Calculate exact age from date of birth in years, months, days, total days lived, day of birth, and next birthday countdown.

Create a live countdown to any future date or measure time since a past event in days, hours, minutes, and seconds.

Calculate days, weeks, months, years, business days, weekend days, and total hours between two dates.

Calculate percentages, percentage increase or decrease, percentage difference, discounts, markups, and X percent of any number.

Calculate sale price, discount amount, savings percentage, and final price for shopping, invoices, pricing, and promotions.

Estimate fuel needed and trip cost using distance, mileage, fuel efficiency, local fuel price, round trips, and passenger sharing.

Calculate monthly loan EMI, total interest, total payment, amortization, and savings from optional extra monthly payments.

Calculate how long it may take to pay off credit card debt, total interest, total paid, and savings from extra monthly payments.

Calculate your debt-to-income ratio from gross monthly income, rent or mortgage, credit cards, loans, and other monthly debt payments.

Calculate how much to save each month to reach a savings goal, estimate time to goal, progress, and projected balance.

Estimate projected retirement savings, inflation-adjusted target, savings gap, and required monthly contribution.

Calculate inflation-adjusted value, future buying power, cumulative inflation, and price change over time.

Calculate a car loan EMI with flat or reducing interest, synced down payment, trade-in, fees, balloon payment, affordability, and amortization.

Compare leasing versus buying a car with financing, equity, resale, mileage, insurance, maintenance, fees, and break-even analysis.

Calculate a home down payment, loan amount, monthly mortgage, PMI, closing costs, affordability, and 10%, 20%, or 30% down payment comparisons.

Calculate loan payments and generate a full amortization schedule with principal, interest, remaining balance, extra payments, and CSV export.

Compare renting and buying a home with mortgage, rent growth, taxes, insurance, maintenance, equity, and investment assumptions.

Calculate return on investment, net gain or loss, total investment, annualized ROI, and return multiple online.

Calculate personal net worth with detailed asset fields, liability fields, custom entries, and debt ratio insights.

Calculate break-even units, break-even revenue, contribution margin, and the sales volume needed to cover business costs.

Calculate gross profit, operating profit, net profit, margins, markup, tax, and return on cost from business revenue and expenses.

Estimate your pregnancy due date, current week, approximate month, trimester, and milestones using LMP, conception, or ultrasound dating.

Estimate income tax, taxable income, average tax rate, annual take-home pay, and monthly take-home income.

Calculate sales tax, before-tax price, tax amount, and final price online with add and remove tax modes.

Add VAT to a net price or remove included VAT from a gross price with a custom rate and clear net, VAT, and gross totals.

Estimate 2025 or 2026 federal withholding, FICA, state and local tax, deductions, take-home pay, and employer payroll cost.

Estimate metabolic age, BMR, BMI, daily energy needs, and waist-to-height context from age, gender, height, weight, and activity level.

Calculate daily calorie needs for weight loss, maintenance, or weight gain with BMR, TDEE, BMI, and macro estimates.

Estimate ideal body weight with the Devine formula, calculate adjusted body weight, and compare BMI-based reference values in kg or pounds.

Estimate a daily beverage-fluid goal from weight, activity, climate, sex, and pregnancy or breastfeeding context, then track glasses locally.

Estimate five heart rate training zones and your Zone 2 BPM range using age-based or Karvonen heart-rate reserve methods.

Estimate BMI-based pregnancy weight gain ranges for one baby or twins and track weekly progress privately in your browser.

Estimate your next period, ovulation date, fertile window, PMS timing, and cycle pattern with a private browser-based menstrual cycle tracker.

Estimate blood alcohol concentration, elimination time, and US BAC reference levels from weight, drink size, ABV, quantity, and drinking time.

Calculate risk-based forex and gold lot size, pip value, margin, risk amount, take-profit targets, and combined position exposure.

Calculate markup, gross margin, profit, reverse selling price, tax-inclusive pricing, pricing tiers, and batch product results.

Calculate stock profit or loss after commissions, taxes, charges, multiple purchase lots, break-even price, targets, and portfolio positions.