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➗ MathFree
Cosine Half-Angle Calculator
If cos(θ) is 0.5 and the half-angle lies in quadrant II, cos(θ/2) is about −0.8660254037844386: the square root gives the size and the quadrant settles the…
B
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➗ MathFree
Solve A sin(Bx) + C equation calculator
Get every root in your range, not just one: 2 sin(x) equals 1 between 0° and 360° has two roots, 30° and its supplementary angle.
B
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➗ MathFree
Sum-to-product sine calculator
Turn a sum of two sines into a product: sin 50° + sin 10° becomes 2 sin 30° cos 20°, with the half-sum and half-difference shown and both forms evaluated to…
K
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➗ MathFree
Triangle area from two sides and included angle calculator
Sides of 3 and 4 with a 90° angle between them enclose an area of 6. Enter two side lengths in one unit and the included angle in degrees to get the triangle's…
K
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➗ MathFree
Radians to gradians conversion calculator
Move an angle from radians to the 400-part circle in one step: π radians become exactly 200 gradians, a straight angle.
K
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➗ MathFree
Midpoint of polar coordinates calculator
Find the true halfway point between two radius-and-angle positions: points at the same distance at 350° and 10° meet in the middle at 0°, not at 180° as a plain…
B
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➗ MathFree
Exponential growth model solution calculator
Start with 100 and a continuous rate constant of 0.05 per unit of time, and after 10 units the solution of dA/dt = kA gives 164.87212707, with the exponent 0.5…
B
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➗ MathFree
Runge-Kutta 2 ODE Solver Calculator
Starting at y(0) = 1, four midpoint steps of 0.1 carry y' = x + y to 0.4 and give 1.58180410125. Choose the midpoint, Heun or Ralston rule, and every slope and…
B
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➗ MathFree
Involute function
Enter a pressure angle in radians and get its involute, tan(a) minus a: 20 degrees, which is 0.3490658503988659 radians, gives 0.014904383867.
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➗ MathFree
Irregular polygon area calculator
List the corners of a straight-sided shape in boundary order and get its area: the L-shaped outline (0, 0), (6, 0), (6, 2), (3, 5), (0, 2) encloses 21 square…
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➗ MathFree
Irregular trapezoid area calculator
Measure the two parallel sides and the gap between them to get the area of any trapezoid, crooked legs included: bases of 10 and 6 metres, 4 metres apart, give…
H
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➗ MathFree
Is modulo associative?
Find out whether the grouping changes a chained remainder: for 17, 5 and 3, (17 % 5) % 3 gives 2 but 17 % (5 % 3) gives 1, so the answer is no.
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➗ MathFree
Isosceles right triangle calculator
Give one side of a right triangle with two equal legs and get the side you are missing: a leg of 5 gives a hypotenuse of 7.0710678119, because the sides always…
H
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➗ MathFree
Isosceles triangle angles
Enter the vertex angle of an isosceles triangle and get its two equal base angles: a 40° vertex leaves 140° to share, so each base angle is 70°.
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➗ MathFree
Isosceles triangle area calculator
Give the base and the length of the two equal sides and get the area of an isosceles triangle: a base of 10 with sides of 13 has a height of 12 and an area of…
H
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➗ MathFree
Isosceles triangle area calculator
Enter the base and the equal sides of an isosceles triangle to get its height and area together: a base of 6 with sides of 5 gives a height of 4 and an area of…
G
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🖼️ ImagesFree
HSL to CMYK converter
Go from an HSL swatch to process inks in one step: hue 210, saturation 80% and lightness 45% become cyan 89%, magenta 44%, yellow 0% and key 19%, by way of RGB…
P
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🖼️ ImagesFree
HSL to HWB converter
Describe a color as a hue plus white and black: hsl(210, 80%, 45%) becomes whiteness 9% and blackness 19% on the same hue, written as hwb(210 9% 19%).
S
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➗ MathFree
Isosceles triangle height calculator
Enter the base and one of the equal sides of an isosceles triangle and get its height: a base of 10 with sides of 13 rises 12 units to the apex.
H
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➗ MathFree
Isosceles triangle side calculator
Enter the base and the height of an isosceles triangle and get the length of its two equal sides: a base of 6 and a height of 4 give sides of 5, the 3-4-5 right…
G
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➗ MathFree
Lagrange error bound calculator
Give a bound M on the derivative, the interpolation nodes and the point you care about, and get the largest error the polynomial can have there: nodes 0, 1 and…
G
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🖼️ ImagesFree
RGB to RGB555 packer
Pack an RGB color into a 15-bit RGB555 word: orange 255, 128, 0 becomes 32256, or 0x7E00. Each channel keeps its top five bits, the layout used by VGA…
P
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🖼️ ImagesFree
RGB to RGB565 packer
Turn an RGB color into the 16-bit word a TFT display expects: orange 255, 128, 0 packs to 64512, or 0xFC00.
S
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➗ MathFree
Lateral area of a cone
Give the base radius and the slant height of a cone and get the area of its curved side only, without the base: a radius of 3 and a slant height of 5 give…
H
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➗ MathFree
Lateral area of a trapezoidal prism calculator
Add the four sides of a trapezoidal cross-section and multiply by the length to get the area of the prism's four side faces: sides of 10, 6, 5 and 5 with a…
G
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🖼️ ImagesFree
Extract color channel
Get one number out of a color instead of a full conversion: the red of #3498db is 52, and the transparency of #3498db80 is 128, both on the same 0 to 255 scale.
P
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🖼️ ImagesFree
Adjust color contrast by factor
Push a color's channels away from mid-grey 128 to make it punchier, or toward it to flatten it: #3366cc with a factor of 1.5 becomes #0d59f2.
S
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🖼️ ImagesFree
Vivid light blend
Combine a base and a top color the way vivid light does: gray #808080 under a lighter #C0C0C0 brightens all the way to #FFFFFF.
S
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➗ MathFree
Lateral surface area of a cylinder
Enter the radius and height of a cylinder and get the area of its curved side alone, without the two ends: a radius of 4 and a height of 10 give 251.3274122872.
H
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➗ MathFree
Latus rectum calculator
Enter the coefficients of a parabola, or of an ellipse centred at the origin, and get the length of its latus rectum: for the parabola 0.25·x² it is 4, the…
G
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➗ MathFree
Law of cosines calculator
Give two sides and the angle between them to get the third side, or all three sides to get an angle: sides of 5 and 7 meeting at 60° leave a third side of…
H
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🖼️ ImagesFree
Monochromatic palette generator
Five steps from #3366cc give #000000, #193366, #3366cc, #99b2e6 and #ffffff, every swatch keeping hue 220 and saturation 60 %.
P
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🖼️ ImagesFree
Accessible text color suggester
Fix text that fails contrast without losing its hue: gray #888888 on white reaches only 3.54 to 1, so it is darkened to #767676 for 4.54 to 1, just past the 4.5…
S
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🖼️ ImagesFree
Hex to CSS variable
Turn a raw color into a reusable CSS variable: #3366ff with the name brand-primary becomes --brand-primary: #3366ff;, with shorthand expanded and the hex…
S
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🖼️ ImagesFree
Is text legible on a background?
Text in #111827 on a white background at 16 px has a contrast ratio of 17.74 and passes AA and AAA, and this check gives that verdict for any pair.
P
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🖼️ ImagesFree
Parse HSL string to RGB
Read a pasted CSS color as numbers: hsl(210, 80%, 45%) becomes red 23, green 115 and blue 207, or #1773cf, whether you use commas, spaces or units such as deg…
P
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🖼️ ImagesFree
Paper-white tint adjust
Navy #3366cc printed at full coverage on cream paper #f5e6c8 previews as #315ca0, a touch darker and warmer than on screen.
S
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🖼️ ImagesFree
Average color of a list
Paste a list of hex swatches and get the one color that stands for the whole set: #FF0000, #00FF00 and #0000FF average to #555555.
P
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🖼️ ImagesFree
Nearest Crayola color
#EE204D is the crayon Red exactly, with a distance of 0 in the classic box of 64 colors. Match a color sampled from a photo or worksheet to a crayon students…
S
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🏠 Home, food & hobbiesFree
Baking powder cups to grams converter
One level US cup of baking powder weighs 230 grams. Enter any number of cups, fractions included, and get the weight in grams so biscuits, cakes and quick…
P
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🏠 Home, food & hobbiesFree
Baking soda teaspoons to grams converter
One level US teaspoon of baking soda weighs 4.6 grams, and half a teaspoon 2.3. Enter teaspoons, fractions included, and weigh the soda for cookies, cakes or…
P
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🏠 Home, food & hobbiesFree
Butter sticks to cups converter
Two US sticks of butter fill one cup, and half a stick is a quarter cup. Type the number of sticks your recipe uses and get the cups, based on the half-cup mark…
S
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🏠 Home, food & hobbiesFree
Shredded cheese cups to grams converter
One US cup of shredded cheese weighs 113 grams, the same as 4 ounces. Enter whole cups, halves or any decimal and get the gram weight for your casserole, pizza…
S
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🏠 Home, food & hobbiesFree
Recipe scale by factor calculator
250 grams of flour times 2 is 500 grams, which means adding 250 grams more. Enter one ingredient amount and your multiplier to get the scaled amount, the extra…
P
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🏠 Home, food & hobbiesFree
Batch recipe multiplier calculator
Paste 2 cups flour, 1 cup sugar, 3 eggs, choose a multiplier of 2, and get 4 cups flour, 2 cup sugar, 6 eggs.
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🏠 Home, food & hobbiesFree
Pancake batter ratio calculator
Say how many pancakes you want and get the batter: 8 medium pancakes need 120 g of flour, 240 mL of milk and 1 egg, from a classic per-pancake ratio.
S
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🏠 Home, food & hobbiesFree
Simple syrup ratio calculator
A 200-gram batch of 1:1 simple syrup is 100 grams of sugar and 100 grams of water. Enter any sugar-to-water parts and the batch weight you want, and get both…
P
Runs in your browser
➗ MathFree
Length and width of a rectangle from perimeter and side ratio
Enter a rectangle's perimeter and the ratio of its sides and get both dimensions: a perimeter of 36 with a 2 to 1 ratio gives a length of 12 and a width of 6.
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🏠 Home, food & hobbiesFree
Pork roast time by weight
A 4-pound pork roast needs 100 minutes, which is 1 hour 40 minutes, at 25 minutes per pound in a 350 °F oven.
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🏠 Home, food & hobbiesFree
Sous-vide water bath volume calculator
A tub filled 30 by 20 by 15 cm holds 9 liters; with 800 ml of bagged steaks inside, you pour 8.2 liters of water.
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🏠 Home, food & hobbiesFree
Coffee beans from water volume calculator
500 ml of brew water at 1:16 needs 31.25 g of coffee beans. Enter your kettle volume and the ratio you brew with and get the dry dose in grams and ounces, plus…
S
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🏠 Home, food & hobbiesFree
Oatmeal oats-to-liquid ratio calculator
Each oat cut drinks a different amount of liquid: 1 cup of rolled oats takes 2 cups of water or milk, steel-cut oats take four times their volume, and you also…
P
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🏠 Home, food & hobbiesFree
Beer SRM color estimator
50 malt color units in a 5-gallon batch give an MCU of 10 and just over 7 SRM, an amber beer. Enter your grain bill's color units and the batch volume to place…
S
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🏠 Home, food & hobbiesFree
Dessert quantity per person calculator
Ten guests need 15 dessert servings: the calculator plans 1.5 per person, enough for seconds without a second cake per guest, and rounds up to whole portions…
P
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🏠 Home, food & hobbiesFree
Tea steeping temperature lookup
Green tea wants water at 80 °C (175 °F), gyokuro only 60 °C and black tea a full boil at 100 °C. Type the tea named on your tin and get the kettle temperature…
P
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🏠 Home, food & hobbiesFree
Egg weight by size lookup
A large egg gives 50 g once the shell is off. Pick a USDA carton size, from peewee to jumbo, and get the average shelled weight in grams and ounces, together…
S
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⚙️ Developer UtilitiesFree
Count leading zeros calculator
Count the zero bits above the highest one-bit of a number in a fixed-width word: 16 in 8 bits is 00010000, so the count is 3.
P
Runs in your browser
⚙️ Developer UtilitiesFree
Byte-order swap calculator
0x12345678 becomes 0x78563412 when its four bytes are reversed, the step between network order and little-endian memory.
S
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⚙️ Developer UtilitiesFree
Decimal to fixed-point converter
Turn a decimal into the integer stored in a Q.n fixed-point format: 0.1 with 8 fractional bits stores 26, which really stands for 0.1015625, an error of…
P
Runs in your browser
➗ MathFree
Big integer addition calculator
9223372036854775807 plus 1 is exactly 9223372036854775808, a sum that overflows a signed 64-bit integer but is kept here digit by digit.
S
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