Convert a measurement
Metric and US units, converted as you type.
Result
100 centimeters = 39.3701 inches
Runs in your browser. Your entries are calculated on this device. Ziannah does not store the values you enter here.
Related tools
Explore all toolsHow it works
Convert between metric and US units
Every conversion here uses the exact internationally agreed factors: an inch is defined as exactly 25.4 millimeters and a pound as exactly 453.59237 grams, so results are precise rather than approximate.
The conversions people reach for most
One inch is 2.54 cm, one foot is 30.48 cm, one mile is about 1.61 km. One kilogram is about 2.2 pounds, and one stone is exactly 14 pounds. Memorizing these five covers most everyday estimates.
Temperature is different
Length and weight scale by multiplication, but temperature scales have different zero points, so the formula has two steps: °F = °C × 9/5 + 32. That is why 0°C is 32°F, not 0°F.
Quick mental math for temperature
Double the Celsius value and add 30 for a fast Fahrenheit estimate. It is exact at 10°C (50°F) and stays within a few degrees across normal weather temperatures.
Rounding
Results are rounded to six decimal places for display. If you are cutting materials or dosing anything by weight, keep the full precision until the final figure and round once at the end.
Related reading
Read the blog
Article
Is overtime taxed more? No, and here is the real reason
Overtime is taxed at the same rate as your normal pay. Here is why your payslip looks wrong, and the new deduction that cuts what you owe from 2025 to 2028.
Article
How to Calculate Overtime Pay (Time and a Half)
Multiply your regular rate by 1.5 and then by your overtime hours. The hard part is knowing which rate to use, because it is often higher than your wage.
Article
Minutes to Decimal Hours: Payroll Conversion Chart
Divide minutes by 60. Here is the chart, the four values worth memorizing, and the rounding habit that quietly costs you minutes every week.