Calculator World

Project 401(k) growth with employee contributions, employer match, and an expected return rate.

Estimate your car payment, total interest, and payoff date with optional trade-in, fees, and sales tax.

Estimate blood alcohol content (BAC) based on drinks, weight, and time. For informational purposes only.

Calculate your body mass index (BMI) from height and weight and see the standard adult BMI category.

Estimate daily calorie needs (maintenance, cut, or bulk) using a standard BMR + activity model.

Estimate CD interest earned and ending balance at maturity with common compounding options.

See how money grows with compound interest and contributions over time, with a year-by-year breakdown.

Estimate concrete volume for common shapes (slabs, walls, footings, columns) with optional bag and cost estimates.

Calculate CPM, impressions, or total cost by filling in any two fields.

Estimate payoff time and total interest based on your balance, APR, and monthly payment (or target payoff date).

Add or subtract time from a date, or calculate the difference between two dates.

Estimate pregnancy due date based on last menstrual period (LMP) or conception date.

Calculate your GPA from course grades and credit hours using a standard 4.0 scale.

Calculate your current grade from weighted categories and see what you need on remaining work to reach a target.

Estimate a HELOC borrowing limit based on home value and LTV, plus simple payment scenarios.

Estimate how much you can borrow against home equity and calculate a fixed monthly payment.

Calculate hours and minutes between times, including optional breaks and decimal-hour output.

Convert dollar amounts between years using CPI-based inflation estimates.

Calculate simple interest earned or owed over time and the total amount.

Estimate future investment value with recurring contributions and expected return assumptions.

Calculate monthly loan payments and view a full amortization schedule.

Estimate your monthly mortgage payment with a detailed cost breakdown and amortization schedule.

Estimate ovulation and your fertile window using your last period date and average cycle length.

Solve common percent problems: percent of a number, percent change, and what percent one number is of another.

Estimate gestational age, due date, trimester, and key dates from your last menstrual period.

Calculate profit, margin, revenue, or cost. Enter any two fields to solve the rest.

Create a QR code for a URL or text and download it as an image.

Generate random integers or decimals in a range with options for quantity, duplicates, and sorting.

Project retirement savings growth and estimate if you’re on track based on your contribution and return assumptions.

Project Roth IRA growth over time based on contributions and an expected return rate.

Calculate sales tax and total price from a purchase amount and tax rate.

Project savings growth from a starting balance, contributions, and an interest rate over time.

Estimate payments, total interest, and payoff date for one or more student loans.

Add up weekly hours from clock-in/clock-out times with breaks and optional overtime/pay estimates.

Convert time (hh:mm:ss) to decimal hours (and back) with rounding options for timesheets.

Calculate tip amount, total bill, and per-person totals with an optional split.

Build a tagged URL with UTM parameters for campaign tracking (source, medium, campaign, term, content).