Unit Converter
Convert length, weight, area, temperature and volume in one tool, including katha, bigha, decimal (shotok), acre, maund, seer, tola and hat, with a table of all other units.
Most unit converters are built for engineers and cooks. They give you metres, kilograms and gallons, but they do not know what a katha is. If you have ever tried to compare a plot advertised as "5 katha" with a plan drawn in square feet, or tried to find how many kilograms a "10 maund" lot of rice is, you know the problem. This unit converter covers the standard metric and imperial units and adds the traditional units that people in Bangladesh and the wider region still use every day.
How to use the unit converter
- Choose a category: length, weight, area, temperature or volume.
- Type the value. Decimals are fine, for example 2.5.
- Choose the unit you are converting from and the unit you want to.
- Read the main result. Below it, a table shows the same value in every other unit of that category, so you can pick the one you need without changing the menu again.
- Use Swap units to reverse the direction.
The conversion happens as you type. Nothing is sent to a server.
Bangladesh land units: katha, bigha and decimal
Land in Bangladesh is measured in several traditional units. The ones this tool supports are:
- Decimal (shotok): one hundredth of an acre. 1 decimal = 435.6 square feet = about 40.47 square metres.
- Katha: a commonly used standard is 720 square feet. That makes 1 katha about 1.65 decimal, or about 66.9 square metres.
- Bigha: 20 katha. At 720 square feet per katha, 1 bigha is 14,400 square feet, which is about 33.06 decimal.
- Acre: 43,560 square feet, which equals 100 decimal and about 3.025 bigha at the standard katha.
Worked example. A plot is described as 3.5 katha. With a katha of 720 square feet, the area is 2,520 square feet, about 5.79 decimal or 234.1 square metres. If the seller's katha is 800 square feet, change the box to 800 and the same 3.5 katha becomes 2,800 square feet. The difference of 280 square feet is a real size difference, which is why the katha value must be confirmed.
Traditional weights: maund, seer, tola and chhatak
Before the metric system, South Asian trade used a chain of weights that are still heard in markets and in jewellery shops:
- Tola (bhori): about 11.66 grams. Gold is still sold by the bhori in Bangladesh, which is a tola of 11.664 grams.
- Chhatak: one sixteenth of a seer, about 58.3 grams.
- Seer (ser): 80 tola, about 933 grams.
- Maund (mon): 40 seer, about 37.32 kilograms or 82.29 pounds.
- Quintal: 100 kilograms, a metric unit often used for crops.
Bangladesh moved officially to the metric system in the early 1980s, but the older names remain in everyday talk, in farm gate prices and in family records. The converter lets you move from one to the other. As an example, 10 maund of rice is 373.2 kilograms and 0.373 tonnes.
Length: from inch to hat
The length category includes metres, kilometres, centimetres, millimetres, inches, feet, yards, miles and nautical miles. It also has the hat, the traditional cubit of 18 inches, which is exactly 0.4572 metres. One goj equals a yard, or 0.9144 metres, and the tool labels it that way. Builders who work with plans in feet and inches can switch to metres for the structural drawings, while a villager who describes a pond as 40 hat long can see that this is 18.3 metres.
Temperature conversion formulas
Temperature units do not convert by a simple multiplication, because the scales start from different zero points. The tool uses the standard formulas:
- Fahrenheit = Celsius × 9 ÷ 5 + 32. For example, 100 °C = 212 °F, and 37 °C = 98.6 °F.
- Celsius = (Fahrenheit − 32) × 5 ÷ 9. So 95 °F = 35 °C.
- Kelvin = Celsius + 273.15. Absolute zero, 0 K, is −273.15 °C.
Volume
The volume category covers litres, millilitres, cubic metres, cubic centimetres, cubic feet, and US and UK gallons. Note that the US gallon (3.785 litres) is smaller than the UK or imperial gallon (4.546 litres). Fuel economy figures and recipes from different countries often depend on which gallon is meant, so choose carefully.
How the numbers are shown
Results are rounded to about ten significant digits so that rounding noise does not clutter the answer. Very large or very small numbers appear in scientific notation, for example 1.2e-7. The conversion factors come from the internationally accepted definitions: 1 inch = 25.4 mm exactly, 1 foot = 0.3048 m exactly, 1 pound = 0.45359237 kg exactly and 1 acre = 4,046.8564224 square metres. Traditional units use the commonly accepted values given above, and small differences between regions are possible.
Practical uses
Land purchase. Convert the advertised katha or decimal to square feet or square metres and compare it with the area written in a plan or a mutation record. Our Percentage Calculator helps when you need to find the share of a plot that is built up.
Construction and design. Move between feet, inches and metres, or between square feet and square metres, when you read a drawing or order material.
Trade and farming. Compare prices per maund, per kilogram and per quintal to see which offer is cheaper.
Cooking and shopping. Convert pounds, ounces and fluid ounces in recipes from other countries.
Study and travel. Convert Celsius and Fahrenheit, miles and kilometres, and litres and gallons.
Frequently asked questions
How many square feet are in one katha?
A widely used standard is 720 square feet per katha. Local sizes can differ, so the tool lets you change the number in the katha size box and the converted values update immediately.
How many decimals are in one bigha?
With a katha of 720 square feet, one bigha is 20 katha, or 14,400 square feet, which is about 33.06 decimal. If you change the katha size, the bigha result changes with it.
What is the difference between a decimal and a shotok?
They are the same unit. Decimal is the English name and shotok is the Bangla name. One decimal is one hundredth of an acre, or 435.6 square feet.
How many kilograms are in one maund?
One maund of 40 seer is about 37.32 kilograms. A seer is about 933 grams, and it contains 80 tola. Some local markets use rounded values such as 40 kg per maund, so confirm the figure with the seller.
Can I rely on this tool for legal land documents?
No. Use it for estimates and comparisons. For a sale deed, a mutation or a dispute, the measurement of a licensed surveyor and the official records are what count.