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📅 Dates & timeFree
JavaScript timestamp to ISO 8601 converter
Paste a JavaScript timestamp in milliseconds and get the exact UTC date and time: 0 becomes 1970-01-01T00:00:00.000Z.
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📅 Dates & timeFree
Swatch Internet Time
Turn any date and time into Swatch Internet Time: 11:00 UTC is @500.00, noon in Biel. The day has 1000 beats of 86.4 seconds each, counted from midnight in Biel…
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📅 Dates & timeFree
Unix seconds to ISO 8601
Paste a Unix timestamp in seconds and get the exact UTC date and time in ISO 8601: 1800000000 becomes 2027-01-15T08:00:00Z.
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📅 Dates & timeFree
Approximate equation of time
On 11 February 2024, day 42 of the year, a sundial runs about fourteen and a half minutes behind a mean clock.
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📅 Dates & timeFree
Moon age in days calculator for any date
On 25 July 2026 the Moon is about 10 days old, counted from the previous new moon. Enter any date and see where it sits in the lunar cycle, a steady estimate…
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🏗️ Engineering & constructionFree
Power from current and resistance
Two amperes through 10 Ω dissipate 40 watts of heat. Enter the current and the resistance to get the power the resistor turns into heat, plus the voltage across…
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🏗️ Engineering & constructionFree
Resistance from power and voltage calculator
A load using 60 W at 120 V has an operating resistance of 240 Ω. Enter the voltage and the real power from a label or a measurement to get the ohms when an…
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🏗️ Engineering & constructionFree
Voltage drop percentage calculator
120 V at the source and 115.8 V at the load mean a 4.2 V drop, or 3.5 %, which fails the default 3 % limit.
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🏗️ Engineering & constructionFree
Voltage from power and current calculator
A heater drawing 1500 W at 12.5 A runs on 120 V: enter the watts and amps you measured and get the voltage, worked out as power divided by current.
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🏗️ Engineering & constructionFree
Charge from current and time calculator
A current of 2 A flowing for 5 seconds moves 10 coulombs: charge is simply current times time. Enter the current in amperes and the elapsed time in seconds to…
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🏗️ Engineering & constructionFree
Kirchhoff voltage law calculator
A 12 V source feeding a 5 V drop and one unknown drop leaves 7 V for the unknown. List the voltages around one closed loop, tag each as rise or drop, leave one…
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🏗️ Engineering & constructionFree
Norton equivalent calculator
A 12 V source behind 6 Ω becomes a 2 A current source with 6 Ω in parallel. Enter the source voltage and series resistance to get the Norton current, sign…
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🏗️ Engineering & constructionFree
Resistor power dissipation calculator
A 100 Ω resistor carrying 100 mA turns 1 W into heat, so with the default safety margin you should fit a 2 W part.
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🏗️ Engineering & constructionFree
EIA-96 SMD resistor code calculator
An SMD resistor marked 25C is 17.8 kΩ: the 25 points to 178 in the 96-row E96 table and the C multiplies by one hundred.
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🏗️ Engineering & constructionFree
Two resistor parallel calculator
1000 Ω in parallel with 2200 Ω gives 687.5 Ω: the product divided by the sum. Enter two resistances in ohms and get the equivalent, which always comes out lower…
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🏗️ Engineering & constructionFree
Voltage divider resistor calculator
Going from 12 V down to 5 V with 10000 Ω on top, the lower resistor must be 7142.85714286 Ω. Enter the input voltage, the target output and the upper resistor…
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🏗️ Engineering & constructionFree
Capacitance to capacitor code calculator
A 100 nF capacitor is marked 104, ten followed by four zeros in picofarads. Type a value with its unit to get the three-digit code and how it reads; values the…
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🏗️ Engineering & constructionFree
NTC thermistor beta resistance calculator
A 10 kΩ NTC with a beta of 3950 K, rated at 25 °C, drops below 4 kΩ at 50 °C. Enter the nominal resistance, beta and the temperature you need to get the…
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🏗️ Engineering & constructionFree
Pull-up resistor current calculator
A 10 kΩ pull-up on a 5 V supply draws 0.5 mA whenever the line is held low, and the resistor dissipates 0.0025 W.
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🏗️ Engineering & constructionFree
Five-band resistor color code calculator
Brown-black-black-red-brown reads as 10 kΩ with ±1 % tolerance, so the part may measure anywhere from 9,900 to 10,100 Ω.
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🏗️ Engineering & constructionFree
Resistor tolerance range calculator
A 1000 Ω resistor at ±5 % may measure anywhere from 950 to 1050 Ω, a ±50 Ω band and a 100 Ω span. Enter the nominal value and tolerance to get the limits for…
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🏗️ Engineering & constructionFree
Two capacitor series calculator
10 and 20 in series give about 6.6667 in the same unit: the product, 200, divided by the sum, 30. Enter two capacitor values and get the equivalent with each…
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🏗️ Engineering & constructionFree
Capacitive voltage divider
10 V across two equal 1 nF capacitors leaves 5 V on the lower one, a ratio of 0.5 and about −6 dB.
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🏗️ Engineering & constructionFree
Capacitor ESR power loss calculator
With 2.5 A of RMS ripple through 0.03 Ω of ESR, a capacitor turns 0.1875 W into heat, or 675 J every hour.
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🏗️ Engineering & constructionFree
Capacitor dielectric field strength calculator
With 1200 V across 0.5 mm, the field is 2.4 kilovolts per millimeter, only 24 % of a 10 kilovolt-per-millimeter dielectric, leaving 3800 V of headroom up to…
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🏗️ Engineering & constructionFree
RC charging voltage at time calculator
With 1 kΩ, 1 µF and a 5 V supply, the capacitor reaches about 63.2 % of the supply after 1 ms, exactly one time constant.
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🏗️ Engineering & constructionFree
RC snubber design calculator
A 24 V relay cutting 2 A through a 1 mH coil needs a 12 Ω resistor and a matching capacitor across the contact to absorb the 2 mJ released at switch-off.
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🏗️ Engineering & constructionFree
Series capacitor voltage sharing calculator
Across 400 V, a string of 100, 220 and 100 µF capacitors leaves the 220 µF part with the smallest share, and every part stays within its rating.
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🏗️ Engineering & constructionFree
AC real power calculator
Multiply RMS voltage, RMS current and power factor to get the real power an AC load turns into work: 230 V at 10 A with a power factor of 0.85 gives 1,955 W out…
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🏗️ Engineering & constructionFree
Air core solenoid inductance calculator
Estimate a single-layer air-core coil with L = μ₀N²A/l: doubling the turns makes the inductance four times larger, while doubling the coil length halves it.
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🏗️ Engineering & constructionFree
Coupling coefficient calculator
Coils of 10 mH and 40 mH sharing 6 mH of mutual inductance have a coupling coefficient of 0.3, or 30 %.
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🏗️ Engineering & constructionFree
Series RLC impedance calculator
100 Ω, 0.1 H and 1 µF in series at 1000 Hz behave inductively, because the coil's reactance outweighs the capacitor's.
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🏗️ Engineering & constructionFree
Inductance from reactance calculator
A reactance of 31.416 Ω at 50 Hz calls for a coil of about 0.1 H. Enter the ohms your design needs and the signal frequency, and the calculator divides by two…
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🏗️ Engineering & constructionFree
Inductor current ripple calculator
With 12 V across a 0.0001 H inductor, a duty cycle of 0.4 and 100 kHz switching, the current swings 0.48 A peak to peak.
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🏗️ Engineering & constructionFree
RF choke impedance calculator
At 100 MHz, a 1 µH choke presents 628.318530718 Ω to the RF signal, which counts as moderate blocking.
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🏗️ Engineering & constructionFree
Sine average voltage calculator
A sine wave of 10 V peak has an average rectified value of about 6.366 V, two over pi times the peak.
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🏗️ Engineering & constructionFree
VRMS from peak voltage calculator
A 170 V peak sine wave equals about 120.2 V RMS: enter the peak voltage and get the RMS value by dividing by the square root of two, plus the crest factor and…
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🏗️ Engineering & constructionFree
Series RL impedance calculator
A 100 Ω resistor in series with 0.1 H at 50 Hz gives about 104.8 Ω of impedance, with current lagging by about 17.4°.
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🏗️ Engineering & constructionFree
Line to phase voltage calculator
A 400 V three-phase supply gives loads about 230 V from line to neutral: enter either the line or the phase voltage of a balanced wye system and get the other…
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🏗️ Engineering & constructionFree
Phase shift to time delay calculator
At 1000 Hz, a 90° phase shift is a delay of 0.00025 seconds, one quarter of the period. Convert either way between degrees and seconds for any signal frequency…
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🏗️ Engineering & constructionFree
RLC resonance Q factor calculator
A series RLC circuit with 10 Ω, 10 mH and 1 µF has a Q of 10 and resonates at 10000 rad/s. Enter resistance, inductance and capacitance to see how sharply a…
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🏗️ Engineering & constructionFree
Shockley diode equation calculator
At 0.6 V, with a saturation current of 1 pA and a thermal voltage of 25.85 mV, the Shockley equation gives about 12 mA through an ideal diode.
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🏗️ Engineering & constructionFree
BJT Voltage Divider Bias Calculator
Find the operating point of a common-emitter NPN stage with divider bias: with 12 V, a 47 kΩ and 10 kΩ divider and a beta of 100, the base sits at about 2 V…
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🏗️ Engineering & constructionFree
Full-wave rectifier output calculator
A 12 V half-winding peak minus one 0.7 V diode drop gives 11.3 V peak at the load and a DC average of 7.193803 V.
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🏗️ Engineering & constructionFree
Impedance from R and X calculator
Resistance 3 Ω and reactance 4 Ω give an impedance of 5 Ω, plus its phase angle in degrees and radians.
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🏗️ Engineering & constructionFree
LED series string calculator
On a 12 V rail, three 3.2 V LEDs at 20 mA fit in one string with a 120 Ω resistor: enter supply, LED voltage and current to get the maximum count, the resistor…
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🏗️ Engineering & constructionFree
Linear regulator power calculator
Stepping 12 V down to 5 V at 0.5 A turns 3.5 W into heat: enter input, output and load current to see the regulator's dissipation, the power that reaches the…
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🏗️ Engineering & constructionFree
Zener diode power calculator
A 5.1 V Zener carrying 20 mA dissipates 0.102 W, which is 20.4 % of a 0.5 W rating. Enter the Zener voltage, its current in amperes and the data-sheet rating to…
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🏗️ Engineering & constructionFree
Aliasing frequency calculator
Find where a sampled tone really shows up: a 1,000 Hz tone sampled at 800 Hz has a Nyquist limit of 400 Hz and appears at 200 Hz.
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🏗️ Engineering & constructionFree
Battery C rate calculator
Convert between C rate and current for any battery: a 100 Ah battery at 0.5C means 50 A and an ideal two hours.
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🏗️ Engineering & constructionFree
Battery depth of discharge calculator
Turn a chosen depth of discharge into usable amp-hours, watt-hours and an estimated cycle life: a 400 Ah, 48 V bank at 60 % gives 240 Ah and 11,520 Wh, and a…
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🏗️ Engineering & constructionFree
Binary multiplication calculator
Multiply two binary numbers and see every shift-and-add row: 1011 times 110 gives 1000010, built from one skipped row and two added ones.
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🏗️ Engineering & constructionFree
Binary to BCD converter
Turn a binary number into the 8421 BCD pattern a multi-digit display needs: 101010 is 42, which becomes the groups 0100 and 0010.
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🏗️ Engineering & constructionFree
Bits Needed for Values Calculator
Find the smallest binary width that fits your values: 1000 distinct states need 10 bits, which give 1024 patterns.
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🏗️ Engineering & constructionFree
Bitwise XOR calculator
Combine two integers bit by bit with exclusive OR: 12 XOR 10 gives 6, because 1100 and 1010 differ in exactly two places.
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🏗️ Engineering & constructionFree
Boolean expression truth table calculator
Type a logic expression with AND, OR and NOT and get its complete truth table: A AND B gives four rows, with 1 only where both inputs are 1.
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🏗️ Engineering & constructionFree
Boost converter duty cycle calculator
Stepping 5 V up to 12 V takes a duty cycle of about 0.5833 and gives a voltage gain of 2.4, and this calculator works out both from your two voltages.
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🏗️ Engineering & constructionFree
Switching converter input current calculator
A 50 W load fed from 12 V at 90 % efficiency draws just over four and a half amperes on average, more than a lossless estimate.
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🏗️ Engineering & constructionFree
DAC output voltage calculator
An 8-bit converter with a 5 V reference turns code 128 into exactly 2.5 V. Enter the digital code, the reference voltage and the resolution to get the output…
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🏗️ Engineering & constructionFree
dB to gain ratio calculator
Twenty decibels is a voltage ratio of 10 but a power ratio of 100, so choosing the right kind matters.
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