an op-amp follower and 2.5 V comes out: a gain of one and no inversion.
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🏗️ Engineering & constructionFree
Op-amp full-power bandwidth calculator
An op-amp with a 6.283 V/µs slew rate can swing 10 V peak up to 100 kHz before the sine turns into a triangle.
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🏗️ Engineering & constructionFree
Op-amp integrator calculator
2 V into 10 kΩ and 1 µF makes an ideal op-amp integrator ramp at −200 V/s, with a 10 ms time constant.
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🏗️ Engineering & constructionFree
Product of sums maxterm calculator
List the truth-table rows where the output is 0 and get the canonical product of sums: rows 0, 2, 5 and 7 for A, B and C become ΠM(0, 2, 5, 7), written out as…
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🏗️ Engineering & constructionFree
PWM resolution bits calculator
A 72 MHz timer running PWM at 20 kHz has 3,600 counts per period, which means 11 whole bits of duty resolution.
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🏗️ Engineering & constructionFree
Signed magnitude representation calculator
Negative 37 at eight bits is 10100101: the first bit holds the sign and the other seven hold the magnitude.
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🏗️ Engineering & constructionFree
Transistor power dissipation calculator
10 V across collector and emitter at 0.5 A means the transistor turns 5 W into heat. Enter Vce and Ic to get collector dissipation in watts, the figure to check…
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🏗️ Engineering & constructionFree
UART frame time calculator
At 115200 baud with 8N1, each frame is 10 bits, so the line carries at most 11520 frames per second.
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🏗️ Engineering & constructionFree
XOR checksum calculator
Turn the bytes of a frame into its one-byte XOR checksum: a five-byte message comes out as 66, written 0x42 in hexadecimal and 01000010 in binary.
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🏗️ Engineering & constructionFree
Solar battery bank sizing calculator
50 Ah a day for 3 days of autonomy at 50 % depth of discharge needs a 300 Ah bank: 150 Ah of usable charge, doubled so no more than half is ever drawn.
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🏗️ Engineering & constructionFree
Wire gauge selection calculator
For 20 A over a 30 m run at 120 V with a 3 % limit, copper needs AWG 9. Enter current, one-way length, voltage, allowed drop, material and circuit type to get…
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🏗️ Engineering & constructionFree
Fuse I²t melting calculator
A 500 A fault lasting 0.02 seconds delivers 5000 A²s, 125 % of a 4000 rating, so the melting threshold is exceeded by 1000.
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🏗️ Engineering & constructionFree
Thermal resistance stack calculator
1.2, 0.3 and 4.5 °C/W in series make 6 °C/W, so 18 W raises the junction by 108 °C and, at 25 °C ambient, it reaches 133 °C.
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🏗️ Engineering & constructionFree
Wire ampacity derating calculator
A 30 A wire rated 90 °C, in 40 °C air with six current-carrying conductors, drops to 21.84 A. Enter the table rating, ambient temperature, insulation column and…
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🏗️ Engineering & constructionFree
dB attenuation calculator
An attenuation of 6 dB leaves about half the voltage and about a quarter of the power. Enter one figure in decibels from a pad, a cable table or a filter sheet…
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🏗️ Engineering & constructionFree
Power bank phone charges calculator
A 20000 mAh power bank at 85 % efficiency delivers about 17000 mAh: four full charges of a 4000 mAh phone, with a quarter of a charge to spare.
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🏗️ Engineering & constructionFree
SWR from reflection coefficient calculator
A reflection coefficient of 0.2 means an SWR of 1.5 and about 14 dB of return loss. Enter the reflection magnitude or your forward and reflected power readings…
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🧭 Travel & geographyFree
Haversine great-circle distance
Measure the great-circle distance between two coordinates with the formula shown next to the result: New York to London comes out at 5570.229874 km, with…
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🧭 Travel & geographyFree
Central angle between two latitude longitude points
New York and London are 50.094211560061° apart as seen from the centre of the Earth, or 0.874308927913665 radians.
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🧭 Travel & geographyFree
Nearest point on polyline
For the point 40.73, -74.01 and a three-vertex route, the closest spot on the line is 40.7227030704, -73.9972969296, on the second segment.
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🧭 Travel & geographyFree
Point to infinite great-circle line distance calculator
The point at latitude 10, longitude 20 is 10° of arc, or 1111.950802335 km, from the great circle through 0, 0 and 0, 90.
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🧭 Travel & geographyFree
Bearing to 32-point compass box
A bearing of 11.25° is NbE, North by East, one of the 32 points of the classical compass rose. Enter any heading in degrees to get its traditional label, the…
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🧭 Travel & geographyFree
Final bearing at destination
Following the great circle from 51.5074, -0.1278 to 40.7128, -74.006, you arrive heading 231.212617°, or SW.
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🧭 Travel & geographyFree
Grid bearing from true
Convert a true bearing to a grid bearing by removing the meridian convergence; a true 45° with 1.25° of convergence gives a grid 43.75°, and the reverse back to…
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🧭 Travel & geographyFree
Polar coordinate plane distance
Two points at radius 3, angle 0° and radius 4, angle 90° are exactly 5 apart: the law of cosines gives the straight-line distance between polar points without…
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🧭 Travel & geographyFree
Relative bearing from heading
See where a target lies from your bow: with a heading of 350° and the target at 45° true, the relative bearing is 55°, forward on the starboard side.
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➗ MathFree
Cube surface area calculator
Enter the edge of a cube and get the area of all six faces: an edge of 2 cm gives 24 cm². The result stays in your unit, squared, which is what you need to…
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🧭 Travel & geographyFree
Quadrant bearing to azimuth converter
Turn a quadrant bearing into a whole-circle azimuth without remembering which quadrants add or subtract: S 60 W becomes 240°, measured clockwise from north.
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➗ MathFree
Cube volume, surface area and space diagonal from edge length
From one edge length, get the cube's volume, total surface area and space diagonal at once: an edge of 3 gives 27, 54 and 5.196152.
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🧭 Travel & geographyFree
Densify a geodesic line with evenly spaced latitude/longitude vertices
Give a line and a maximum gap, and extra points are inserted along each segment: with a 60000 m limit, a route of three points becomes five, every gap under 60…
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🧭 Travel & geographyFree
Minimum bounding rectangle calculator for 2D points
For the points (-2, 3), (4, -1), (1, 5) and (0, 2), the smallest upright rectangle runs from (-2, -1) to (4, 5), with width 6, height 6 and area 36.
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🧭 Travel & geographyFree
Convex hull of points
For the points (0, 0), (4, 0), (4, 3), (0, 3) and (2, 1), the convex hull is the rectangle formed by the first four, and (2, 1) stays inside.
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🧭 Travel & geographyFree
Polygon edge bearings
For the square (0, 0), (0, 1), (1, 1), (1, 0), the four edges head 90°, 0°, 270.008726° and 180° from true north, with the last edge closing back to the start.
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🧭 Travel & geographyFree
Polygon convexity test
The rectangle (0, 0), (4, 0), (4, 3), (0, 3) is convex: every corner turns the same way, counterclockwise.
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🧭 Travel & geographyFree
Spherical excess polygon area
Get the real surface area of a polygon defined by GPS corners: a one-degree box at the equator covers 12,364.031909 km².
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➗ MathFree
Cube volume calculator
Enter the side of a cube and get its volume, the side multiplied by itself three times: a side of 3 gives 27, in your unit cubed.
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➗ MathFree
Cubic feet of a cylinder
Enter a cylinder's radius and height in feet and get its capacity in cubic feet: a radius of 2 ft and a height of 5 ft hold 62.831853 cubic feet.
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🧭 Travel & geographyFree
Geographic radians to degrees converter for coordinates
A latitude of 0.7105724077059474 radians is 40.7128° in decimal degrees. Choose latitude or longitude, enter the radian value and get degrees checked against…
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🧭 Travel & geographyFree
Degrees decimal minutes to decimal degrees converter
Type 40° 26.767′ N and get 40.44611666666667: the minutes are divided by 60 and added to the degrees, and south or west makes the result negative, ready for a…
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🧭 Travel & geographyFree
Planar polygon perimeter
Corners at easting 500000 to 500100 and northing 4649776 to 4649876 give a perimeter of 400, with four edges of 100, in the same units as your grid.
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🧭 Travel & geographyFree
Wrap longitude to 0–360°
A western longitude of -74.006° becomes 285.994° on the 0–360 axis that climate and ocean datasets use.
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🧭 Travel & geographyFree
UTM latitude band letter
Latitude 40.7128 is band T, which covers 40° to 48° north. Enter a latitude between 80° south and 84° north and get its letter, the edges of that band and…
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🧭 Travel & geographyFree
Web Mercator ground resolution calculator
At the equator and zoom 0, one pixel of a standard web map covers 156,543.033928 m and a full 256-pixel tile 40,075,016.6856 m.
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➗ MathFree
Largest cube in a cylinder
Find the biggest cube that fits inside a cylinder: with a radius of 2 and a height of 5, the edge is 2.828427 and the volume 22.627414.
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🧭 Travel & geographyFree
Albers equal-area projection calculator
Enter Washington (38.9072, −77.0369) and standard parallels at 29.5° and 45.5°, and you get its X and Y in metres on an equal-area cone.
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🧭 Travel & geographyFree
Geohash child cells
The geohash u4pruyd splits into 32 children, from u4pruyd0 to u4pruydz, each one character longer and together covering the whole parent cell.
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🧭 Travel & geographyFree
Hammer projection calculator
Turn a latitude and longitude into x and y on a Hammer equal-area world map: 40.7128 and -74.006 with radius 1 land at x -1.0184 and y 0.728045, centered on the…
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🧭 Travel & geographyFree
Point to hex grid cell
Find which hexagon a flat-map point falls in: with hexagons measuring 10 from center to corner, the point at x 18 and y 9 lands in column 1, row 0, ready for…
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🧭 Travel & geographyFree
Orthographic projection calculator
Viewed from far out in space above 0, 0, the point 40.7128, -74.006 lands at x -0.7286473179 and y 0.6522677564 on a globe disk of radius 1, on the visible…
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🧭 Travel & geographyFree
Easting and northing to OSGB grid reference converter
Easting 530000 and northing 180000 become TQ 300 800 at three digits per coordinate, the usual 100 m reference on British maps.
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🧭 Travel & geographyFree
Plate Carrée projection calculator
Latitude 40.7484 and longitude -73.9857 become x -73.9857 and y 40.7484, still in degrees. On the Plate Carrée map, longitude is the horizontal axis and…
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🧭 Travel & geographyFree
Shorten Plus Code
Near the reference point 47.5, 8.5, the full Plus Code 8FVC9G8F+6X shortens to 9G8F+6X: the first four characters go, because the nearby area already supplies…
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🧭 Travel & geographyFree
S2 cube face from lat/lon
Find which of the six S2 cube faces a point falls on: San Francisco at 37.7749, -122.4194 lands on face 4, the -Y face, at u -0.918061185048 and v…
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🧭 Travel & geographyFree
Sinusoidal projection calculator
Place a point on the equal-area sinusoidal map: 45° north and 30° east on a unit sphere become x 0.3702402448 and y 0.7853981634.
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🧭 Travel & geographyFree
US State Plane zone finder
Find the State Plane zone for a US location from its state and coordinates: 34.0522, -118.2437 in California falls in California V, FIPS zone 0405.
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