All calculators

Mortgage & Housing

• Mortgage Calculator

  Monthly housing payment: principal and interest, property tax, insurance, HOA and PMI.

• Mortgage Extra Payment Calculator

  Interest and time saved by extra monthly, yearly or one-time principal payments.

• Refinance Break-Even Calculator

  When closing costs are recovered, and total cost over the time you expect to keep the loan.

• Rent vs. Buy Calculator

  Compare the net cost of renting and buying over a horizon with your own assumptions.

• Home Affordability Calculator

  Estimate a home price from income, debts, housing costs and debt-to-income limits you set.

Loans & Debt

• Loan Payment Calculator

  Fixed-rate payment with a full amortization schedule you can download.

• Auto Loan Calculator

  Car payment with down payment, trade-in, financed fees and your sales-tax treatment.

• Credit Card Payoff Calculator

  Months to pay off a card balance and total interest, including payments that never finish it.

• Debt Snowball vs. Avalanche Calculator

  Compare paying smallest balance first against highest rate first across several debts.

• Debt-to-Income Ratio Calculator

  Front-end and back-end debt-to-income ratios from monthly income and payments.

• APR Calculator

  Estimate the APR of a fixed-rate loan once fees are included.

Savings & Investing

• Simple Interest Calculator

  Interest on a principal at a flat rate, with the total and a year-by-year view.

• Compound Interest Calculator

  Growth with regular contributions, contribution timing and any compounding frequency.

• Savings Goal Calculator

  Find the monthly amount needed to reach a goal, or how long your current saving will take.

• ROI Calculator

  Net return on investment and annualized return from a start value, end value and dates.

• APY Calculator

  Convert a nominal rate to annual percentage yield for any compounding frequency, and back.

• CD Calculator

  Certificate of deposit value at maturity, with an optional early-withdrawal penalty.

• Dividend Reinvestment Calculator

  Dividend income and reinvestment growth with yield, price growth and tax assumptions.

• Dollar-Cost Averaging Calculator

  Purchase ledger with average cost basis and return at a valuation price you enter.

• CAGR Calculator

  Compound annual growth rate between two positive values over a period.

• Bond Price and Yield Calculator

  Price, current yield and yield to maturity for a plain fixed-coupon bond.

Retirement

• Retirement Savings Calculator

  Project savings at retirement in future dollars and in today’s dollars.

• Retirement Withdrawal Calculator

  How long savings last under fixed withdrawals, returns and inflation.

• FIRE Calculator

  Financial-independence target and time to reach it from your own spending and return assumptions.

• Roth vs. Traditional Calculator

  Compare after-tax outcomes of Roth and traditional contributions at the same out-of-pocket cost.

• Employer 401(k) Match Calculator

  Employer match from your pay, contribution rate and matching tiers, with a vesting assumption.

• Investment Fee Calculator

  What percentage and fixed fees cost over time, compared side by side.

Business Finance

• Profit Margin and Markup Calculator

  Price, cost, margin and markup from any two, with the difference explained.

• Break-Even Calculator

  Units and revenue needed to cover fixed costs, with contribution margin.

• NPV and IRR Calculator

  Net present value and internal rate of return for periodic cash flows, with root checks.

• Rental Property Calculator

  Cash flow, cap rate and cash-on-cash return from rent, vacancy, expenses and financing.

• Business Loan DSCR Calculator

  Debt-service coverage ratio and the loan payment your cash flow supports at a target DSCR.

Everyday Money

• Inflation Calculator

  Purchasing power over time at an inflation rate you enter.

• Discount Calculator

  Sale price after one discount or several stacked discounts, and the true combined percent off.

• Sales Tax Calculator

  Add sales tax to a price, or back tax out of a tax-inclusive total.

• Tip Calculator

  Tip on a bill and each person’s share, with pre-tax tipping and rounding options.

• Salary to Hourly Calculator

  Convert gross pay between hourly, weekly, monthly and annual using your hours and weeks.

• Emergency Fund Calculator

  Target for an emergency fund from essential expenses and months of coverage.

• Budget Calculator with Savings Rate

  Monthly and annual budget with savings rate; mix weekly, monthly and annual items.

• Net Worth Calculator

  Assets minus liabilities by category, saved on this device only if you choose.

Arithmetic & Algebra

• Basic Calculator

  Arithmetic with keyboard input, exact decimals and clear operator precedence.

• Scientific Calculator

  Trig, logs, powers and roots in degrees or radians with visible precedence.

• Percentage Calculator

  Percent of a number, reverse percentages and percentage change.

• Fraction Calculator

  Exact fraction arithmetic with simplification and mixed numbers.

• Ratio and Proportion Calculator

  Simplify ratios, solve proportions for a missing value and scale ratios.

• Exponent, Root and Logarithm Calculator

  Powers, nth roots and logarithms in any base with domain checks.

• Quadratic Equation Solver

  Real, repeated or complex roots of ax² + bx + c = 0, with the discriminant and vertex.

• System of Linear Equations Solver

  Solve 2×2 and 3×3 systems and detect singular or inconsistent systems.

Geometry

• Triangle Calculator

  Solve a triangle from SSS, SAS, ASA, AAS or SSA, including the ambiguous case.

• Circle Calculator

  Radius, diameter, circumference and area from any one of them.

• Area and Perimeter Calculator

  Rectangle, square, parallelogram, trapezoid and ellipse area and perimeter.

• Volume and Surface Area Calculator

  Cube, cuboid, cylinder, sphere, cone and pyramid volume and surface area.

• Slope, Distance and Midpoint Calculator

  Slope, line equation, distance and midpoint between two points.

Statistics & Probability

• Mean, Median and Mode Calculator

  Mean, median, mode, range and quartiles for a data list, with the quartile method stated.

• Standard Deviation Calculator

  Sample or population variance and standard deviation, step by step.

• Weighted Average Calculator

  Average of values with weights, such as grades or blended rates.

• Permutation and Combination Calculator

  Exact counts of arrangements and selections, with or without repetition.

• Probability Calculator

  And, or, not and conditional probability for independent or dependent events.

• Binomial Distribution Calculator

  Exact and cumulative binomial probabilities with the full distribution table.

• Normal Distribution and Z-Score Calculator

  Normal probabilities, z-scores and percentiles, with accuracy limits stated.

• Age Calculator

  Exact age in years, months and days on any date, with leap-day birthdays handled.

• Days Between Dates Calculator

  Days, weeks, months and years between two dates, with optional inclusive counting.

• Add or Subtract Dates Calculator

  Add or subtract days, weeks, months and years, with end-of-month rules explained.

• Business Days Calculator

  Count or add working days with your own weekend days and holidays.

• Time Duration Calculator

  Add and subtract hours, minutes and seconds, including negative and 24+ hour totals.

• Timesheet Calculator

  Weekly hours with unpaid breaks, overnight shifts and an overtime threshold you set.

• Time Zone Meeting Planner

  Compare a meeting time across IANA time zones, with daylight-saving changes flagged.

• Countdown to a Date

  Live countdown to a date and time in a chosen time zone.

• Length Converter

  Metric and US customary lengths, from millimeters to miles.

• Area Converter

  Square meters, square feet, acres, hectares and more.

• Volume Converter

  Liters, cubic units and cooking measures, keeping US and imperial units separate.

• Weight (Mass) Converter

  Kilograms, pounds, ounces, stones and tons, with short and long tons distinguished.

• Temperature Converter

  Celsius, Fahrenheit and Kelvin readings, and temperature differences.

• Speed Converter

  km/h, mph, m/s, knots and feet per second.

• Pressure Converter

  Pascals, bar, psi, atmospheres, mmHg and inches of mercury.

• Energy and Power Converter

  Joules, calories, kWh and BTU; watts and horsepower — kept as separate quantities.

• Data Storage and Transfer Time Calculator

  Bits and bytes with decimal (MB) and binary (MiB) prefixes, plus download time.

• Fuel Economy and Trip Cost Calculator

  Trip fuel and cost in mpg (US or imperial) or L/100 km.

• Electricity Cost Calculator

  Energy use and cost of an appliance from watts, hours and your tariff.

• Paint Calculator

  Paint for walls after doors and windows, for any number of coats and coverage.

• Flooring and Tile Calculator

  Boxes of flooring or tile with a waste allowance, pack rounding and cost.

• Concrete Calculator

  Concrete for slabs, footings and columns in cubic yards or meters, with bag counts.

• Recipe Scaling Calculator

  Scale ingredient amounts by servings, converting only between compatible units.

• Unit Price Calculator

  Compare price per unit across package sizes and multipacks.

• Adult BMI Calculator

  Body mass index for adults in metric or US units, with what BMI does not measure.

• BMR Calculator

  Estimated basal metabolic rate using the Mifflin–St Jeor equation.

• TDEE Calculator

  Estimated daily energy expenditure from BMR and an activity factor you choose.

• Pace Calculator

  Solve for pace, distance or time in miles or kilometers, with split times.

• Race Time Predictor

  Estimate a finish time from a recent race using Riegel’s formula, with its limits.

• One-Rep Max Calculator

  Estimate a one-repetition maximum with Epley, Brzycki and other named formulas.