All Free Tools

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

Find percent-of answers, percent change, discounts, markups, and 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 with positive, negative, zero, decimal, and fraction exponents.

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

Calculate square roots, cube roots, nth roots, exponent form, and steps.

Solve ax^2 + bx + c = 0 with roots, discriminant, vertex, and steps.

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

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

A cute pastel calculator for quick everyday math.

A free scientific calculator for trig, logs, roots, powers, and constants.

Add, subtract, multiply, divide, and simplify fractions with steps.

Find the least common multiple of two or more whole numbers with steps.

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 numbers by decimal places, significant figures, or place value.

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

Convert numbers to scientific notation or back to standard form.

Add, subtract, multiply, and divide very large whole numbers exactly, including division remainders.

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

Generate arithmetic, geometric, and Fibonacci-style number sequences.

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

Calculate event union, intersection, complements, and independent-event probability.

Calculate count, sum, mean, median, mode, range, quartiles, variance, and standard deviation.

Find the four headline descriptive statistics for a list of numbers.

Calculate nPr and nCr for counting arrangements and selections.

Calculate a z-score and approximate standard normal percentile.

Calculate z confidence intervals for a mean or a proportion.

Find triangle area, perimeter, angles, and type from three side lengths.

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.

Find distance, delta x, delta y, and midpoint from two coordinate points.

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

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

Solve a missing right-triangle side with a^2 + b^2 = c^2.

Solve right triangle sides, area, perimeter, and acute angles.

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

Break a whole number into prime factors and grouped prime powers.

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

Find the average of a list, plus count, sum, median, mode, and range.

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

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

Estimate a fixed monthly loan payment, total paid, and total interest from amount, rate, and term.

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 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.

Check how fast a fixed debt can disappear when you pay the regular amount plus extra.

Compare your current payoff path with a new consolidation loan before you trust the lower payment.

Estimate payoff time, interest, total paid, and final payment for one fixed balance.

Estimate a standard student loan payment, interest, payoff time, and extra-payment savings.

Project future college costs and the gap your savings may need to cover.

Estimate simple interest and ending balance from principal, annual rate, and time.

Estimate CD maturity value, interest earned, and early-withdrawal penalty what-if.

Estimate coupon income, current yield, and rough yield to maturity for a plain bond.

Project a mutual fund balance before and after simple expense-ratio drag.

Project Roth IRA growth before checking IRS contribution and income rules.

Project traditional or Roth IRA growth before checking IRS contribution and deduction rules.

Add VAT to a net price or remove VAT from a gross price without mixing up the mode.

Compare a cash-back rebate with a low-interest APR offer by total cost.

Estimate a car lease payment by separating depreciation, finance charge, and tax.

Estimate depreciation expense, accumulated depreciation, and book value.

Estimate net gain, cumulative return, average annual return, and CAGR.

Calculate profit, profit margin, and markup from selling price and cost.

Find final price after one or two discounts and optional tax.

Estimate a business loan payment, total interest, origination fee, cash received, and total cost.

Calculate debt-to-income ratio from income, debts, and proposed housing payment.

Estimate personal loan payment, interest, and origination fee.

Estimate monthly boat loan payment, amount financed, sales tax, and interest.

Estimate a generic lease payment from asset value, residual, rate, term, fees, and upfront payment.

Compare current loan payment with a new refinance payment and break-even estimate.

Add monthly income, spending, debt, and savings to see leftover money and ratios.

Estimate website ad revenue from page views, page CTR, average CPC, and page RPM.