Unit converter
Length, area, volume, mass, pressure, energy, power, speed and temperature. Enter once, read every unit in the category.
Convert
| Millimetre | 1,000 |
|---|---|
| Centimetre | 100 |
| Metre | 1 |
| Kilometre | 0.001 |
| Inch | 39.3701 |
| Foot | 3.2808 |
| Yard | 1.0936 |
| Mile | 0.00062137 |
Every factor here is a definition
None of these numbers were measured, so none of them can be revised. The international foot is exactly 0.3048 metres by agreement, the pound exactly 0.45359237 kilograms, the calorie exactly 4.184 joules. That is why a converter is one of the few tools that can be written once and left alone.
Where a unit is defined against other units rather than against an SI base, the factor is stored as the product that defines it. A pound per square inch is a pound-force over a square inch, so it is written as (0.45359237 × 9.80665) ÷ 0.0254², not as a rounded 6894.76. Storing the derivation rather than the rounded result is what stops a chain of conversions drifting.
Two that catch people out
Temperature is not a ratio. Twenty degrees is not twice ten, because the scales have offsets as well as different sizes. It is converted through kelvin here rather than by multiplying.
Horsepower is two different units. Mechanical horsepower is 550 foot-pounds per second, about 745.7 W. Metric horsepower, the PS you see on vehicles sold in Nepal, is 735.5 W. Both are listed because confusing them misreads an engine by nearly 1.5%.
Tola
Included under mass because gold in Nepal is still priced by it. One tola is 11.6638038 grams, which is the old British Indian rupee coin weight, and it is exact rather than approximate.
Common questions
- Is this Engineering unit converter page free to use?
- Yes. Every Kaamko tool is free, with no sign-up, no account and no usage limit. They are published by Imperial College of Engineering, a Tribhuvan University-affiliated engineering college in Tathali, Bhaktapur, and are not funded by advertising.
- Does what I type get sent anywhere?
- No. This tool runs entirely in your browser: the calculation happens on your own device, nothing you type is uploaded, and nothing is stored after you close the page.
- Where do the figures come from?
- Each tool names its source on the page, along with the date that source was read. Where a rate or a slab is provisional — announced in a budget speech but not yet gazetted, for instance — the page says so rather than presenting it as settled.
- Who maintains these tools?
- Imperial College of Engineering, formerly Janakpur Engineering College, in Tathali, Bhaktapur, Nepal. Corrections are welcome by phone on 01-5091616 or through the contact page, and a figure reported as wrong is checked against its published source rather than adjusted on request.
Last checked by Imperial College of Engineering. Rates, slabs and formulas are re-checked against their published source on this date.