Free Online Calculators

Add 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.

Just 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.

Pick 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.

Enter 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.

Estimate 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.

Estimate 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.

Estimate your basal metabolic rate (BMR) — the energy your body needs at rest — from your sex, age, height, and weight using the Harris-Benedict equation.

Estimate your total daily energy expenditure (TDEE) from your sex, age, height, weight, and activity level. Also shows target calories for cutting, maintaining, and bulking.

Enter your height and weight to instantly calculate your BMI, ideal weight (BMI 22), and weight category based on WHO/JASSO standards.

Enter 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.

Enter 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.

Just 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).

Just 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.

Convert 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.

Enter 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.

Convert 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.

Convert weight and mass between grams, kilograms, tonnes, pounds, ounces, and more. Enter a value, pick its unit, and see a full conversion table instantly.

Convert 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.

Quickly 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.

Estimate 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.

Estimate 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.

Estimate 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.

Estimate the electricity cost and CO2 emissions of running your AC in heating mode, broken down per hour, day, and month.

Estimate 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.

Pick 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.

Add 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.

Add or subtract weeks from any date to find the date X weeks later or earlier. Shows the weekday instantly.

Add 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.

Turn a start date into a table of dates and weekdays repeating every N days. Great for medication, recurring tasks, and maintenance cycles.

Instantly 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.

Calculate the ideal shooting distance to your subject from a flash unit's guide number, aperture and ISO.

Calculate 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.

Estimate the lens focal length (mm) and 35mm equivalent you need from your subject distance, real size, and sensor width.

Enter 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.

From focal length, f-stop, subject distance, and circle of confusion, calculate the front, rear, and total in-focus range plus the hyperfocal distance.

From 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.

Type 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.

Plot two expressions f(x) and g(x) on the same axes in distinct colors, and automatically find their max, min, and intersection points.

Just 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.

Paste 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.

Solve 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.

A 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.