Free Online Calculators
Calculators for everyday life and work — BMI, age, dates, loans, compound interest, tips, unit conversion and more. Just type in your numbers for instant answers. No install, no signup, works great on mobile.
Money
77 toolsSales Tax & VAT Calculator
MoneyAdd or remove sales tax / VAT from any price. Enter an amount and rate to instantly see the net price, tax amount, and gross total, with your choice of rounding.
Open calculator →Loan Payment Calculator
MoneyJust enter the loan amount, annual interest rate and term to instantly calculate your monthly payment, total repayment and total interest. Supports equal-payment and equal-principal methods, with a modern chart of the principal-vs-interest breakdown.
Open calculator →Lottery Winning Odds Calculator
MoneyPick a lottery type (Loto 6, Loto 7, Mini Loto, or Jumbo) and the number of tickets to calculate your odds of hitting the jackpot, your chance of winning any prize, and the expected payout rate. Compare the odds against everyday events to feel just how unlikely a win really is.
Open calculator →Loan Repayment Calculator with Bonus Payments
MoneyEnter your loan amount, interest rate and term, plus the share repaid through bonus payments and how often they occur, to instantly compute your monthly payment, each bonus payment, the annual and total repayment, and total interest using the equal-payment method. A year-by-year amortization schedule is included.
Open calculator →Loan Prepayment Calculator (Term Reduction / Payment Reduction)
MoneyEstimate the impact of prepaying a mortgage or other loan. Enter your loan terms plus when and how much you prepay to see the interest you save, the loan term you can shorten with term reduction, or the new monthly payment with payment reduction.
Open calculator →Loan Prepayment Calculator (with Bonus Payments)
MoneyEstimate how much you save by prepaying a mortgage that uses bonus payments. The monthly and bonus portions are handled separately so you can compare the term-shortening and payment-reduction methods, including interest saved, time cut, and the new payment.
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Health
89 toolsBasal Metabolic Rate (BMR) Calculator
HealthEstimate your basal metabolic rate (BMR) — the energy your body needs at rest — from your sex, age, height, and weight using the Harris-Benedict equation.
Open calculator →TDEE Calculator (Total Daily Energy Expenditure)
HealthEstimate your total daily energy expenditure (TDEE) from your sex, age, height, weight, and activity level. Also shows target calories for cutting, maintaining, and bulking.
Open calculator →BMI Calculator
HealthEnter your height and weight to instantly calculate your BMI, ideal weight (BMI 22), and weight category based on WHO/JASSO standards.
Open calculator →BMI & Ideal Weight (Weight Change Chart)
HealthEnter your height, current and target weight, and pace to see how many months it will take and how your BMI changes, shown in a chart and table.
Open calculator →BMI to Weight Calculator (Conversion Chart)
HealthEnter your height to see the weight for each BMI from 16 to 35 in a table and conversion chart. Ideal, beauty, and model weights are shown together.
Open calculator →Ideal Weight (BMI 22) Calculator
HealthJust enter your height to instantly calculate your ideal weight (BMI 22). It also shows your beauty weight (BMI 20), underweight threshold (BMI 18.5), and overweight threshold (BMI 25).
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Units
42 toolsLength Converter
UnitsJust enter a value and pick a unit to instantly convert between meters, centimeters, inches, feet, shaku, nautical miles, light-years and more. A single table shows the value in every other unit at once.
Open calculator →Area Converter
UnitsConvert between m², acres, hectares, square feet, and Japanese units like tsubo and jo. Enter a value, pick a unit, and see every conversion at once.
Open calculator →Volume & Capacity Converter
UnitsEnter a value and pick a unit to convert at once between mL, L, m³, cubic inches, cubic feet, US/UK gallons, pints and quarts, plus the Japanese go, sho, to and koku.
Open calculator →Flow Rate Converter
UnitsConvert between 8 flow rate units such as L/min, m³/h, US gal/min, and ft³/s. Enter a value, pick a unit, and see every conversion at once.
Open calculator →Weight (Mass) Converter
UnitsConvert weight and mass between grams, kilograms, tonnes, pounds, ounces, and more. Enter a value, pick its unit, and see a full conversion table instantly.
Open calculator →Force Converter
UnitsConvert between force units such as newtons (N), kilonewtons (kN), kilogram-force (kgf), dynes, and pound-force (lbf). Just enter a value and pick a unit to see all conversions at once.
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Environment
30 toolsIncandescent to LED Savings
EnvironmentQuickly estimate how much you can save on yearly electricity and CO2 by replacing incandescent bulbs with LED or fluorescent lamps, based on wattage, hours of use, and the number of bulbs.
Open calculator →Car-to-Bicycle Commute Savings
EnvironmentEstimate how much fuel money and CO2 you can save each year, and how many calories you'll burn, by replacing your car commute with a bicycle.
Open calculator →Appliance Replacement Savings
EnvironmentEstimate the annual electricity savings, CO2 reduction, and payback period when you replace an old appliance with an energy-efficient model, straight from the power consumption.
Open calculator →Air Conditioner (Cooling) Electricity Cost & CO2
EnvironmentEstimate the electricity cost and CO2 emissions of running an AC in cooling mode from its power draw (W), hours, and days. You can also pick by room size.
Open calculator →Air Conditioner Heating Cost & CO2
EnvironmentEstimate the electricity cost and CO2 emissions of running your AC in heating mode, broken down per hour, day, and month.
Open calculator →Kerosene Fan Heater Fuel Cost & CO2
EnvironmentEstimate the fuel cost and CO2 emissions of a kerosene fan heater from its kerosene use. Enter hourly consumption, hours per day, number of days, and the kerosene price to see the cost and CO2 for the period.
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Calendar
15 toolsDays Between Dates Calculator
CalendarPick a start date and an end date to instantly find the number of days between them. Toggle whether both endpoints are counted, and see week, month, and year approximations at the same time.
Open calculator →Date Plus Days Calculator
CalendarAdd or subtract days from a base date to find the date a given number of days before or after, complete with the day of the week. Includes a weeks breakdown, great for deadlines, anniversaries, and expiry dates.
Open calculator →Add or Subtract Weeks from a Date
CalendarAdd or subtract weeks from any date to find the date X weeks later or earlier. Shows the weekday instantly.
Open calculator →Add or Subtract Years & Months from a Date
CalendarAdd or subtract years and months from any date and get the result with the weekday, Japanese era, and number of days elapsed. Handles month-end adjustment automatically.
Open calculator →Recurring Date Schedule (Every N Days)
CalendarTurn a start date into a table of dates and weekdays repeating every N days. Great for medication, recurring tasks, and maintenance cycles.
Open calculator →How Many Days Until? Countdown Calculator
CalendarInstantly count how many days are left until your target date. Get the days, weeks, months, and weekday remaining to an exam, birthday, anniversary, or deadline. For past dates, see how many days have elapsed.
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Hobby
93 toolsFlash Shooting Distance
HobbyCalculate the ideal shooting distance to your subject from a flash unit's guide number, aperture and ISO.
Open calculator →Flash Aperture Calculator
HobbyCalculate the correct f-stop for flash photography from guide number, distance, and ISO. Instantly see the nearest standard f-stop and the correct distance for each aperture.
Open calculator →Lens Focal Length Calculator
HobbyEstimate the lens focal length (mm) and 35mm equivalent you need from your subject distance, real size, and sensor width.
Open calculator →Camera Angle of View Calculator
HobbyEnter a lens focal length and image sensor size to instantly calculate how wide a scene the camera captures: the horizontal, vertical, and diagonal angle of view. Includes presets for full frame, APS-C, Micro Four Thirds and more (plus custom sensor sizes) and shows the 35mm equivalent focal length too.
Open calculator →Depth of Field Calculator
HobbyFrom focal length, f-stop, subject distance, and circle of confusion, calculate the front, rear, and total in-focus range plus the hyperfocal distance.
Open calculator →Camera Field of View Calculator
HobbyFrom focal length, shooting distance, and sensor size, calculate the real area captured in your photo (width x height) and the angle of view. Great for planning group and product shots.
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Numerical
20 toolsFunction Graph Plotter f(x)
NumericalType an expression such as sin(x) or x^2-2 and instantly plot its graph over a chosen x range. Maximum, minimum, zeros, and sample point values are shown alongside.
Open calculator →Graph Two Functions f(x) and g(x)
NumericalPlot two expressions f(x) and g(x) on the same axes in distinct colors, and automatically find their max, min, and intersection points.
Open calculator →Data Point f(x) Graph Plotter
NumericalJust paste your (x, y) data points to instantly draw a line-and-point chart. See the point count plus the minimum, maximum, and average of y at the same time.
Open calculator →Plot Data Points f(x), g(x)
NumericalPaste two sets of (x, y) data points and get f(x) and g(x) drawn as color-coded overlaid line graphs, with each series' point count and min/max.
Open calculator →Bisection Method Equation Solver
NumericalSolve f(x)=0 with the bisection method. Enter a function and an interval to get the approximate root, f(root), the iteration count, and the error, plus a per-step table of intervals and midpoints and a function graph.
Open calculator →False Position Method (Regula Falsi) Solver
NumericalA numerical tool that solves your equation f(x)=0 with the false position method (linear interpolation, regula falsi). Enter an interval and a tolerance to get the approximate root, f(root), the iteration count, and a table and chart of the iteration process.
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