All Free Tools

A clean browser calculator for quick arithmetic, percent checks, and copied results.

Find percent-of answers, percent change, discounts, and original values with reverse percentages.

Simplify ratios, scale matching ratios, and split totals by ratio parts.

Compare your measured value with the accepted value, then see percent error and direction.

Calculate remaining amount, elapsed time, or half-life with decay steps.

Calculate powers, zero and negative exponents, simple fraction exponents, and scientific notation.

Calculate logarithms with custom bases, ln, log10, exponent checks, and change-of-base steps.

Calculate square roots, cube roots, nth roots, exponent form, real-number rules.

Solve quadratic equations with real or complex roots, discriminant, graph details, and steps.

Add, subtract, multiply, divide, and convert binary numbers.

Add, subtract, multiply, divide, and convert hex numbers, then check decimal and binary output.

A cute pastel calculator for quick everyday math.

A free scientific calculator for trig, inverse trig, logs, roots, powers, constants, and DEG/RAD mode.

Calculate, simplify, compare, and convert fractions, mixed numbers, whole numbers, and decimals with steps.

Find the least common multiple of positive whole numbers for fractions, schedules, and divisibility checks.

Find the greatest common factor of two or more whole numbers with steps.

List factors, factor pairs, and prime factorization for a whole number.

Round decimals, significant figures, and place values using clear method steps.

Add, subtract, multiply, transpose, and find determinants for 2x2 and 3x3 matrices.

Convert standard numbers to scientific notation or expand powers of 10 back to standard form.

Add, subtract, multiply, and divide very large whole numbers exactly, then copy grouped or raw results and verify division remainders.

Calculate sample or population standard deviation with variance, mean, count, and steps.

Generate arithmetic, geometric, and Fibonacci-style sequences with formulas, next terms, and copyable results.

Estimate survey sample size from confidence level, margin of error, and proportion.

Calculate P(A or B), P(A and B), complements, and independent-event probability checks.

Calculate count, sum, mean, median, mode, range, quartiles, IQR, variance, and sample or population standard deviation.

Find mean, median, mode, range, sorted values, sum, count, min, max, and quick steps for a list of numbers.

Calculate nPr and nCr for order-matters and order-does-not-matter counting problems.

Calculate a z-score and approximate standard normal percentile.

Calculate z confidence intervals for a sample mean or sample proportion.

Check three triangle sides, find a possible third-side range, or calculate SSS area, perimeter, angles, and type.

Find cubic volume for boxes, cubes, cylinders, spheres, and cones.

Find slope, rise, run, and a line equation from two points.

Calculate flat-shape area for rectangles, triangles, circles, trapezoids, and parallelograms.

Straight-line distance between two 2D points, plus distance squared, deltas, midpoint, and formula steps.

Find radius, diameter, circumference, and area from one circle measurement.

Calculate surface area for boxes, cubes, cylinders, spheres, and cones.

Solve hypotenuse or missing leg lengths with a^2 + b^2 = c^2 and formula steps.

Solve a right triangle from two sides, including the missing side, area, perimeter, and acute angles.

Generate random numbers in a custom range, with unique, sorted, and copied results.

Find absolute value, distance from zero, and absolute difference between two numbers.

Break a whole number into prime factors, prime powers, and factor checks.

Divide whole numbers with quotient, remainder, decimal answer, and steps.

Find the average (arithmetic mean) of a number list, then compare median, mode, range, sum, and count.

Estimate left-tailed, right-tailed, or two-tailed standard-normal p-values from a z-score.

Estimate monthly principal, interest, taxes, insurance, PMI, and HOA costs.

Solve for monthly payment, loan amount, interest rate, or payoff term for a fixed-rate loan.

Estimate a car payment from vehicle price, tax, fees, down payment, trade-in, rate, and term.

Compare simple interest and compound interest from principal, annual rate, time, and deposits.

Estimate a fixed loan payment from amount financed, rate, and term.

Project retirement savings from current balance, monthly contributions, and return.

Estimate payoff time, total interest, and extra-payment savings.

Project investment growth from starting money, monthly deposits, return, and time.

Estimate future cost and buying power from an annual inflation rate.

Project a future balance from starting money, monthly deposits, rate, and time.

Estimate 2026 U.S. federal income tax from income, filing status, deduction, credits, and brackets.

Estimate compound growth with deposits, rate, time, and compounding frequency.

Convert annual salary to monthly, biweekly, weekly, daily, and hourly pay.

Find the rate hidden inside a fixed loan payment quote.

Find sales tax and final total from a subtotal and local rate.

Convert money with a manual exchange rate and optional exchange fee.

Estimate early mortgage payoff time, interest saved, and months saved from extra principal payments.

Project 401K growth from salary contributions, employer match, return, and time.

Estimate a home price from income, debts, down payment, rate, and housing costs.

Project a savings goal from current balance, monthly deposits, rate, and time.

Estimate annual percentage yield from a stated rate and compounding frequency.

Estimate how much rent may fit after income, debts, utilities, and a rent target.

Estimate future value and present value for a fixed payment stream.

Estimate credit card payoff months, interest, total paid, and final payment.

Estimate a defined-benefit pension from final salary, credited service, and plan multiplier.

Estimate a fixed payout from a lump sum, annual rate, payout term, and payment frequency.

Estimate a combined credit card payoff from balance, weighted APR, regular payment, and extra payment.