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🏗️ Engineering & constructionFree
Blocks in contact force calculator
Pushing a 4 kg block with 20 N against a 6 kg block gives both an acceleration of 2 m/s² and a contact force of 12 N between them.
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📄 Documents & PDFFree
Generate a typographic type scale for heading levels
Start from 16 px body text and a 1.25 ratio and the headings climb in even steps: h6 is 20, h5 is 25, h4 is 31.25, and each level up multiplies by the same…
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➗ MathFree
Circle formula
Both circle equations from a center and a radius: center (3, −2) and radius 5 give (x − 3)² + (y + 2)² = 25 and x² + y² − 6x + 4y − 12 = 0.
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➗ MathFree
Circle measurements
One radius, three answers: a circle with a radius of 5 has a diameter of 10, a circumference of 31.415927 and an area of 78.539816.
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🏗️ Engineering & constructionFree
Equilibrant force calculator
Forces of (3, 4) and (−1, 2) add up to a resultant of (2, 6), so the force that balances them is (−2, −6), with the same size and the opposite direction.
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🏗️ Engineering & constructionFree
Action-reaction force calculator
Enter the push one body gives another and get the push it receives back: 50 N to the right returns 50 N to the left, written as minus 50.
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🏗️ Engineering & constructionFree
Wedge mechanical advantage calculator
A wedge with a 12 cm slope and a 3 cm thick end has an ideal mechanical advantage of 4: the output force is four times your effort, before friction.
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➗ MathFree
Seeded random number generator in a range
With a range from 10 to 100 and the seed 2026, the result is 11, and it will be 11 again whenever you repeat those inputs.
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➗ MathFree
Seeded random string generator
Type a seed such as release-2026-08, ask for 24 characters, and you get DRWAF7foOYXgYWU4VpEGTuft every time you repeat those settings, so sample codes and demo…
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🏠 Home, food & hobbiesFree
Seeded coin flip simulator
12 flips with the seed demo-2026 always give 5 heads and 7 tails, in the same order every time. Enter how many flips you want and any text as the seed to get…
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🏠 Home, food & hobbiesFree
Seeded dice roller
Three six-sided dice with the seed campaign-round-7 always roll 5, 5 and 3, for a total of 13. Choose the dice, the sides and a text seed so every player…
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🏠 Home, food & hobbiesFree
Pick a random name from a list with a reproducible seed
With the seed team-lunch-2026, the 4 names Avery, Blake, Casey and Devon always come out in the same order.
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➗ MathFree
Circle perimeter calculator
Find the length of a circle's edge from its radius alone, so a radius of 5 gives a perimeter of 31.415927, in the same unit you measured in.
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➗ MathFree
Circle theorems calculator
Enter one angle, pick a circle theorem and get the related angle, so a central angle of 80 degrees gives an inscribed angle of 40 on the same arc.
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➗ MathFree
Circumcenter of a triangle
Find the point that sits at the same distance from a triangle's three corners: for vertices (0, 0), (4, 0) and (0, 3) the circumcenter is (2, 1.5), the midpoint…
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🏗️ Engineering & constructionFree
Force for constant speed calculator
Pulling a 200 N crate at constant speed on a floor with a friction coefficient of 0.25 takes 50 N: on level ground the force is the coefficient times the…
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🏗️ Engineering & constructionFree
Period of circular motion calculator
Divide the circumference by the speed and you have the period: an object on a 2 m circle moving at π m/s completes one lap every 4 seconds, 0.25 laps per…
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🏗️ Engineering & constructionFree
Time to slide down incline calculator
On a 30° ramp with a friction coefficient of 0.2, a block starting from rest covers 10 m in 2.49814137366 s.
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⚙️ Developer UtilitiesFree
Convert text to the NATO phonetic alphabet
SOS becomes Sierra Oscar Sierra: paste a name, ticket reference or address and each English letter turns into its NATO radio word, in the same order.
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➗ MathFree
Circumference calculator
Measure across a circle and get the length around it: a diameter of 10 gives a circumference of 31.415927, in the same unit you measured in.
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🏗️ Engineering & constructionFree
RPM to angular frequency calculator
60 rpm is exactly 2π rad/s, or 1 Hz: the calculator turns revolutions per minute into angular frequency with ω = 2π × rpm / 60, and adds the frequency in hertz…
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🏗️ Engineering & constructionFree
Conical pendulum calculator
A 1 m string held at 30° from the vertical traces a circle of 0.5 m radius. Enter length, angle and gravity to get the period and speed of each orbit, plus cone…
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🏗️ Engineering & constructionFree
Tangential acceleration calculator
An angular acceleration of 2 rad/s² at a radius of 3 m gives a tangential acceleration of 6 m/s². Enter both values to get the signed result and its magnitude…
A
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⚙️ Developer UtilitiesFree
Seeded numeric PIN generator
Length 6 with the seed release-demo-2026 always gives 095015, and it is not flagged as weak. Build repeatable PINs for form tests, screenshots and demos, with…
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✍️ Text & AIFree
Generate an acrostic poem skeleton from any word
Type DREAM and get D, R, E, A and M on 5 separate lines, ready for you to finish each one with your own words.
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➗ MathFree
Circumference to diameter
Wrap a tape around something round and turn that reading into its width: a circumference of 31.41592653589793 gives a diameter of 10.
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🏗️ Engineering & constructionFree
Conservation of energy calculator
An object released from rest at 10 m reaches 14 m/s by the time it drops to 0 m, with gravity at 9.8 m/s².
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🏗️ Engineering & constructionFree
Change in potential energy calculator
Lifting 2 kg by 5 m with gravity at 9.8 m/s² stores 98 J of potential energy: enter the mass, gravity and height change to get the gain, or a negative value…
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➗ MathFree
Circumference and area of a circle
One radius gives you both numbers a round object needs: a radius of 5 has a circumference of 31.415927 and an area of 78.539816.
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➗ MathFree
Circumference to Radius Calculator
Measure the edge and get the radius a drawing or a machine asks for: a circumference of 31.415927 gives a radius of 5, in the same unit.
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➗ MathFree
Circumscribed circle
Find the one circle that runs through three points: for (0, 0), (4, 0) and (0, 3) the circumscribed circle is centered at (2, 1.5) with a radius of 2.5, the…
A
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➗ MathFree
Classifying triangles by sides and angles
Enter three side lengths and get both labels at once: 3, 4 and 5 make a scalene right triangle. It sorts by sides and by angles, and first checks that the…
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➗ MathFree
Clock angle calculator
At 3:30 the hands of a clock are 75 degrees apart, not 90, because the hour hand keeps creeping toward four.
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🏗️ Engineering & constructionFree
Impact force calculator
Stopping 450 J of kinetic energy within 0.05 m takes an average force of 9,000 N. Enter the energy to absorb and the crush, padding or braking distance to see…
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🏗️ Engineering & constructionFree
Power to lift load calculator
Raising 50 kg by 10 m in 5 seconds takes 4903.325 J of work and 980.665 W of average power under standard gravity. Use it to size a hoist, winch or lift motor.
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🏗️ Engineering & constructionFree
Work to raise a mass calculator
Lifting 2 kg through 5 m with g at 9.8 m/s² takes 98 J of work against gravity. Enter mass, local g and the lift height and get the energy a slow, steady lift…
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📈 SEOFree
Recommended hashtag count by platform
Type a network such as Instagram and get its recommended hashtag range, 3 to 5, ready for a publishing rule or checklist.
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📈 SEOFree
Social media character limit checker
Know whether a post fits before it is scheduled: Launch day! 🚀 on X counts 13 characters against a 280 limit, leaving 267.
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🎬 VideoFree
Check whether a video aspect ratio matches a platform requirement
See whether a video's shape fits where it will appear: 16:9 matches a standard YouTube video, while the same ratio in a vertical Shorts slot would need its…
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Runs in your browser
📅 Dates & timeFree
Brand palette usage ratio checker
A layout at 57% blue, 32% gray and 11% orange still passes a 60-30-10 brand guideline with a 3-point tolerance.
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➗ MathFree
Cofactor expansion calculator
Expand a determinant along the row or column you pick and see every term: in the 3×3 example, the first row contributes 4, 5 and −60, which add up to −51.
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➗ MathFree
Cofactor matrix calculator
Get every signed cofactor of a square matrix at once: for rows (1, 2) and (3, 4), the cofactor matrix has rows (4, −3) and (−2, 1), with each checkerboard sign…
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➗ MathFree
Cofunction calculator
Evaluate any trig function through its partner at the complementary angle, so sin(30) becomes cos(60), which is 0.5, and you see the cofunction and the…
A
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🏗️ Engineering & constructionFree
Climbing power calculator
A 70 kg hiker who gains 100 m in 600 s does 68,646.55 J of work against gravity. Enter body mass, vertical gain and time, and the tool turns that work into…
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Runs in your browser
🏗️ Engineering & constructionFree
Input power required calculator
A motor that must deliver 750 W at 85% efficiency needs an input of 882.352941176 W. Enter the useful output power and the efficiency as a fraction to get the…
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🏗️ Engineering & constructionFree
Kinetic energy lost in collision calculator
When a 2 kg body at 4 m/s sticks to a 3 kg body at −2 m/s, 21.6 J of the 22 J of kinetic energy turns into heat, deformation or sound.
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📈 SEOFree
Validate UTM campaign naming conventions
Check a campaign name such as summer-sale-q3 against the naming convention your team chose and see which rules pass or fail, so a stray capital or space never…
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💰 Finance & moneyFree
Sprint burndown calculator
With 80 points committed, 32 done and 6 days left, the team needs 8 story points per remaining day to finish the 48 still open.
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💰 Finance & moneyFree
Calculate OKR key result progress percentage
A key result that started at 20, now sits at 65 and aims for 100 is 56.25% complete, because progress is measured from the starting value.
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💰 Finance & moneyFree
Team sprint capacity calculator
Three people with 60, 48 and 72 available hours and a 70% focus factor give 126 focused hours, or 21 story points at 6 hours each.
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📅 Dates & timeFree
Calculate agile team average velocity and planning velocity
Enter the completed story points of recent sprints to get your team's average velocity and a cautious planning figure: five sprints totalling 150 points average…
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➗ MathFree
Coin rotation paradox
Find how many turns a circle makes rolling around another: two identical coins give 2 rotations, not 1, because the count is (R + r) / r.
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➗ MathFree
Column space calculator
Get a column space basis straight from the pivot columns. For rows (1, 2, 3), (2, 4, 6) and (1, 0, 1), the original columns (1, 2, 1) and (2, 4, 0) form the…
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🏗️ Engineering & constructionFree
Center of mass velocity calculator
Two particles, 2 kg at 3 m/s and 1 kg at rest, have a center of mass moving at 2 m/s and a total momentum of 6 kg·m/s.
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🏗️ Engineering & constructionFree
Coefficient of restitution calculator
A ball that approaches at 10 m/s and separates at 6 m/s has a coefficient of restitution of 0.6. Enter both relative speeds in the same unit to see how bouncy…
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🏗️ Engineering & constructionFree
Rocket thrust calculator
An engine expelling 250 kg of propellant per second at 3000 m/s produces 750,000 N of thrust. Enter the mass flow rate and the effective exhaust velocity to get…
A
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💰 Finance & moneyFree
Customer Account Health Score Calculator
Usage 82, support 68, NPS 74 and payments 95, weighted 35, 20, 25 and 20%, give an account health score of 79.8: just under the healthy line of 80, so it needs…
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💰 Finance & moneyFree
KPI gap to target calculator
A KPI at 72 against a target of 90 is 18 away, a gap of 20% of the target. Use it for revenue, conversion, quality or any other numeric indicator measured in…
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💰 Finance & moneyFree
Estimate contract renewal risk category from customer health
A customer with a health score of 82 and 120 days until renewal is low risk. A score below 50 or 30 days or fewer left makes it high risk, whichever signal is…
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➗ MathFree
Least common denominator calculator
Get the smallest denominator two fractions can share: for 12 and 18 it is 36, so 5/12 and 7/18 become 15/36 and 14/36 and add in one step.
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2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
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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The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
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