Biology
Seed Calculator
Plan your garden with the right spacing, seed count and growing area.
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65 calculatorsStatistics
confidence interval calculator
Find the confidence interval around your estimate.
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nm to ft lbs
Convert torque between newton meters and foot-pounds.
Open calculatorFinance
Mortgage & Loan Calculator
Estimate monthly payments and total interest for a fixed-rate loan.
Open calculatorEcology
Carbon Footprint & Solar Offset Calculator
Estimate energy-related emissions using your chosen emission factor.
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mg to mL Calculator
Convert mass to volume using density or concentration.
Open calculatorTime & Date
Age Calculator
Calculate age in years, months and days, total days lived, and your next birthday on any date.
Open calculatorBiology
Dog Pregnancy Calculator
Estimate a dog’s delivery window from first breeding, ovulation or an LH surge, with the reference event shown clearly.
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Dog Size Calculator
Project a puppy’s weight at 52 weeks using a transparent rule of thumb, with kg and lb results and clear limitations.
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Dog Age Calculator
Compare dog years with human years using a general guideline or a separately labeled Labrador research model.
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Cat Age Calculator
Compare cat years with human years and view the separate chronological life stage for ages 1–25.
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Soil Calculator
Find soil volume for rectangular or circular beds, whole-bag counts and bag costs in metric or imperial units.
Open calculatorChemistry
Atom Calculator
Find protons, neutrons and electrons from atomic number, mass number and ionic charge, with worked examples and input checks.
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Atomic Mass Calculator
Estimate atomic mass from proton and neutron counts, convert u to kg, and understand why mass number is not measured isotope mass.
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Average Atomic Mass Calculator
Calculate a weighted average from isotope masses and percentage abundances, with a strict 100% abundance check and worked calculation.
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Bond Order Calculator
Find molecular orbital bond order using bonding and antibonding electron counts, with examples and clear limits on interpretation.
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Chemical Name Calculator
Build names and balanced formulas for supported ionic compounds using cations and anions, including variable-charge metals and polyatomic ions.
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Effective Nuclear Charge Calculator
Estimate effective nuclear charge with Slater’s rules for occupied subshells of neutral H–U atoms, including a shielding breakdown.
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Electron Configuration Calculator
Find full and noble-gas ground-state electron configurations for neutral H–U atoms, with shell populations and recognised filling exceptions.
Open calculatorConstruction
Board Foot Calculator
Calculate board feet, entered-dimension lumber volume, an optional allowance and cost from thickness, width, length and board count.
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Cubic Yard Calculator
Find cubic yards from dimensions for rectangular, round, triangular and ring-shaped sections, with separate net volume, allowance and cost.
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Gallons per Square Foot Calculator
Calculate liquid gallons per square foot and total volume from area and depth, or recover base area from volume and depth, with US and imperial units.
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Size to Weight Calculator (Rectangular Box)
Estimate mass from rectangular dimensions and density, or density from measured mass, for solid blocks and ideal closed hollow shells.
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Square Feet to Cubic Yards Calculator
Convert a known area and layer depth into cubic yards, cubic feet and cubic meters, with an explicit optional allowance and cost.
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Square Footage Calculator
Add and subtract up to twenty rectangular, circular, triangular, trapezoidal or ring-shaped areas, with square feet, square yards and square meters.
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Square Yards Calculator
Find square yards from dimensions or a known area, compare price-per-area quotes, and separate net area from a chosen purchasing allowance.
Open calculatorStatistics
Accuracy Calculator
Binary Accuracy Calculator: correct predictions, balanced accuracy, sensitivity and specificity from TP, FP, FN and TN.
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ANOVA Calculator
Run a classical one-way ANOVA from raw independent groups. Get the ANOVA table, F statistic, upper-tail p-value and eta squared.
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Bayes' Theorem Calculator
Update a prior probability using evidence likelihoods. Calculate posterior probability, total evidence probability and the likelihood ratio.
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Bertrand's Box Paradox
Solve Bertrand’s coin-box paradox with adjustable box priors and a uniformly observed gold or silver coin.
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Bertrand's Paradox
Compare random-chord probabilities under uniform endpoints, uniform center distance and disk-area midpoint sampling.
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Birthday Paradox Calculator
Calculate any-pair birthday collision probability and the minimum group size for a target, with adjustable uniform bucket count.
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Boy or Girl Paradox
Compare two-child conditional probabilities across at-least-one, older-child, random-child and independent-tag observation protocols.
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Chebyshev's Theorem Calculator
Find Chebyshev’s distribution-free coverage bound or the interval width required for a target, using a population mean and standard deviation.
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Coin Flipper
Flip a virtual coin with adjustable heads probability. Generate independent samples, heads/tails counts and a readable sequence preview.
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Coin Flip Probability Calculator
Calculate exact, at-least or at-most heads probabilities for independent fixed-probability coin flips using the binomial model.
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Coin Toss Streak Calculator
Calculate the probability of at least one head-only or either-side streak in a fixed number of flips, accounting for overlapping runs.
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Combination Calculator
Count unordered selections exactly with or without repetition. Use integer combinations for subsets and multisets without factorial overflow.
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Conditional Probability Calculator
Calculate both conditional directions from event marginals and a joint probability, with feasible-table checks and undefined-case handling.
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Confusion Matrix Calculator
Build a labeled binary confusion-matrix report with precision, recall, specificity, F1, balanced accuracy and Matthews correlation coefficient.
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Dice Average Calculator
Find expected total, variance, standard deviation and range for mixed fair-dice expressions with fixed integer modifiers.
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Dice Probability Calculator
Calculate fair-dice sum and chosen-face event probabilities with convolution or binomial counting, including exact and cumulative events.
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Dice Roller Calculator
Roll independent fair virtual dice in batches using unbiased integer sampling. View totals and compare observed and theoretical averages.
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Expected Value Calculator
Calculate a finite discrete expected value, variance and standard deviation from net outcomes and a complete probability table.
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False Positive Paradox Calculator
Explain base-rate effects with posterior precision and expected natural-frequency counts from prevalence, sensitivity and specificity.
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Implied Probability Calculator
Convert decimal, fractional and American odds to raw implied probabilities; optionally calculate complete-market overround and proportional shares.
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Joint Probability Calculator
Find an intersection probability from a marginal and conditional rate, an explicit independence assumption, or a joint count.
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Lottery Calculator
Calculate exact-match probabilities for one unordered lottery ticket, with an optional separate independent bonus pool.
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Monty Hall Problem Calculator
Compare staying and uniform switching under an informed-host Monty Hall protocol, with optional aggregate simulation.
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Odds Calculator
Convert success/failure weights into event odds and probability, then compare all-success and at-least-one independent repetition events.
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Parrondo's Paradox Calculator
Compare standalone and randomly mixed capital-dependent Parrondo games using finite-state expectations and stationary drift.
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Password Combination Calculator
Count policy-valid ordered character strings across a length range, with optional required disjoint character groups.
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Permutation Calculator
Count ordered distinct selections, repeated strings and fixed-multiplicity arrangements with exact integer arithmetic.
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P-Hat Calculator
Calculate an unweighted sample proportion and its plug-in binomial standard error from observed success and trial counts.
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Post-Test Probability Calculator
Update pre-test probability after a positive or negative result using test rates or a known likelihood ratio for that result.
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Probability Calculator
Calculate both, inclusive OR, exactly one and neither for two events under an explicit relationship model.
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Probability of 3 Events Calculator
Validate and calculate three-event probabilities from mutual independence or a full set of pairwise and triple intersections.
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Quiz: Dice Average Calculator
Practice six fair-dice mean and variance questions with numerical answer checks, explanations and session scoring.
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Quiz: Lottery Calculator
Practice six small lottery-counting questions with worked feedback and clearly labeled integer or decimal-probability answers.
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Random Number Generator
Generate uniform integers within inclusive bounds, allowing repeats or sampling without replacement using browser randomness.
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Relative Risk Calculator
Compare two observed group risks with a risk ratio, risk difference and supported approximate 95% log interval.
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Risk Calculator
Calculate expected loss from a hypothetical event probability and loss magnitude, while keeping consequence and spread separate.
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Roulette Payout Calculator
Check standard hypothetical roulette net profit, gross winning return, event probability and expected net result for two wheel sizes.
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Sensitivity and Specificity Calculator
Estimate sensitivity, specificity and positive/negative likelihood ratios from labeled validation counts without inventing undefined rates.
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Two Envelopes Paradox Calculator
Compare unopened-envelope expectations and observed-amount updates under an explicit finite prior for the smaller amount.
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Joint Probability in Dependent Draws: Update the Second Factor
The second draw sees a changed pool A bag contains five red and five blue tokens. Draw two tokens without replacement. The probability of two reds is.
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Joint Counts and Conditional Counts Use Different Denominators
Choose the full population for a joint rate Suppose 100 inspected items include 40 from supplier A and 12 that are both from A and flagged. The joint.
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Count Exact Lottery Matches with a Hypergeometric Model
Count unordered tickets first In a teaching lottery that draws two distinct numbers from five, an unordered two-number ticket has C(5,2) = 10.
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A Separate Bonus Pool Is Not a Leftover Main-Pool Ball
Two mechanisms can both be called a bonus ball A bonus number drawn from a separate machine or pool can form an independent event under the stated model..
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