Calculate what is X% of Y, what percentage a number is of another, and percentage shifts.
Open Calculator →MATH.CHANGECalculate percentage increase, decrease, or difference between two values.
Open Calculator →MATH.DISCOUNTCalculate sale price, total savings, and final price including sales tax.
Open Calculator →MATH.FRACAdd, subtract, multiply, and divide fractions with auto-simplification and decimal conversion.
Open Calculator →MATH.RATIOSimplify ratios, find equivalent ratios, and divide amounts into proportional parts.
Open Calculator →MATH.PROPSolve direct and inverse proportion equations and rule of three (A/B = C/X).
Open Calculator →MATH.AVGCalculate mean average, median, mode, range, standard deviation, and variance.
Open Calculator →MATH.GRADECalculate weighted final grade and required score on final exam to reach target grade.
Open Calculator →FIN.LOANMonthly payment, total interest, total loan cost, and full amortization schedule.
Open Calculator →FIN.MORTGAGEHome mortgage payment calculator with property taxes, insurance, PMI, and country presets.
Open Calculator →FIN.SIMPLE_INTCalculate simple interest (I = P·r·t), final balance, interest rate, or time period.
Open Calculator →FIN.COMPOUNDSimulate investment growth with periodic contributions, compounding frequencies, and year schedule.
Open Calculator →FIN.SALARYConvert gross salary to net take-home pay with taxes and country presets.
Open Calculator →FIN.OVERTIMECalculate overtime pay at 1.5x (time-and-a-half), 2.0x (double time), and holiday rates.
Open Calculator →FIN.MARGINCalculate gross profit margin, net profit margin, COGS, and revenue ratios.
Open Calculator →FIN.MARKUPSet optimal selling price from unit cost and target markup percentage.
Open Calculator →FIN.ROICalculate net ROI percentage and annualized ROI for investments and marketing campaigns.
Open Calculator →FIN.TIPCalculate tip percentage (10%, 15%, 20%...) and split restaurant bill evenly among diners.
Open Calculator →FIN.VATAdd or extract VAT / Sales Tax with presets for Spain, Mexico, Colombia, Argentina, UK, etc.
Open Calculator →FIN.INFLATIONCalculate future purchasing power of money and cumulative loss from inflation rates.
Open Calculator →TIME.AGECalculate exact age in years, months, days, minutes, seconds, and next birthday countdown.
Open Calculator →TIME.DIFFCount total days, working business days (Mon-Fri), weeks, and months between two dates.
Open Calculator →TIME.MATHAdd or subtract days, weeks, months, or years to/from any start date to find future/past dates.
Open Calculator →TIME.HOURSCalculate total hours worked between clock-in and clock-out with unpaid break deductions.
Open Calculator →HEALTH.BMICalculate Body Mass Index (BMI) with metric/imperial units, WHO categories, and ideal weight range.
Open Calculator →HEALTH.CALORIESCalculate Total Daily Energy Expenditure (TDEE) and BMR calories for fat loss, maintenance, or muscle gain.
Open Calculator →HEALTH.PACECalculate pace per km or mile, finish time, and speed for 5K, 10K, Half Marathon, and Marathon.
Open Calculator →UTIL.UNITPRICECompare items of different weights, volumes, or pack sizes to find the best grocery bargain.
Open Calculator →UTIL.FUELCalculate gas trip expense, total liters/gallons consumed, and split costs among passengers.
Open Calculator →Compound interest represents the primary mathematical engine of long-term wealth accumulation. Governed by the formula A = P * (1 + r/n)^(n*t), total accumulated capital (A) is determined by initial principal (P), nominal interest rate (r), compounding frequency per year (n), and time horizon in years (t). Reinvesting accrued yields each cycle shifts financial growth from a linear trajectory into an exponential curve that outpaces purchasing power erosion from inflation.
Debt repayment structures follow rigorous amortization models. The French Amortization System (fixed installment) is the global banking standard: monthly payments remain identical across the term, but internal distribution shifts from heavy interest servicing initially to accelerated principal paydown toward maturity. Conversely, the German System features constant principal amortization, yielding progressively declining monthly payment amounts over the life of the loan.
Extracting net pricing from gross sales figures requires inverse percentage mathematics. To compute net base price from a tax-inclusive total, the required equation is Base = Total / (1 + Rate), avoiding the common accounting fallacy of subtracting the tax percentage directly from the gross total. Our financial tools provide presets reflecting active statutory tax brackets across the US, UK, Canada, EU, Mexico, and Latin America.
Nutritional planning and metabolic health calculations rely on clinically validated physiological equations. While Body Mass Index (BMI = weight / height^2) offers a population-level screening metric per World Health Organization guidelines, individual caloric targets require Basal Metabolic Rate (BMR) modeling via the Mifflin-St Jeor or Revised Harris-Benedict equations, factored by physical activity coefficients to determine Total Daily Energy Expenditure (TDEE).