Arithmetic calculators

86 free calculators for everyday math. Each shows step-by-step solutions.

• Fraction calculator— Add, subtract, multiply, divide fractions and mixed numbers
• Decimal to fraction— Convert any decimal to a fraction in simplest form
• Ratio & proportion— Simplify ratios and solve proportions
• Reciprocal (1/x)— Find the multiplicative inverse of any number
• Repeating decimal checker— Check if a fraction gives a repeating decimal
• Terminating decimal checker— Check if a fraction terminates or repeats
• Decimal places counter— Count digits after the decimal point

• Percentage calculator— Find percentages, percent of a number
• Percentage change— Calculate % increase or decrease between two values
• Percentage increase— Increase a value by a given percentage
• Percentage decrease— Decrease a value by a given percentage
• Discount calculator— Find sale price after applying a percentage discount
• Tip calculator— Calculate tip amount and total bill
• Markup calculator— Calculate selling price from cost + markup %
• Sales tax calculator— Tax amount and total price after tax

• Compound interest— Calculate how money grows with compound interest
• Simple interest— Calculate interest using I = P × r × t
• Future value— FV = PV × (1+r)ⁿ — investment growth
• Present value— How much to invest today for a future goal
• NPV (net present value)— Total present value of future cash flows
• IRR (internal rate of return)— Discount rate where NPV = 0
• Loan calculator— Monthly payment, total interest, amortization
• ROI calculator— Return on investment percentage and profit
• Depreciation— Straight-line depreciation and book value
• Annuity calculator— Annuity payments, present and future value
• Break even— Units needed to cover fixed costs

• Five number summary— Min, Q1, median, Q3, max
• Quartile calculator— Find Q1, Q2, Q3 for any data set
• IQR (interquartile range)— Spread of the middle 50% of data
• Outlier calculator— Detect outliers using 1.5×IQR rule
• Geometric mean— Nth root of the product — for growth rates
• Harmonic mean— Reciprocal of mean of reciprocals — for rates
• Weighted mean— Average with different weights per value
• RMS (root mean square)— Quadratic mean — for AC voltage, signal power
• Percentile calculator— Find the value at any percentile
• Percentile rank— What percentile does this value fall at?
• Midrange— Average of min and max
• Skewness— Measure distribution asymmetry
• Kurtosis— Measure distribution tailedness
• Correlation coefficient (r)— Strength of linear relationship between X and Y
• Covariance— How two variables change together
• Normal CDF— P(Z ≤ z) area under bell curve
• Normal PDF— Bell curve height f(x) at any point
• Expected value E(X)— Long-run average of a random variable
• Bayes' theorem— P(A|B) from prior probability and evidence
• Conditional probability— P(A|B) = P(A∩B)/P(B)

• Square root— Square roots, cube roots, and nth roots
• Nth root— Calculate ⁿ√x for any n
• Exponent calculator— Powers and exponents step by step
• Power (aⁿ)— Calculate any base to any exponent
• Powers of a number— Generate n¹, n², n³, ... table
• Modulo (remainder)— a mod b — remainder after division
• Absolute value— |x|, factorial, reciprocal
• Reciprocal (1/x)— Multiplicative inverse
• Ceiling ⌈x⌉— Round up to nearest integer
• Floor ⌊x⌋— Round down to nearest integer
• Divisibility checker— Is a number divisible by another?
• Long division— Step-by-step with remainder and decimal
• Long multiplication— All partial products shown
• Rounding— Round to any decimal place
• Significant figures— Count and round to sig figs
• Compare numbers— Which is greater? Difference and ratio
• Sort numbers— Ascending or descending order
• Max & min— Find the largest and smallest values
• Sum (1 to n)— Gauss formula: n(n+1)/2
• Product (a to b)— Multiply a range of integers

• Scientific notation— Convert to and from scientific notation
• Base converter— Binary, octal, decimal, hex conversion
• Binary calculator— Binary arithmetic and conversion
• Hex to decimal— Convert hexadecimal to decimal
• Octal to decimal— Convert octal (base 8) to decimal
• Roman numerals— Convert between Roman and decimal
• Number to words— Convert numbers to English words
• Place value— Place value chart and expanded form
• Expanded form— 3456 = 3000 + 400 + 50 + 6
• Trailing zeros— Count trailing zeros in a number

• Combinatorics— Permutations, combinations, factorials
• Binomial coefficient C(n,k)— "n choose k" calculation
• Pascal's triangle— Generate rows of binomial coefficients

• Date calculator— Days between dates, add/subtract days
• Age calculator— Exact age in years, months, and days
• Day of week— What day was any date?
• Leap year checker— Is this year a leap year?

• Coin flip simulator— Virtual coin toss
• Dice roller— Roll virtual dice
• Set operations— Union, intersection, difference
• Times table— Multiplication table for any number