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📅 Dates & timeFree
Days Until Christmas Calculator
From 1 December 2026 there are 24 days to go until Christmas. Enter any date and get the exact count to the next 25 December, rolling over to the following year…
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💰 Finance & moneyFree
Container Loading Calculator
Check a load before freight is booked: a container measuring 1200 × 235 × 239 inside holds 700 boxes of 60 × 40 × 30, stacked 20 long, 5 wide and 7 high.
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🎓 EducationFree
Classroom spacing calculator
Find out how many students fit in a room at the spacing you need: a 10 by 8 floor with each learner claiming a 2 by 2 square seats 20, in 5 rows of 4 seats.
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🎓 EducationFree
College GPA calculator
Get your credit-weighted college GPA on the 4.0 scale from course grades and credit hours: four courses adding up to 38.8 quality points over 11 credits give a…
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🏗️ Engineering & constructionFree
Crosstalk calculator
A 3.3 V signal 0.05 m from a neighbouring cable, with a coupling factor of 0.0002, induces 0.0132 V on it, about -47.96 dB.
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🏠 Home, food & hobbiesFree
Chord transposer
Raise C Am F G by 2 semitones and you get D Bm G A, a major second up. Paste one chord or a whole progression, choose the shift up or down, and print a chart…
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🖼️ ImagesFree
CSS aspect ratio padding calculator
Get the padding-top percentage for a responsive box: height divided by width, times 100. A 1600 × 900 video, a 160 × 90 thumbnail and a 16 × 9 design frame all…
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📅 Dates & timeFree
Days Until Valentine's Day Calculator
Planning a dinner, a gift or a campaign? From 1 February 2026 there are 13 days left until Valentine's Day.
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🏗️ Engineering & constructionFree
Duty cycle calculator
A 2 ms pulse in a 10 ms period is a 20 % duty cycle, with 8 ms off. Enter both times in the same unit, with no voltage needed; a pulse wider than its period is…
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🏠 Home, food & hobbiesFree
Delay and reverb times calculator
At 120 BPM an eighth-note delay is 250 ms and a whole-note reverb tail is 2000 ms, with a 62.5 ms pre-delay to start.
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🏠 Home, food & hobbiesFree
Diamond Weight Calculator
A round diamond measuring 6.5 by 6.5 by 4 mm weighs an estimated 1.0309 carats. Pick one of ten cut shapes, enter three measurements and get a weight even when…
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🏠 Home, food & hobbiesFree
Dating theory
At 30, the half-your-age-plus-seven rule gives a partner range of 22 to 46, a 24-year window. Enter a whole-number age to see both bounds of this folk rule; it…
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📈 SEOFree
Engagement rate calculator
Enter the interactions you counted and the follower total, and 450 interactions on 10,000 followers give an engagement rate of 4.5%.
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➗ MathFree
DPMO calculator
Twenty-five defects in 200 assemblies with 5 inspection points each give 25,000 DPMO: defects scaled to a million chances to fail.
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🎬 VideoFree
Frames to timecode
At 30 frames per second, frame 1,800 is exactly one minute, written 00:01:00:00, and frame zero is always 00:00:00:00.
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🎓 EducationFree
Grade curve calculator
Bring a class to the mean you choose: if four raw marks average 65 and your target is 80, every mark is multiplied by 80 over 65, so the ranking stays the same.
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⚙️ Developer UtilitiesFree
Hamming code calculator
The data word 1011 encodes to 0110011: three even-parity bits go into positions 1, 2 and 4, and your four bits fill positions 3, 5, 6 and 7.
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🏠 Home, food & hobbiesFree
Harmonic series
The first ten terms of the harmonic series add up to 2.928968253968, just under three, even though each new fraction is smaller than the last.
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💰 Finance & moneyFree
Hire an expert vs train a fresher
An expert at 120,000 salary, 24,000 recruiting and 4,000 training costs 148,000 in year one; a fresher at 48,000, 6,000 and 18,000 costs 72,000, saving 76,000.
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📅 Dates & timeFree
Image file size calculator
Enter width, height and bit depth and get the uncompressed size of the image: 1920 by 1080 pixels at 24 bits per pixel is 6,220,800 bytes, or 6.2208 MB.
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🎓 EducationFree
Journal impact factor calculator
840 citations in a year to a journal's recent papers, divided by its 200 citable items from the two years before, give an impact factor of 4.2.
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🏗️ Engineering & constructionFree
LM317 calculator
With 240 Ω and 720 Ω, an LM317 delivers 5.036 V, a little over 5 V: enter the two programming resistors and get the output voltage the datasheet formula gives…
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🧭 Travel & geographyFree
Latitude longitude distance
Turn two latitude and longitude pins into a single figure in kilometres: 40.7128, -74.006 and 51.5074, -0.1278 lie 5570.22218 km apart along the great circle, a…
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🏠 Home, food & hobbiesFree
Minecraft stack calculator
130 cobblestone is 2 full stacks of 64 plus 2 left over, which takes 3 inventory slots. Enter any item count to get stacks, leftovers and slots for chests…
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🏠 Home, food & hobbiesFree
MM to carat conversion
A 6.5 mm round brilliant with a specific gravity of 3.52 weighs a little over one carat. Enter the diameter, the cut and the mineral's specific gravity to…
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🎓 EducationFree
NaNoWriMo daily word count
50,000 words in 30 days means 1,667 words a day, rounded up so that writing the quota every day really finishes the draft.
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🏠 Home, food & hobbiesFree
Song duration calculator
A 32-bar chorus in 4/4 at 120 BPM lasts 64 seconds, or 1:04 on the clock. Enter the tempo, the meter and the measures to know whether a piece fits a set list, a…
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🏠 Home, food & hobbiesFree
Music transposer
Raise C D E F by two semitones and you get D E F# G: paste a note, a melody line or a chord progression, set the half steps up or down, and copy the transposed…
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🏗️ Engineering & constructionFree
Op-amp gain calculator
Rin of 10 kΩ and Rf of 100 kΩ give an inverting op-amp stage a gain of −10, or 20 dB. Enter the two resistors to get the signed closed-loop gain and its size in…
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⚙️ Developer UtilitiesFree
Odd parity bit calculator
For 1010, which has two ones, the odd-parity bit is 1, giving 10101 with three ones. Paste a string of zeros and ones to get the bit that makes the total count…
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⚙️ Developer UtilitiesFree
Password entropy calculator
A 12-character password drawn at random from 95 printable characters carries about 78.84 bits, rated strong.
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🎧 Audio & VoiceFree
Playback speed calculator
A 180-second clip played at 1.5x lasts 120 seconds, saving 60. Enter any duration and a positive speed, and the result comes back in the same unit you used…
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🏗️ Engineering & constructionFree
PCB trace current calculator
A 10 mil outer trace in 1 oz copper with a 10 °C rise carries a little under 1 A. Enter width, copper weight and allowed temperature rise to get the IPC-2221…
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🏗️ Engineering & constructionFree
PCB trace width calculator
One ampere on 1 oz outer copper with a 10 °C rise needs a trace just under 12 mils wide. Enter the current, copper weight and heating you accept to get the…
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🖼️ ImagesFree
Pixel aspect ratio calculator
A 720×480 frame meant to look 4:3 has pixels shaped 8:9, not square ones. Enter the display ratio and the stored resolution to get the shape of one pixel, so…
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🏠 Home, food & hobbiesFree
Pizza tip calculator
A pizza bill of 40 with a 15% tip split between 2 people means a tip of 6, a total of 46 and 23 each.
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🎧 Audio & VoiceFree
Port length calculator
Give it a 3-inch port, a 40 Hz tuning and a 2 cubic foot box, and it tells you how long to cut each tube, already net of the 2.196 inches the open ends add.
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🖼️ ImagesFree
Portrait aspect ratio calculator
A 1080 × 1350 portrait reduces to 4:5, because both sides divide by 270. Enter the width and height of any taller-than-wide image and get its simplified ratio…
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⚙️ Developer UtilitiesFree
RAM latency calculator
Turn the CAS latency and clock on a memory kit into real time: CL16 at 1600 MHz, sold as DDR4-3200, takes 10 ns until the first word arrives.
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🏠 Home, food & hobbiesFree
RAID calculator
Four 2 TB disks in RAID 5 give 6 TB of usable space out of 8 TB raw, a 75% efficiency, and one disk can fail.
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💰 Finance & moneyFree
Rounds per minute calculator
Turn a cadence measured per second or per hour into rounds per minute: 10 rounds per second is 600 RPM and 36,000 per hour, all three shown together so range…
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🏠 Home, food & hobbiesFree
Semitone calculator
Concert A at 440 Hz lands on A4 with 0 cents, while 445 Hz is still A4, a few cents sharp: enter any frequency to get the nearest note, its octave and how far…
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🏠 Home, food & hobbiesFree
Sandbox calculator
An 8 by 4 foot sandbox filled 0.5 ft deep holds 16 cubic feet of sand, which is 32 bags of half a cubic foot each.
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🎬 VideoFree
Resolution scale calculator
Multiply a frame by any factor and get its new size: 1920 by 1080 at a scale of 2 becomes 3840 by 2160, the 4K UHD frame, with even dimensions ready for…
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🎧 Audio & VoiceFree
Speaker box calculator
A driver with Vas 30 litres, Qts 0.4 and Fs 35 Hz wants a sealed box of about 14.12 litres, rolling off near 61.87 Hz.
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🏠 Home, food & hobbiesFree
Snowman calculator
Balls with radii of 3, 2 and 1 give diameters of 6, 4 and 2: enter the three radii in one unit and get each diameter plus the total snow volume, the sum of…
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✍️ Text & AIFree
Small caps converter
Hello World becomes Hᴇʟʟᴏ Wᴏʀʟᴅ: the 8 lowercase letters turn into small capitals while H and W stay full size.
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🎓 EducationFree
Test grade calculator
Enter the points earned and the points possible: 85 out of 100 comes back as 85 % and a B on the standard ten-point US scale.
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🏠 Home, food & hobbiesFree
Tip from net price
A net price of 86.4 at an 18% tip gives a tip of 15.55 and a total of 101.95 to pay. Use it for dinners, deliveries, rides and salon bills, with tip and total…
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✍️ Text & AIFree
Subscript generator
Type H2O and copy H₂O: digits, plus and minus signs and the letters Unicode lowers, such as a, n and x, become real subscript characters that stay lowered…
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✍️ Text & AIFree
Superscript generator
Type Hello and copy ᴴᵉˡˡᵒ: every letter, digit and math sign with an official superscript form is raised, and the rest stays as typed.
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🎬 VideoFree
Time-lapse calculator
An eight-hour sunset captured every 5 seconds gives 5760 frames and a 192-second clip at 30 frames per second, 150 times faster than real life.
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💰 Finance & moneyFree
Travel job application cost calculator
Fees of 150, documents of 85.5 and travel of 420 add up to 655.5: the up-front cash a travel nurse, therapist or overseas teacher really needs.
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🖼️ ImagesFree
TV mounting height calculator
With your eyes at 42 inches on the sofa and a screen 27 inches tall, the bottom of the TV goes at 28.5 inches and the center lands at eye level.
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🎬 VideoFree
Video file size calculator
A 60-second clip at 8 megabits per second with 128 kilobits per second of audio comes to 60.96 megabytes.
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🎓 EducationFree
What grade was I in year
Born in 1998? In 2010 you were 12 and in 7th grade, middle school, on the standard US progression.
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🔬 ScienceFree
Activation energy calculator
If a rate constant rises from 0.0001 to 0.0004 when the temperature goes from 300 K to 310 K, the activation energy is 107194.52158060214 J/mol.
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🔬 ScienceFree
Alligation calculator
Reaching 50% from an 80% stock and a 30% stock takes 20 parts of the first and 30 of the second, a 2:3 ratio, or 40% and 60% of the blend.
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🔬 ScienceFree
Atomic mass calculator
Turn isotope data into a table atomic mass: chlorine, with 0.7577 of its atoms at 34.96885 amu and 0.2423 at 36.9659 amu, comes to 35.452735215 amu.
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🔬 ScienceFree
Avogadro calculator
Turn an amount in moles into a particle count with the exact Avogadro constant: 1 mol is 6.02214076 × 10²³ atoms, molecules, ions or formula units.
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1
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
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
Pay only for what you use
No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.
Free tools
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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
Pay-as-you-go
Per task
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The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
Balance
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Top up your balance and spend it across web, API and the app. It never expires.