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🏠 Home, food & hobbiesFree
Wall stud calculator
A 120-inch wall framed at 16 inches on center takes 9 studs, counting both corners, and one door adds 2 more for 11 in total.
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Wall tile calculator
A 12 m² wall covered in 0.3 by 0.6 m tiles with 10% waste needs 74 tiles, which is 8 boxes of 10 with 6 left over.
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Wallpaper rolls calculator
A 5 m wide, 2.4 m high wall with 10 m by 0.53 m rolls and a 0.64 m pattern repeat needs 4 rolls: 10 strips cut to 2.56 m, 3 per roll. Area alone would say 3.
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Water tank volume calculator
A 2 by 1 by 1.5 meter tank filled to 0.75 meters holds 1500 of its 3000 liters. Pick a box, upright cylinder or horizontal cylinder, enter inside dimensions and…
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Buy one get one discount calculator
Take five items on a buy-one-get-one deal and you pay for three, two come at no charge and the real discount is 40 %.
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Recipe cost per serving calculator
Flour, eggs, milk and butter costing 6.7 in all, cut into 4 servings, come to 1.675 per plate. Enter what each ingredient cost for the batch and how many it…
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Shared expense splitter
Receipts of 45.5, 30 and 24.5 shared by three people, one of them counted double, come to 25, 25 and 50.
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Quit a habit savings calculator
Skip a habit that costs 5.5 a day for 30 days and you keep 165. Enter what it costs on a typical day and how long you plan to stay off it, from a trial month to…
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Markup to margin converter
An 80 cost with a 25% markup sells for 100, which is only a 20% margin. Enter the cost and either the markup or the margin to get the selling price, the profit…
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Overtime pay calculator
A rate of 20 with 40 regular hours and 5 overtime hours at 1.5 times gives 800 regular, 150 overtime and 950 gross.
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Price per 100g calculator
A 500 g pack at 1.5 and a 2000 g bag at 3 cost 0.3 and 0.15 per 100 g, so the big bag wins even with the higher sticker.
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Rule of 114 and 144 calculator
At 8% a year, savings take about 14.25 years to triple and 18 years to quadruple: 114 and 144 divided by the rate.
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Salary to hourly converter
A salary of 52,000 at 40 hours a week for 52 weeks works out to exactly 25 an hour and 1,000 a week.
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Sales tax calculator
A purchase of 100 at 8.25% sales tax carries 8.25 in tax and a total of 108.25 at checkout. Type the pre-tax price and the rate as a percentage, and every step…
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Savings goal time calculator
With 10,000 as the goal, 2,500 already saved and 500 set aside each month, you reach the target in exactly 15 months, or one year and three months.
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Subscription annual cost calculator
A 15.99 monthly streaming plan, 99.99 a year for cloud storage and 12 a month for news come to 36.32 a month and 435.87 a year.
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Tip and split calculator
A bill of 86.4 with an 18% tip split four ways comes to a 15.55 tip, a 101.95 total and 25.49 per person.
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Unit price comparison calculator
A 32-ounce jar at 5.99 beats a 16-ounce jar at 3.49 once both prices are divided by size: it costs less per ounce.
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➗ MathFree
Arithmetic sequence calculator
Start at 2 and add 3 each time: the fifth term is 14, and the first five terms add up to 40. Enter the first term, the common difference and a position to get…
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➗ MathFree
Arithmetic series sum calculator
The numbers from 1 to 10 add up to 55, and the even numbers from 2 to 20 add up to 110. Enter the first term, the last term and how many terms there are, and…
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➗ MathFree
Catalan number calculator
Get the exact n-th Catalan number: C(5) is 42 and C(10) is 16796, written out digit for digit with no rounding, even for very large n.
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➗ MathFree
Double factorial calculator
7!! is 7 × 5 × 3 × 1, which makes 105, and 6!! is 6 × 4 × 2, which makes 48: the double factorial multiplies only the numbers that share the parity of n.
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➗ MathFree
Factorial calculator
5! is 120 and 10! is 3628800. Enter a whole number from 0 to 5000 and get its exact factorial with every digit, never a rounded or approximate value, ready for…
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➗ MathFree
Fibonacci number calculator
The 10th Fibonacci number is 55, counting F1 and F2 as 1. Enter a position up to 10000 and get the exact term, even when it runs to hundreds of digits, or ask…
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➗ MathFree
Sum of Fibonacci series
The first 10 Fibonacci numbers add up to 143, which is F(12) minus 1. Enter how many terms to add, up to 1000, and get the exact sum and the list of terms…
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➗ MathFree
Infinite geometric series sum
Enter the first term and the common ratio to get the total of an infinite geometric series: a first term of 1 with a ratio of 0.5 adds up to 2.
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➗ MathFree
Hexagonal number calculator
The 5th hexagonal number is 45. Enter a position to get its exact hexagonal number, every digit kept even for huge results, or enter any whole number to learn…
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➗ MathFree
Look-and-say sequence
Read a string of digits aloud in runs and write down what you hear: starting from 1, the fifth term is 111221.
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➗ MathFree
Padovan sequence calculator
P(10) is 12: each Padovan number adds the terms two and three places back, starting from three ones, so the list runs 1, 1, 1, 2, 2, 3, 4, 5, 7, 9, 12.
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➗ MathFree
Pentagonal number calculator
The 5th pentagonal number is 35, from n(3n − 1)/2. Enter an index to get its pentagonal number, or enter any whole number to find out whether it belongs to the…
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➗ MathFree
Polygonal number calculator
Choose the number of sides and the position in the sequence to get any polygonal number exactly: the fifth pentagonal number is 35 and the tenth square is 100.
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➗ MathFree
Primorial calculator
Multiply every prime up to n and get the exact result: 10# is 2 × 3 × 5 × 7, which is 210, along with the list of primes and how many there are.
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➗ MathFree
Square pyramidal number
Get the n-th square pyramidal number, the count of balls stacked in a square-based pyramid: for n of 5 it is 55, the sum of the first five squares.
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➗ MathFree
Stern diatomic / Stern-Brocot sequence
Get any term of Stern's diatomic sequence from its index: s(10) is 3, worked out in whole-number steps that halve the index each time, so even large indices…
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➗ MathFree
Sum of first n even numbers
Add 2 + 4 + … + 2n in one step with the formula n(n + 1): with n of 5 the total is 30, and the result stays an exact whole number for any n up to ten million.
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➗ MathFree
Sum of first n odd numbers
Add the first n odd numbers in one step, because they always total n squared: the first 10 odd numbers add up to 100 and the first 100 add up to 10000.
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➗ MathFree
Sum of first n squares
Add the first n squares in one step with n(n + 1)(2n + 1)/6: 1² + 2² + 3² + 4² + 5² is 55, and every n from 0 to ten million gives an exact whole number.
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➗ MathFree
Sylvester sequence calculator
Each term of Sylvester's sequence is 1 plus the product of all the terms before it: 2, 3, 7, 43, 1807, and the term at position 5 is 3263443.
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🏗️ Engineering & constructionFree
Angular velocity calculator
Sweeping 2π radians in 2 seconds is an angular velocity of π rad/s, or 30 rpm: enter an angle and a time, or just the RPM, and the calculator returns ω in…
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🏗️ Engineering & constructionFree
Atwood machine calculator
With 5 kg and 3 kg hanging over an ideal pulley, the system accelerates at 2.4525 m/s² and the rope carries 36.7875 N, with the 5 kg side going down: the…
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🏗️ Engineering & constructionFree
Average velocity calculator
Moving 100 metres in 20 seconds is an average velocity of 5 m/s, or 18 km/h: enter the total displacement and the time, and the calculator gives both units plus…
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🏗️ Engineering & constructionFree
Banked curve calculator
A curve with a 50 m radius taken at 20 m/s needs a bank of 39.1970508975 degrees if no friction is to help: the calculator solves tan θ = v²/(r·g) and gives the…
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🏗️ Engineering & constructionFree
Centripetal acceleration calculator
An object moving at 10 m/s on a 5 m radius needs 20 m/s² of inward acceleration to stay on its circle.
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🏗️ Engineering & constructionFree
Centripetal force calculator
A 2 kg mass moving at 10 m/s on a 5 m radius needs a 40 N pull toward the centre. Use it to check string tension, the grip a car needs on a curve, or a homework…
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🏗️ Engineering & constructionFree
Coefficient of friction calculator
A friction force of 20 N against a normal force of 50 N gives a coefficient of friction of 0.4. Enter both forces in the same unit and get the dimensionless…
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🏗️ Engineering & constructionFree
Elastic collision calculator
A 2 kg body at 3 m/s hitting a resting 1 kg body leaves at 1 m/s while the second shoots off at 4 m/s.
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🏗️ Engineering & constructionFree
Force calculator
A 5 kg mass accelerating at 4 m/s² needs a net force of 20 N: give any two of force, mass and acceleration and the calculator solves the third with Newton's…
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🏗️ Engineering & constructionFree
Free fall calculator
Drop something from 19.62 m with gravity at 9.81 m/s² and it lands after 2 seconds at 19.62 m/s: enter any height to get both the fall time and the impact…
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🏗️ Engineering & constructionFree
Hooke's law calculator
A spring with a constant of 10 N/m stretched by 2 m pulls with 20 N. Enter any two of force, spring constant and displacement and get the third from Hooke's law…
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🏗️ Engineering & constructionFree
Horizontal projectile motion calculator
A ball that leaves a 20 m ledge horizontally at 15 m/s hits the ground about 2 seconds later. Enter the launch height and the sideways speed to get the fall…
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🏗️ Engineering & constructionFree
Impulse calculator
A 50 N push lasting 0.02 s delivers an impulse of 1 N·s, and the object's momentum changes by exactly that amount.
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🏗️ Engineering & constructionFree
Inclined plane calculator
A 10 kg block on a 30-degree slope with a friction coefficient of 0.2 accelerates downhill at just over 3 m/s² and presses on the surface with about 85 N.
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🏗️ Engineering & constructionFree
Kinematics distance calculator
An object that starts at 10 m/s and accelerates at 2 m/s² for 5 s covers 75 m. Enter the initial velocity, the constant acceleration and the elapsed time to get…
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🏗️ Engineering & constructionFree
Final velocity calculator
Starting at 10 m/s and accelerating at 2 m/s² for 5 s, an object ends up at 20 m/s. Enter the initial velocity, the acceleration and the elapsed time, with…
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🏗️ Engineering & constructionFree
Kinetic energy calculator
A 2 kg mass moving at 3 m/s carries 9 J of kinetic energy. Enter any two of mass, speed and energy and get the third from KE = ½mv², or all three to check a…
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🏗️ Engineering & constructionFree
Moment of inertia calculator
A solid disc of 2 kg and 3 m radius has a moment of inertia of 9 kg·m² about its central axis. Pick ring, disc, sphere or rod, enter the mass and the radius or…
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🏗️ Engineering & constructionFree
Momentum calculator
Multiply mass by velocity and get linear momentum with its sign: 2 kg moving at 5 m/s carries 10 kg·m/s, and a reversed velocity gives a negative result, so…
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🏗️ Engineering & constructionFree
Newton's second law calculator
Give any two of mass, acceleration and net force and the third appears with its working: a 10 kg body accelerating at 2 m/s² needs a net force of 20 N.
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🏗️ Engineering & constructionFree
Pendulum length calculator
Tell it the swing time you want and get the string length: a 2-second period under 9.81 m/s² needs just under 1 m.
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🏗️ Engineering & constructionFree
Power calculator
Divide the work done by the time it took: 1000 J delivered in 2 seconds is 500 W of average power, and the result also comes in mechanical horsepower for engine…
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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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