Finance, health, date and everyday calculators — with the formula shown, not hidden.
A calculator that returns a number and nothing else is only half useful. If you are working out a loan repayment, the figure matters, but so does knowing which formula produced it and what happens when one input moves — because the actual question is almost never 'what is the payment' and almost always 'can I afford this, and what changes if the rate goes up'.
The financial calculators here use standard amortisation maths: the EMI and loan tools apply the reducing-balance formula that banks use, where each payment covers the interest accrued that period first and the remainder reduces principal. That is why total interest paid falls sharply when you shorten a term but only modestly when you overpay occasionally, and the schedules these tools produce show that rather than asserting it.
A word on the health calculators. BMI is a population-level statistic being applied to one person, which is a known limitation rather than a controversial opinion — it uses height and weight alone, so it cannot distinguish muscle from fat and systematically misclassifies both athletes and the elderly. It is a useful rough screen and nothing more. Anything that would change a medical decision belongs with a clinician, not a web page.
Calculate exact age in years, months & days.
CalculatorsSolve any percentage problem instantly.
Calculators PopularCalculate your Body Mass Index & category.
CalculatorsCalculate loan payments and total interest.
CalculatorsCompute monthly EMI for any loan.
CalculatorsFind sale price and amount saved.
CalculatorsAdd/subtract days & find difference between dates.
CalculatorsAdd or remove GST from any amount.
CalculatorsCalculate your basal metabolic rate.
CalculatorsCalculate grade point average.
CalculatorsAdd and subtract time durations.
CalculatorsConvert salary between hourly, monthly & yearly.
CalculatorsEstimate fuel cost & consumption for a trip.
CalculatorsEstimate monthly mortgage payments.
CalculatorsAdd or remove VAT from a price.
Calculators NewProject the future value of monthly SIP investments.
Calculators NewCalculate compound interest for any principal, rate and compounding frequency.
Calculators NewCalculate simple interest and total repayment amount.
Calculators NewCalculate return on investment percentage and gain or loss.
Calculators NewFind the units and revenue needed to break even.
Calculators NewCalculate profit margin and markup percentage.
Calculators NewSee what today's amount will cost in the future.
Calculators NewEstimate progressive income tax using your own bracket thresholds.
Calculators NewFind the monthly savings needed to reach a goal.
Calculators NewFind months to pay off a balance and total interest paid.
Calculators NewCalculate daily calorie needs for maintaining, losing or gaining weight.
Calculators NewEstimate body fat percentage using the U.S. Navy tape-measurement method.
Calculators NewCalculate your recommended daily water intake.
Calculators NewEstimate due date and current week using Naegele's rule.
Calculators NewCalculate max heart rate and 5 training zones by age.
Calculators NewCalculate protein, carb and fat gram targets from calories.
Calculators NewCalculate CGPA on a 10-point scale from subject grade points and credits.
Calculators NewCalculate weighted final grade and letter grade from assessments.
Calculators NewCalculate mean, median, mode, sum, min and max of any numbers.
Calculators NewCalculate percentage and grade from marks obtained out of total.
Calculators NewAdd, subtract, multiply or divide two fractions.
Calculators NewSolve ax²+bx+c=0 for real or complex roots.
Calculators NewCalculate mean, variance and standard deviation.
Calculators NewCount business days between two dates, excluding holidays.
Calculators NewSee a date/time converted across 12 major world time zones.
Calculators NewConvert between meters, kilometers, miles, feet and more.
Calculators NewConvert between kilograms, pounds, ounces and stone.
Calculators NewConvert between Celsius, Fahrenheit and Kelvin.
Calculators NewConvert between km/h, mph, m/s, knots and ft/s.
Calculators NewConvert between bits, bytes, KB, MB, GB, TB and PB.
Calculators NewCalculate concrete volume and bags needed for a slab or footing.
Calculators NewCalculate how many gallons of paint you need.
Calculators NewCalculate how many tiles you need for a room.
Calculators NewCalculate roof area and shingle squares needed by pitch.
Calculators NewCalculate probability of independent events.
Calculators NewCalculate nCr combinations and nPr permutations.
Calculators NewCalculate a z-score and percentile from value, mean and SD.
Calculators NewSolve for voltage, current, resistance or power.
Calculators NewCalculate range, height and time of flight of a projectile.
Calculators NewSolve for force, mass or acceleration.
Calculators NewCalculate molar concentration from mass, molar mass and volume.
Calculators NewCalculate molar mass from any chemical formula.
Calculators NewCalculate pH, pOH and ion concentration.
Calculators NewSolve C1V1=C2V2 for any dilution quantity.
Calculators NewSolve PV=nRT for pressure, volume, moles or temperature.
Calculators NewDecode a 4-band resistor color code.
Calculators NewCalculate total resistance in series or parallel.
Calculators NewCalculate output voltage of a resistor voltage divider.
Calculators NewCalculate torque from force, distance and angle.
Calculators NewCalculate mechanical stress from force and area.
Calculators NewConvert between binary, octal, decimal and hexadecimal.
Calculators NewCalculate simplified aspect ratio and scale dimensions.
Calculators NewConvert between px, em, rem and pt.
Calculators NewCalculate file transfer time from size and connection speed.
Calculators NewCalculate password entropy and strength rating.
Calculators NewCalculate tip amount and per-person bill split.
Calculators NewAdd or remove sales tax from a price.
Calculators NewCalculate monthly car payment with trade-in and tax.
Calculators NewScale recipe ingredients to a new serving size.
Calculators NewCalculate running pace per mile/km and speed.
Calculators NewConvert between square meters, acres, hectares and more.
Calculators NewConvert between liters, cubic meters, cubic feet and gallons.
Calculators NewConvert between joules, calories, kWh and BTU.
Calculators NewConvert between cups, tablespoons, teaspoons and mL.
Calculators NewCalculate max home price from income and DTI ratio.
Calculators NewCalculate net worth from assets and liabilities.
Calculators NewCalculate calories burned from activity, weight and duration.
Calculators NewCalculate WHR and body fat distribution risk category.
Calculators NewCalculate APY from nominal rate and compounding frequency.
Calculators NewEstimate investment doubling time from return rate.
Calculators NewCalculate area, circumference and diameter from radius.
Calculators NewCalculate triangle area from 3 sides using Heron's formula.
Calculators NewSolve for hypotenuse or leg of a right triangle.
Calculators NewCalculate distance between two coordinate points.
Calculators NewCalculate slope and line equation from two points.
Calculators NewFind the prime factorization of any whole number.
Calculators NewCalculate logarithms and exponents in any base.
Calculators NewCalculate a confidence interval for a sample mean.
Calculators NewCalculate survey sample size needed.
Calculators NewEstimate ideal weight using the Devine formula.
CalculatorsProject the future value of monthly SIP investments.
Calculators NewCalculate compound interest for any principal, rate and compounding frequency.
Calculators NewCalculate simple interest and total repayment amount.
Calculators NewCalculate return on investment percentage and gain or loss.
Calculators NewFind the units and revenue needed to break even.
Calculators NewCalculate profit margin and markup percentage.
Calculators NewSee what today's amount will cost in the future.
Calculators NewEstimate progressive income tax using your own bracket thresholds.
Calculators NewFind the monthly savings needed to reach a goal.
Calculators NewFind months to pay off a balance and total interest paid.
Calculators NewCalculate daily calorie needs for maintaining, losing or gaining weight.
Calculators NewEstimate body fat percentage using the U.S. Navy tape-measurement method.
Calculators NewCalculate your recommended daily water intake.
Calculators NewEstimate due date and current week using Naegele's rule.
Calculators NewCalculate max heart rate and 5 training zones by age.
Calculators NewCalculate protein, carb and fat gram targets from calories.
Calculators NewCalculate CGPA on a 10-point scale from subject grade points and credits.
Calculators NewCalculate weighted final grade and letter grade from assessments.
Calculators NewCalculate mean, median, mode, sum, min and max of any numbers.
Calculators NewCalculate percentage and grade from marks obtained out of total.
Calculators NewAdd, subtract, multiply or divide two fractions.
Calculators NewSolve ax²+bx+c=0 for real or complex roots.
Calculators NewCalculate mean, variance and standard deviation.
Calculators NewCount business days between two dates, excluding holidays.
Calculators NewSee a date/time converted across 12 major world time zones.
Calculators NewConvert between meters, kilometers, miles, feet and more.
Calculators NewConvert between kilograms, pounds, ounces and stone.
Calculators NewConvert between Celsius, Fahrenheit and Kelvin.
Calculators NewConvert between km/h, mph, m/s, knots and ft/s.
Calculators NewConvert between bits, bytes, KB, MB, GB, TB and PB.
Calculators NewCalculate concrete volume and bags needed for a slab or footing.
Calculators NewCalculate how many gallons of paint you need.
Calculators NewCalculate how many tiles you need for a room.
Calculators NewCalculate roof area and shingle squares needed by pitch.
Calculators NewCalculate probability of independent events.
Calculators NewCalculate nCr combinations and nPr permutations.
Calculators NewCalculate a z-score and percentile from value, mean and SD.
Calculators NewSolve for voltage, current, resistance or power.
Calculators NewCalculate range, height and time of flight of a projectile.
Calculators NewSolve for force, mass or acceleration.
Calculators NewCalculate molar concentration from mass, molar mass and volume.
Calculators NewCalculate molar mass from any chemical formula.
Calculators NewCalculate pH, pOH and ion concentration.
Calculators NewSolve C1V1=C2V2 for any dilution quantity.
Calculators NewSolve PV=nRT for pressure, volume, moles or temperature.
Calculators NewDecode a 4-band resistor color code.
Calculators NewCalculate total resistance in series or parallel.
Calculators NewCalculate output voltage of a resistor voltage divider.
Calculators NewCalculate torque from force, distance and angle.
Calculators NewCalculate mechanical stress from force and area.
Calculators NewConvert between binary, octal, decimal and hexadecimal.
Calculators NewCalculate simplified aspect ratio and scale dimensions.
Calculators NewConvert between px, em, rem and pt.
Calculators NewCalculate file transfer time from size and connection speed.
Calculators NewCalculate password entropy and strength rating.
Calculators NewCalculate tip amount and per-person bill split.
Calculators NewAdd or remove sales tax from a price.
Calculators NewCalculate monthly car payment with trade-in and tax.
Calculators NewScale recipe ingredients to a new serving size.
Calculators NewCalculate running pace per mile/km and speed.
Calculators NewConvert between square meters, acres, hectares and more.
Calculators NewConvert between liters, cubic meters, cubic feet and gallons.
Calculators NewConvert between joules, calories, kWh and BTU.
Calculators NewConvert between cups, tablespoons, teaspoons and mL.
Calculators NewCalculate max home price from income and DTI ratio.
Calculators NewCalculate net worth from assets and liabilities.
Calculators NewCalculate calories burned from activity, weight and duration.
Calculators NewCalculate WHR and body fat distribution risk category.
Calculators NewCalculate APY from nominal rate and compounding frequency.
Calculators NewEstimate investment doubling time from return rate.
Calculators NewCalculate area, circumference and diameter from radius.
Calculators NewCalculate triangle area from 3 sides using Heron's formula.
Calculators NewSolve for hypotenuse or leg of a right triangle.
Calculators NewCalculate distance between two coordinate points.
Calculators NewCalculate slope and line equation from two points.
Calculators NewFind the prime factorization of any whole number.
Calculators NewCalculate logarithms and exponents in any base.
Calculators NewCalculate a confidence interval for a sample mean.
Calculators NewCalculate survey sample size needed.
Calculators NewEstimate ideal weight using the Devine formula.
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