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💰 Finance & moneyFree
Interest rate calculator
If 1,000 grows to 1,210 over 2 periods, the implied interest rate is 10% per period. Enter a starting amount, a future amount and the number of periods to back…
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💰 Finance & moneyFree
Intrinsic value calculator
With yearly cash flow of 10,000,000 growing 5%, a 10% discount rate, a 10-year forecast and 1,000,000 shares, each share is worth 210.
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💰 Finance & moneyFree
Investment fees calculator
On 10,000 earning 7% a year for 30 years, a 1% annual fee costs 18,687.64: you end with 57,434.91 instead of 76,122.55.
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💰 Finance & moneyFree
Labor cost calculator
40 hours at 25 an hour with a 30% payroll burden cost the employer 1,300, not 1,000: a fully loaded rate of 32.5 an hour.
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💰 Finance & moneyFree
Land loan payment calculator
Financing 80,000 of land at 8.5% over 120 months means a fixed payment of 991.89 a month and 39,026.8 in total interest.
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💰 Finance & moneyFree
Lease mileage calculator
Return a leased car with 42,000 miles on a 36,000-mile allowance at 0.15 a mile and you owe 900 for 6,000 extra miles.
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💰 Finance & moneyFree
Lerner index calculator
A product priced at 10 with a marginal cost of 6 has a markup of 4 and a Lerner index of 0.4. Read market power as a single number without units, from zero at…
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💰 Finance & moneyFree
Lifetime earnings calculator
A salary of 50,000 rising 3% a year adds up to 265,456.79 over 5 remaining working years, with 56,275.44 paid in the final year.
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💰 Finance & moneyFree
Liquid net worth calculator
With 25,000 in cash, 40,000 in securities and 5,000 in other liquid assets against 12,000 of current debts, your liquid net worth is 58,000.
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💰 Finance & moneyFree
Loan comparison calculator
Borrowing 25,000 at 5.5% over 36 months costs 2,176.4 in interest; at 7.9% over 48 months it costs 4,239.2, even though the payment is 145.75 lower.
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💰 Finance & moneyFree
Loan interest calculator
Borrowing 10,000 at 6% for 5 years means 60 payments of 193.33 and 1,599.68 in total interest. See the full cost of a fixed-rate loan before you sign, not just…
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💰 Finance & moneyFree
Loss ratio calculator
Incurred losses of 650,000 against earned premiums of 1,000,000 give a loss ratio of 65%: 65 cents of every earned premium dollar went to claims.
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💰 Finance & moneyFree
Lost wages assistance calculator
A weekly benefit of 300 paid for 6 eligible weeks adds up to 1,800. Turn a FEMA supplement, an unemployment benefit or a stipulated weekly wage into the total…
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💰 Finance & moneyFree
LTV calculator
A 320,000 loan on a property appraised at 400,000 has a loan-to-value of 80%, the usual line before private mortgage insurance.
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💰 Finance & moneyFree
Lumpsum plus SIP calculator
Investing 100,000 today plus 5,000 a month at 12% a year grows to 1,480,232.14 in 10 years, from 700,000 actually put in.
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💰 Finance & moneyFree
Margin calculator
Revenue of 100,000 with 60,000 in cost of goods sold leaves 40,000 of gross profit, a 40% margin: 40 cents of every sales dollar.
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💰 Finance & moneyFree
Margin call calculator
Buy a share at 40 with 50% initial margin under a 25% maintenance requirement, and your broker calls for more cash if the price falls to twenty-six and two…
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💰 Finance & moneyFree
Margin-discount calculator
To keep a 25% margin on an item costing 60 while advertising 20% off, print 100 on the ticket: after the discount it sells for 80, and 20 of that is profit.
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💰 Finance & moneyFree
Marginal cost calculator
If producing 10 more units raises total cost by 50, each extra unit costs 5. Turn two production snapshots into the cost of one more unit for pricing, a cost…
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➗ MathFree
Bertrand paradox calculator
With both ends picked at random on the circle, a chord is longer than the side of the inscribed equilateral triangle with probability 1/3, while two other…
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➗ MathFree
Chebyshev's theorem calculator
At least 75 percent of any data set with a finite variance lies within 2 standard deviations of its mean, bell-shaped or not.
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➗ MathFree
Coin flipper
Ten fair flips with seed 42 always give the same sequence, THTTHTHTTH: 4 heads and 6 tails. Change the number of flips or the seed to run a new experiment and…
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➗ MathFree
Combinations without repetition
Choosing 3 items from 10 distinct ones, with no repeats and order ignored, gives 120 combinations.
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➗ MathFree
Confusion matrix calculator
Eight cases compared with their predictions give 3 true positives, 3 true negatives, 1 false positive and 1 false negative.
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➗ MathFree
Critical value calculator
At a 0.05 significance level the critical z is about 1.96 for a two-tailed test and about 1.645 for a one-tailed one.
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➗ MathFree
D20 dice roller
Seed 42 always lands on 17: the same seed always gives the same face of a fair twenty-sided die, so a game master, a player or a reviewer can check the roll…
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➗ MathFree
Decimal random number generator
With bounds 0 and 1 and seed 42 you always get 0.2523451748: the same bounds, seed and number of decimals replay the same draw.
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➗ MathFree
Dice expected value and variance
One fair six-sided die has an expected value of 3.5 and a variance of 35/12. Enter the sides and the number of rolls to get both figures for the sum: how large…
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➗ MathFree
Dispersion calculator
For 2, 4, 4, 4, 5, 5, 7 and 9 you get a range of 7, a variance of 4 and a standard deviation of 2, all three at once.
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➗ MathFree
D&D dice roller
Type 2d6+3 with seed 42 and you get faces 1 and 5 plus the modifier 3, for a total of 9, every time.
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➗ MathFree
Error propagation calculator
Multiply 2 ± 0.1 by 3 ± 0.2 and you get 6 with a combined standard uncertainty of 0.5, plus the share each input adds.
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➗ MathFree
False positive rate calculator
5 false alarms among 100 truly negative cases give a false positive rate of 0.05: 5 false positives divided by 5 plus 95 true negatives.
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➗ MathFree
Fisher's exact test calculator
The 2x2 table 8, 2, 1, 5 gives a two-sided p-value of 5/143, below the usual 0.05 level. Fisher's exact test stays exact with small samples and near-empty…
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➗ MathFree
Fractional odds converter
Enter a fractional price and see its three other faces: 5/2 becomes decimal odds of 3.5, an implied chance of about 28.57% and 2.5 units of profit for every…
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➗ MathFree
Histogram calculator
Get the frequency table behind a histogram: the values 1, 2, 2, 3, 5, 7, 8 and 9 split into four bins of width 2 give counts of 3, 1, 1 and 3.
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➗ MathFree
Hypergeometric distribution
Find the chance of drawing an exact number of marked items without putting any back: from an urn of 10 balls with 4 red, drawing 3 gives exactly one red with…
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➗ MathFree
IQR calculator
Get the spread of the middle half of your data: for the numbers 1 to 8, Q1 is 2.5, Q3 is 6.5 and the interquartile range is 4.
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➗ MathFree
Joint probability calculator
Work out the chance that two events both happen: with P(A) of 0.5 and P(B) of 0.4, independent events give 0.2, or 20%.
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➗ MathFree
Lottery jackpot probability
Work out your exact chance of hitting a lottery prize: in a 6-from-49 game, matching all six numbers is 1 in 13,983,816, and you can ask for lower tiers such as…
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➗ MathFree
MAD calculator
Find how far your numbers sit from their mean on average: for 2, 4, 4, 4, 5, 5, 7 and 9 the mean is 5, the distances add up to 12 and the mean absolute…
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➗ MathFree
McNemar's test calculator
For the paired counts 59, 6, 16 and 80, McNemar's test uses only the 22 discordant pairs and gives a p-value just above 0.05, so the change is not significant…
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➗ MathFree
Median calculator
For 1, 3, 3, 6, 7, 8 and 9 the median is 6, with three values on each side. Paste the numbers in any order: they are sorted for you, and an even count takes the…
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➗ MathFree
MSE calculator
Four predictions whose squared misses add up to 0.6 give a mean squared error of 0.15. Paste the predicted and actual values in matching order; each gap is…
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➗ MathFree
Normal approximation calculator
For 100 trials with a 0.5 chance of success, the normal approximation puts the chance of exactly 50 successes at about 8%, using a mean of 50, a standard…
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➗ MathFree
Or probability calculator
With P(A) of 0.3, P(B) of 0.4 and an overlap of 0.1, the chance that A or B happens is 0.6: add both, then subtract the overlap once so it is not counted twice.
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➗ MathFree
Order from least to greatest
Enter 5, 1, 4, 2, 3 and get 1, 2, 3, 4, 5: smallest first, largest last. Duplicates stay, and numbers are compared by value, not as text, so 10 never lands…
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➗ MathFree
Password combination calculator
Twenty-six lowercase letters and 8 characters give 208,827,064,576 possible passwords. Enter how many symbols each position can use and how long the password…
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➗ MathFree
Permutation with repetition
The letters of BANANA can be rearranged into 60 distinct words: 6 letters, with A three times and N twice.
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➗ MathFree
Pie chart percentage calculator
The amounts 1, 1 and 2 add up to 4, so they become a quarter, a quarter and half of the pie. Paste your category values and get slice percentages that always…
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➗ MathFree
Post-test probability calculator
With a pre-test probability of 0.01, a positive result on a test with sensitivity 0.9 and specificity 0.95 raises the chance of disease only to 0.153846153846.
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➗ MathFree
Probability to fraction converter
A probability of 0.25 becomes the reduced fraction 1/4, and 0.375 becomes 3/8. Enter any probability from 0 to 1 and get the simplified numerator and…
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➗ MathFree
Quartic regression calculator
Data from x⁴+2x³−x²+3x+5 at x of 0 to 4 returns the coefficients 1, 2, −1, 3 and 5 with an R² of 1.
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➗ MathFree
Random dice roller
Two six-sided dice with seed 42 land on 1 and 5 for a total of 6, out of a possible 2 to 12. Choose how many identical dice to throw, how many sides each has…
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➗ MathFree
Relative error calculator
A reading of 105 against a true value of 100 misses by 5, a relative error of 0.05 or 5%. Enter the measured and the true value to get the absolute relative…
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➗ MathFree
Sampling distribution of a sample proportion
With a true share of 0.6 and samples of 100, the sample proportion centres on 0.6 with a variance of 0.0024 and a standard deviation equal to its square root.
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➗ MathFree
Skewness calculator
The list 1, 2, 3, 4, 10 has a mean of 4 and a positive skewness, because the 10 stretches the right tail.
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➗ MathFree
Standard error calculator
A sample standard deviation of 10 with 25 observations gives a standard error of exactly 2, since 10 is divided by the square root of 25.
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➗ MathFree
Two dice probability
Pick a total from 2 to 12 and see how many of the 36 rolls of two dice produce it: a 7 comes up in 6 ways, so 6/36 or 1/6.
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➗ MathFree
Weibull distribution calculator
Get the Weibull density or cumulative probability at a point: with shape 2, scale 1 and x of 1 the density is 2/e.
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📏 Unit convertersFree
Acres to square miles converter
640 acres make exactly one square mile, so this converter divides your acreage by 640 and turns farm, ranch or parcel figures into the square-mile scale used…
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Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
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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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