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📅 Dates & timeFree
Good Friday date calculator
Enter a year and get the date of Good Friday: in 2026 it is Friday 3 April, two days before Gregorian Easter Sunday.
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📅 Dates & timeFree
Gregorian to Minguo ROC year and date converter
Enter a Gregorian date to get its Minguo equivalent; 2024-07-25 becomes 113-07-25, because Minguo year 1 is 1912.
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📅 Dates & timeFree
Cyber Monday date
Cyber Monday 2026 falls on 30 November, four days after Thanksgiving on Thursday 26 November. Enter a year to get the date and the Thanksgiving it is anchored…
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📅 Dates & timeFree
EU daylight saving end date calculator
In 2026, EU summer time ends on Sunday 25 October at 01:00 UTC. Enter a year from 1996 onward to get the last Sunday in October and the exact UTC moment the…
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📅 Dates & timeFree
Super Bowl Sunday date calculator
Enter a year to get the date traditionally tied to Super Bowl Sunday, the second Sunday of February: for 2026 that is 8 February.
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📅 Dates & timeFree
Whit Monday date calculator
Whit Monday 2026 falls on May 25, the day after Pentecost on May 24 and 50 days after Easter on April 5.
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📅 Dates & timeFree
Tabular Day of Ashura date calculator
Enter a Hijri year and get the Gregorian date of 10 Muharram under the tabular Islamic calendar: for 1446 it is Wednesday 17 July 2024.
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📅 Dates & timeFree
Shavuot date calculator by Gregorian year
Enter a Gregorian year and get the civil date of Shavuot, which is 6 Sivan: for 2026 it falls on 22 May, in Hebrew year 5786.
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📅 Dates & timeFree
Gap between two time intervals
Enter two time ranges and get the time that separates them: one ending at 10:30 UTC and another starting at 12:00 at +01:00 are 30 minutes apart, or 1800…
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📅 Dates & timeFree
ISO 8601 duration to seconds converter
Paste an ISO 8601 duration and get its length in seconds: P1Y2M3DT4H5M6S is 36993906 seconds. Years count as 365 days and months as 30, so the answer never…
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📅 Dates & timeFree
Milestone birthday dates calculator from a birth date
Enter a birth date and get the exact dates of milestone birthdays: someone born on 1990-05-17 turns 18 on 2008-05-17, 21 on 2011-05-17 and 65 on 2055-05-17.
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📅 Dates & timeFree
Date of your next round age
Born on 17 August 1994? On 13 August 2026 you are 31, and your next round age, 40, arrives on 17 August 2034.
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📅 Dates & timeFree
Time elapsed percentage calculator
Enter a start, an end and a moment to check, and see how far through the interval it is: 14:00 in a window from 08:00 to 20:00 UTC is 50% of the way.
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📅 Dates & timeFree
Convert an ISO datetime to Windows FILETIME
Enter a date and time with Z or an offset and get the Windows FILETIME count of 100-nanosecond steps since 1 January 1601 UTC: 2025-01-01T00:00:00Z is…
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📅 Dates & timeFree
Military time zone letter
Enter a whole-hour UTC offset and get its military time zone letter and NATO name: +1 is A for Alpha, 0 is Z for Zulu and −1 is N for November.
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📅 Dates & timeFree
Minutes to UTC offset string
Turn a signed number of minutes into a clean UTC offset: 330 becomes UTC+05:30, -75 becomes UTC-01:15 and 60 becomes UTC+01:00.
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📅 Dates & timeFree
Civil Twilight Times Calculator
On 21 June 2026 at latitude 40.7128 and longitude -74.006, civil twilight begins at 08:51 UTC and ends at 01:04 UTC the next day.
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📅 Dates & timeFree
Date as fractional year
Midnight UTC at the start of 2 July 2024 is the decimal year 2024.5, exactly halfway through that leap year.
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📅 Dates & timeFree
Next full moon date calculator
From 25 July 2026, the next full moon falls on 29 July 2026. Enter any date and get the first full moon after it, a stable approximate marker for schedules…
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🏗️ Engineering & constructionFree
Maximum Power Transfer Calculator
A 12 V source with 6 Ω of internal resistance gives at most 6 W, into a 6 Ω load at 6 V and 1 A. Enter the open-circuit voltage and the source resistance to get…
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🏗️ Engineering & constructionFree
Two-node voltage analysis calculator
A 1 kΩ branch enters as 0.001 S: give the three branch conductances and the current entering each node, and get both node voltages of a two-node resistive…
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🏗️ Engineering & constructionFree
Series-parallel resistor network calculator
A 100 Ω resistor, a 220 Ω and 330 Ω parallel pair and a 1 kΩ resistor in series come to 1232 Ω. Describe series and parallel groups nested inside one another…
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🏗️ Engineering & constructionFree
Watt-hours from power and time calculator
A 60 W device running for 8 hours uses 480 watt-hours, or 0.48 kWh: enter the average power and the hours, using decimals such as 1.5 for ninety minutes, and…
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🏗️ Engineering & constructionFree
NTC thermistor temperature from resistance calculator
A 10 kΩ NTC that measures exactly 10 kΩ is at its 25 °C reference, which is 298.15 K or 77 °F. Enter the measured resistance, the nominal value and beta to read…
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🏗️ Engineering & constructionFree
Six-band resistor color code calculator with temperature coefficient
Brown-black-black-red-brown-brown is a 10,000 Ω resistor with ±1 % tolerance and a 100 ppm/°C temperature coefficient.
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🏗️ Engineering & constructionFree
RC Discharging Voltage at Time Calculator
12 V on a 100 µF capacitor discharging through 10 kΩ keeps only about 13.5 % after 2 seconds, two time constants.
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🏗️ Engineering & constructionFree
Supercapacitor backup time calculator
A 100 F bank charged to 5.4 V and drained to 3 V keeps a 10 W load running for about 90.72 seconds at a converter efficiency of 0.9.
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🏗️ Engineering & constructionFree
Coupled inductors in series calculator
Coils of 0.01 H and 0.04 H with 0.006 H of mutual inductance total 0.062 H in series aiding and 0.038 H in series opposing.
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🏗️ Engineering & constructionFree
Parallel plate capacitor area calculator
A 1 nF target with plates 1 mm apart and a dielectric constant of 2.2 needs a square overlap just over 22 cm on each side.
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🏗️ Engineering & constructionFree
Toroid inductance calculator
Find the ideal inductance of a toroidal coil, for example 100 turns on a core with a relative permeability of 2000, a 0.0001 m² cross-section and a 0.1 m…
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🏗️ Engineering & constructionFree
AC form factor and crest factor calculator
A 120 V RMS sine with a rectified average of 108.037 and a peak of 169.706 gives a form factor of 1.1107 and a crest factor of 1.4142.
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🏗️ Engineering & constructionFree
Impedance polar to rectangular converter
An impedance of 50 Ω at 30° splits into 43.3012701892 Ω of resistance and 25 Ω of inductive reactance.
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🏗️ Engineering & constructionFree
Three-phase power calculator
400 V between lines, 32 A per line and a power factor of 0.85: enter those three figures and get the real power of a balanced three-phase load in watts and…
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🏗️ Engineering & constructionFree
Peak voltage from RMS calculator for sine waves
A 10 V RMS sine wave peaks at about 14.142 V and spans about 28.284 V peak to peak: enter the RMS voltage and get both, multiplied by the square root of two.
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🏗️ Engineering & constructionFree
Series diode voltage drop calculator
Three diodes dropping 0.7, 0.7 and 0.65 V use 2.05 V, so a 12 V supply leaves 9.95 V for the load.
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🏗️ Engineering & constructionFree
LED resistor by color calculator
A red LED on 5 V at 20 mA needs 150 Ω, and you never have to look up its forward voltage: choose the color, enter supply and current, and get the resistor, its…
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🏗️ Engineering & constructionFree
Common Emitter Voltage Gain Calculator
With 4700 Ω on the collector, 100 Ω of unbypassed emitter resistance and 0.04 S of transconductance, a common-emitter stage gains -37.6 V/V, inverting the…
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🏗️ Engineering & constructionFree
MOSFET Drain Current in Saturation Calculator
A gate overdrive of 2.5 V and a k of 0.004 A/V² give 12.5 mA of drain current. Enter those two values and get the ideal square-law current in amperes and…
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🏗️ Engineering & constructionFree
Rectifier peak inverse voltage calculator
On a 12-0-12 V center-tapped rectifier each diode must block twice the peak of one 12 V half-winding, while bridge and half-wave diodes see a single peak.
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🏗️ Engineering & constructionFree
BCD to binary converter
Decode packed 8421 BCD into its decimal value and plain binary: 0010 0101 1001 is 259, which is 100000011 in binary.
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🏗️ Engineering & constructionFree
Binary division calculator
Divide two unsigned binary numbers and get the exact quotient and remainder with every restoring step: 110101 divided by 101 gives 1010, remainder 11.
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🏗️ Engineering & constructionFree
Ratio to gain dB calculator
A voltage ratio of 2 is a gain of about 6 dB. Say whether your ratio compares voltages or powers and the calculator applies 20 or 10 times the logarithm, so the…
K
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🏗️ Engineering & constructionFree
Binary Counter Maximum Count Calculator
A counter with 4 flip-flop stages has 16 states and counts from 0 to 15, so its largest value is one less than its modulus.
K
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🏗️ Engineering & constructionFree
Binary decoder outputs calculator
Four input lines make a 4-to-16 decoder: sixteen outputs, and a block that starts at 4096 ends at 4111, or 0x1000 to 0x100F.
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🏗️ Engineering & constructionFree
Bit Rotate Calculator
Rotating 150 three places left in an 8-bit register gives 180, or 10110100 in binary: bits that fall off one end come back at the other.
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🏗️ Engineering & constructionFree
Buck-boost converter duty cycle calculator
Turning a 12 V supply into a −5 V rail needs a duty cycle of 0.294118, about 29.4118% of each switching period.
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🏗️ Engineering & constructionFree
Charge pump voltage calculator
Three doubler stages driven by a 12 V peak wave give an ideal 72 V with no load, six times the input peak.
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🏗️ Engineering & constructionFree
Clock frequency and period calculator
A 100 MHz clock has a period of 10 ns, and a 20 ns period means 50 MHz. Enter either the frequency or the period, plus an optional interval to count cycles, and…
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🏗️ Engineering & constructionFree
555 astable resistor and capacitor calculator
Ask for 1000 Hz at 60 % duty and it picks a 5.6 nF capacitor from the E12 series, then works out both timing resistors around it for a classic 555 astable.
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🏗️ Engineering & constructionFree
Peukert Battery Capacity Calculator for Lead-Acid Batteries
A 100 Ah battery rated at 20 hours was measured at only 5 A, so a heavier load gets fewer amp-hours out of it.
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🏗️ Engineering & constructionFree
Solar array energy sizing calculator
Covering 30 kWh a day with 5 peak sun hours and 20 % system losses takes a 7500 W panel array. Enter daily energy, sun hours and losses to get the exact…
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🏗️ Engineering & constructionFree
Junction temperature calculator
A part dissipating 2.5 W through 40 °C/W runs 100 °C above ambient, so at 25 °C its junction reaches 125 °C.
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🏗️ Engineering & constructionFree
Parallel conductor ampacity calculator
Three identical conductors rated 200 A each add up to 600 A, and a 0.8 adjustment factor brings that to 480 A.
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🏗️ Engineering & constructionFree
Resistive attenuator pad calculator
A 6 dB pi pad for a 50 Ω system cuts the voltage by a factor of about 2 using two equal shunt resistors and one series resistor, with every value labeled by its…
B
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🏗️ Engineering & constructionFree
Return loss to SWR calculator for antenna tuning
Turn an antenna analyzer reading into SWR without logarithms: a return loss of 20 dB means a reflection coefficient of 0.1 and an SWR of about 1.2.
K
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🧭 Travel & geographyFree
Spherical law of cosines distance calculator
Find the distance between two points with the spherical law of cosines: from 40.7128, -74.006 to 51.5074, -0.1278 the central angle is 50.09421156°, or…
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🧭 Travel & geographyFree
Nearest point on a great-circle segment
For a point at latitude 30, longitude 45 and a leg from 0, 0 to 0, 90, the closest point is 0, 45: halfway along and 30° of arc away.
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🧭 Travel & geographyFree
Earth arc length from central angle calculator
A 90° central angle on a sphere of 6371008.8 m, the mean Earth radius, is a quarter of the circumference: just over ten thousand kilometres of surface.
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🧭 Travel & geographyFree
Geodesic segment length calculator
Measure the shortest path over the Earth's surface between two coordinates: from 40.7128, -74.006 to 51.5074, -0.1278 it is 5570.229874 km, shown in metres and…
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🧭 Travel & geographyFree
True to magnetic bearing calculator
A true bearing of 90° with 7.5° east declination becomes 82.5° magnetic: enter the bearing and the signed declination, and the result is wrapped into the…
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