Math & Money Calculators

Find a percentage of a number, what percent one number is of another, a percentage increase or decrease, or a number raised or lowered by a percentage.

Find the mean, median, mode, range, quartiles, variance and standard deviation of a list of numbers, with exact decimal arithmetic.

Add, subtract, multiply and divide fractions, mixed numbers and decimals, simplify to lowest terms and see the steps.

Find the sale price after a percent off, the percent off between two prices, or the original price, with extra discounts and sales tax.

Work out the tip and total for a bill, on the amount before or after tax, split between people with the cents shared out exactly.

Break any whole number up to 18 digits into its prime factors, with division steps, all divisors and a prime check.

Find the greatest common divisor and least common multiple of two or more whole numbers, with the Euclidean algorithm steps.

See how a starting amount and monthly deposits grow with compound interest, year by year, with the effective annual rate.

Work out the monthly payment on a fixed-rate loan, the total interest and a full amortization schedule, with optional extra payments.

Add sales tax to a price or take it out of a total, at any rate, with the tax rounded to the cent so the parts always add up.

Add VAT to a net price or remove it from a gross price at any rate, with the VAT rounded to the cent so net plus VAT equals gross.

Estimate your US federal income tax for 2026 or 2025 from the official IRS brackets and standard deduction, with every bracket shown.

Work out US self-employment tax for 2026 or 2025: Social Security, Medicare, Additional Medicare and the deduction for half of it.

Turn a yearly salary into an hourly wage, or an hourly wage into a yearly salary, with weekly, monthly and daily pay for your hours.

Work out profit margin and markup from a cost and a price, or find the price or cost for the margin or markup you want.

Estimate US federal tax on long-term and short-term capital gains for 2025 and 2026, with the 0%, 15% and 20% rates and the 3.8% investment income tax.

Estimate your take-home pay from a salary or hourly wage after Social Security, Medicare, federal income tax, state tax and deductions.

Work out overtime pay from your hourly rate and hours, with time and a half or double time, several rates in one week and the regular rate.

Estimate quarterly federal tax for freelancers and the self-employed: income tax plus self-employment tax, the safe harbor and four payments.

Find the standard deviation, variance, mean and more for a list of numbers, as a sample or a population, with the working shown.

Add up hours worked each day from start and end times and unpaid breaks, get the weekly total and decimal hours, and work out pay with overtime.

Find the units and the revenue you need to cover your fixed costs, plus the units for a target profit and the margin of safety.

Work out return on investment as a percentage, with income received, the return multiple and the annualized rate over the time you held it.

Find the monthly deposit you need to reach a savings goal in a set time, or how long a fixed monthly deposit takes, with compound interest.

Count the working days between two dates, or add or subtract business days from a date, skipping weekends and the holidays you list.

Count permutations (nPr) and combinations (nCr), with or without repeats, plus factorials, as exact whole numbers.

Solve ax^2 + bx + c = 0 for real or complex roots, with the discriminant, exact form, vertex and factored form.

Turn a value into a z-score, a z-score into probabilities and percentiles, or a percentile back into a z-score, using the standard normal distribution.

Find the compound annual growth rate between two values, the value after growing at a rate, or the time to reach a target, with the doubling time and rule of 72.

See how many months a fixed payment takes to clear a credit card balance, the interest it costs, or the payment needed to be debt free by a date.

Find the chance of exactly, at most or at least k successes in n trials, with the mean, standard deviation and a chart of the whole distribution.

Simplify a ratio, list equivalent ratios, solve A : B = C : D for the missing term, and scale or split a total in a ratio.

Work out the net present value and internal rate of return of a list of cash flows, with the payback period, discounted payback and profitability index.

Convert a nominal annual rate (APR) to the effective yearly rate (APY) and back for any compounding, and see the balance after a number of years.

Find the simple interest, the principal, the rate or the time from the other values, with the total amount and a comparison with compound interest.

Solve for the future value, present value, payment, time or interest rate of savings or a loan, with a balance table.

Find how many survey responses you need for a confidence level and margin of error, or the margin of error a sample gives.