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❤️ Health & fitnessFree
Equivalent race times calculator
A 10K in 40:00 is worth about 19:11 over 5K, 3:04:00 for the marathon and 3:40:17 for 50K. Enter one race result to see equivalent times and paces for eight…
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❤️ Health & fitnessFree
Saturated fat limit calculator
On a 2,000-calorie day, saturated fat should stay below about 22.22 g: 10 % of the calories, divided by the 9 kcal in each gram of fat.
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❤️ Health & fitnessFree
Serum osmolality calculator
Sodium 140, glucose 90 and BUN 14 give a calculated serum osmolality of 290 mOsm/kg: 280 from sodium, 5 from glucose and 5 from BUN.
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❤️ Health & fitnessFree
Sinclair Meltzer-Faber masters calculator
A 40-year-old man weighing 81 kg with a 305 kg total gets a Sinclair coefficient of about 1.269 and an age factor of 1.135, which together turn his total into…
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❤️ Health & fitnessFree
Swim stroke rate calculator
Divide your stroke count by the seconds it took and multiply by 60 to get strokes per minute: 40 strokes in 60 seconds, or 30 in 45, is 40 SPM, one stroke every…
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❤️ Health & fitnessFree
Time to sober calculator
At a BAC of 0.08% and an elimination rate of 0.015 points per hour, reaching zero takes about 5 hours and 20 minutes.
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❤️ Health & fitnessFree
Cycling variability index calculator
A ride with a Normalized Power of 250 W and an average power of 220 W has a Variability Index of 1.1364, a moderately variable effort.
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❤️ Health & fitnessFree
Warm-Up Set Weight Calculator
With a working weight of 100 kg, the default warm-up climbs through 40, 55, 70, 80 and 90 kg before your first heavy set.
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❤️ Health & fitnessFree
Water intake per calorie calculator
At one millilitre per calorie, a 2,000 kcal day points to 2,000 ml of water, which is 2 litres or about 67.6 US fluid ounces.
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🖼️ ImagesFree
Scanned document file size calculator
Ten color pages scanned at 300 DPI on 8.5 × 11 inch paper come to 252,450,000 bytes before compression.
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🏠 Home, food & hobbiesFree
Buy one get one effective price calculator
Seven items on a buy-two-get-one deal: you pay for five, take seven home, and each one effectively costs five-sevenths of its regular price.
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🏠 Home, food & hobbiesFree
Cash change due calculator
A sale of 13.47 paid with 20.00 leaves 6.53 in change, worked out to the exact hundredth with no rounding surprises.
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🏠 Home, food & hobbiesFree
Coin jar value calculator
100 pennies, 40 nickels, 50 dimes and 40 quarters add up to 18 dollars and fill five standard bank rolls with nothing left over.
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🏠 Home, food & hobbiesFree
Coupon savings calculator
A 15% coupon on 79.99 saves 12.00 and leaves 67.99 to pay. Enter the price before the coupon, choose percent off or a fixed amount off, and see the saving and…
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🏠 Home, food & hobbiesFree
Group dinner cost share calculator
A pizza for two, a steak for one and a salad for three, with 18% tip and 8.5% tax, come to 110.06, and the steak eater pays 59.45 of it.
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🏠 Home, food & hobbiesFree
Divide money evenly with cents calculator
Split three ways, 10.00 becomes 3.34, 3.33 and 3.33, which add back to exactly 10.00. Enter an amount and the number of people to get cent-exact shares, with…
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🏠 Home, food & hobbiesFree
Gift card and cash split calculator
A purchase of 86.4 with a gift card holding 50 leaves 36.4 to pay in cash and nothing on the card.
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🏠 Home, food & hobbiesFree
Itemized bill split calculator
On a 35 food bill with 2.8 tax and a 6.3 tip, Alice, who ordered 20.5 of the food, owes 25.83 and Bob owes 18.27.
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🏠 Home, food & hobbiesFree
Membership break-even calculator
A 120 membership that cuts each use from 10 to 4 saves 6 per use and pays for itself after 20 uses, when both options cost 200.
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🏠 Home, food & hobbiesFree
Price ladder tier calculator
Start at 25, add 10% per level and five tiers come out as 25, 27.5, 30.25, 33.28 and 36.6, each step compounding on the one before.
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🏠 Home, food & hobbiesFree
Shopping budget tracker
With a budget of 100 and milk, bread, eggs and apples totalling 10.53, you have 89.47 left. The balance after every item shows which addition would tip the cart…
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➗ MathFree
Divisibility test
Is 252 divisible by 7? Yes: it fits 36 times with a remainder of 0. Enter any two whole numbers, negatives included, and get a clear yes or no together with the…
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➗ MathFree
Divisor calculator
28 has exactly six divisors, and you get every one of them in ascending order, from 1 to 28 itself, together with the count.
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➗ MathFree
Regular dodecagon
A regular dodecagon with a side of 4 has an area of 179.138439 square units. From the side alone you get the area, 3·(2+√3)·s², the perimeter, 12·s, or the…
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➗ MathFree
Double-angle formula
Enter an angle in degrees or radians, pick sine, cosine or tangent, and get the value for the doubled angle with its formula: 30° with the cosine identity gives…
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➗ MathFree
Double-angle identities
One angle in radians, all three double-angle values at once: for π/6 (0.5235987756) you get sin(2x) ≈ 0.8660254038, cos(2x) of 0.5 and tan(2x) ≈ 1.7320508076…
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➗ MathFree
e^x calculator
e squared is 7.38905609893065: type one exponent and get e raised to it, where e ≈ 2.718281828459045.
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➗ MathFree
Egyptian fraction calculator
5/6 becomes 1/2 + 1/3: enter a fraction and get it as a sum of different unit fractions, the way Egyptian scribes wrote it.
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➗ MathFree
Eigenvalue and eigenvector calculator
The matrix with rows (2, 1) and (1, 2) has eigenvalues 3 and 1, each paired with its unit eigenvector.
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➗ MathFree
Elimination method
2x + 3y = 7 and 4x − 5y = 1 meet at x ≈ 1.7272727273 and y ≈ 1.1818181818. Enter the six coefficients of two linear equations and get the solution with every…
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➗ MathFree
Ellipse circumference calculator
An ellipse with semi-axes 5 and 3 has a circumference of 25.526986, from Ramanujan's 1914 formula.
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➗ MathFree
Ellipse perimeter
Semi-axes of 5 and 3 give an ellipse perimeter of 25.526986, found with Ramanujan's formula because no exact elementary formula exists.
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➗ MathFree
Ellipse standard form
4x² + 9y² − 8x − 18y − 23 = 0 is an ellipse centered at (1, 1) with semi-axes 3 and 2 and no rotation.
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➗ MathFree
Endpoint calculator
If one end of a segment is at (0, 0) and its midpoint is at (2, 3), the other end is at (4, 6). Enter the known end and the midpoint to get the missing point…
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➗ MathFree
Engineering notation
47,000 becomes 47×10^3 and 0.000025 becomes 25×10^-6: the exponent always moves in steps of three, so it tells you the prefix, kilo or micro, at a glance.
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➗ MathFree
Equation of a circle from diameter endpoints
The ends (1, 2) and (5, 6) give a circle centred at (3, 4) with radius squared 8, so its equation is (x − 3)² + (y − 4)² = 8.
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➗ MathFree
Equation of a plane
The plane through (1, 0, 0), (0, 1, 0) and (0, 0, 1) has a, b and c all equal to 0.57735026919 and d equal to −0.57735026919.
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➗ MathFree
Equilateral triangle area calculator
A side of 10 gives an equilateral triangle an area of about 43.301270, and a side of 2 gives √3, about 1.732051.
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➗ MathFree
Equivalent fractions calculator
Scaling 3/4 by 2 gives 6/8, and scaling it by 5 gives 15/20: the same value written with a bigger denominator.
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➗ MathFree
Equivalent ratio calculator
Scaling 3:4 by 5 gives 15:20, and both still equal 0.75, so the proportion has not changed. Enter a ratio and any non-zero factor, including 0.5 to scale down…
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➗ MathFree
Error function calculator
erf(1) is 0.842700689748 and erfc(1) is 0.157299310252: the two numbers you need for normal probabilities, heat spread and measurement uncertainty.
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➗ MathFree
Euclidean algorithm calculator
For 1071 and 462 the greatest common divisor is 21, reached in three divisions: 1071 = 462 × 2 + 147, then 462 = 147 × 3 + 21, then a remainder of zero.
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➗ MathFree
Euclidean distance calculator
From [0, 0] to [3, 4] the distance is exactly 5, and from [0, 0, 0] to [1, 2, 2] it is 3. Enter two vectors of the same length, in any number of dimensions, and…
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➗ MathFree
Euler's polyhedron formula calculator
A cube with 8 vertices and 12 edges must have 6 faces, so give any two counts and the third follows from Euler's rule that vertices minus edges plus faces…
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➗ MathFree
Exact value of trig functions
A calculator shows sin 45° as 0.70710678; this gives you the exact √2/2 that textbooks and exams expect.
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➗ MathFree
Expanded form calculator
Type 204.75 and get 200 + 4 + 0.7 + 0.05: every non-zero digit becomes a term worth its place value, and the terms always add back to your number.
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➗ MathFree
Expanding logarithms
Log base 2 of x·y/z becomes log₂(x) + log₂(y) − log₂(z). List each factor and say whether it multiplies, divides or carries a power, and you get one term per…
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➗ MathFree
Exponent calculator
2 to the power of 10 is 1024. Enter any base and exponent, negative or fractional ones included, and get the exact power.
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➗ MathFree
Exponential form
1234.5 becomes 1.2345 × 10^3 and 0.00072 becomes 7.2 × 10^-4. Type any finite number, plain or already in scientific notation, and get its mantissa, its power…
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➗ MathFree
Exponential function calculator
Start at 2, triple for 4 periods and you reach 162. Enter the coefficient a, the base b and the exponent x to get a·b^x for growth, decay or any scaled power…
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➗ MathFree
Exterior angles of a triangle calculator
Interior angles of 60, 70 and 50 degrees give exterior angles of 120, 110 and 130, which always total 360.
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📄 Documents & PDFFree
Booklet imposition sheets calculator
A 22-page booklet needs six folded sheets, which hold 24 pages, so two blank pages must be added. Enter the total page count, covers included, to get the…
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📄 Documents & PDFFree
Duplex pages to sheets calculator
A 7-page document printed on both sides needs 4 sheets, with 7 printed sides and 1 blank. Enter the page count to get sheets, printed sides and blank sides for…
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📄 Documents & PDFFree
Leaflet panels from folds calculator
A tri-fold leaflet printed on both sides gives you 6 panels to fill: two folds make three sections, and each section has a front and a back.
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💰 Finance & moneyFree
Rent vs Buy Equipment Calculator
Decide whether to hire or buy a tool or machine: 12 days at 85 a day plus 120 in fees cost 1,140 to rent, while buying for 1,200 plus 90 and reselling for 350…
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➗ MathFree
Most frequent value calculator
In red, blue, red, green, red, blue the most frequent value is red, which appears 3 times; blue follows with 2 and green with 1.
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➗ MathFree
Percent change between values calculator
Going from 80 to 100 is a 25% increase, yet going from 100 back to 80 is only a 20% decrease. Enter the old and the new value to get the signed percentage, the…
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✍️ Text & AIFree
Total monthly subscriptions cost calculator
See what your subscriptions really cost per month: with streaming and news billed monthly and cloud storage billed yearly, the yearly plan turns out to be 26.3…
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✍️ Text & AIFree
Spell out dollar amount calculator
Turn 1250.50 into one thousand two hundred fifty dollars and fifty cents, the written line that invoices, contracts and settlement letters ask for.
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🧭 Travel & geographyFree
Overnight layover cost calculator
One hotel night at 145, three meals of 22.5 for each of two travelers and 48 in transfers bring an overnight layover to 328, so it still beats a 390…
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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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