Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsUse a base converter for binary, decimal and hexadecimal numerals, and a separate unit converter for quantities such as bytes and bits. Before trusting either result, confirm the input and output units, check the conversion factor and rounding, and keep decimal SI prefixes separate from binary prefixes: 1 kB is 1,000 bytes, while 1 KiB is 1,024 bytes.
What a binary converter actually converts
A base converter changes how a number is written; it does not change the number’s value. Binary is base 2, so its digits are 0 and 1, and each position represents a power of two. Decimal is base 10, while hexadecimal is base 16.
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Example: binary to decimal
For 1010₂, the place values from right to left are 1, 2, 4 and 8. The digits select the 8 and 2 positions, so 1010₂ = 8 + 2 = 10₁₀.
Example: binary to hexadecimal
Group binary digits into four-bit nibbles from the right. The binary value 1010 is one nibble and corresponds to hexadecimal A. For longer values, pad the leftmost group with leading zeros if needed; padding changes the written form, not the value.
Choose the right kind of converter
First identify whether you are changing a numeral’s base or converting a measured quantity. A base converter should let you select or identify the input and output bases. A unit converter should make the units and conversion factor clear.
- For base conversion: check supported bases, input validation, treatment of leading zeros and signed values, visibility of intermediate work, and precision or rounding controls.
- For data quantities: confirm that the tool distinguishes bits from bytes and labels decimal and binary prefixes explicitly.
- For sensitive input: check whether the tool explains where processing occurs and whether it works offline. A page may claim browser-based processing, but that claim is not proof of its privacy behavior.
For routine checks, an online converter can be convenient. One indexed converter page describes multiple conversion modes and browser-based text conversion, but those feature statements are vendor claims, not independently verified performance or privacy findings (BinaryConverter.org).
Rank #2
Keep bits, bytes and prefixes straight
A bit (b) and a byte (B) are not interchangeable: 1 byte = 8 bits. Bit-rate units commonly describe transfer rates, while byte units commonly describe storage capacity. Read the unit symbol and the context before comparing values.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →| Unit | Equivalent in bytes | Prefix system |
|---|---|---|
| 1 kB | 1,000 bytes | Decimal SI |
| 1 KiB | 1,024 bytes | Binary IEC |
| 1 MB | 1,000,000 bytes | Decimal SI |
| 1 MiB | 1,048,576 bytes | Binary IEC |
NIST distinguishes the SI decimal prefixes from IEC binary prefixes. In the IEC system, Ki means 2¹⁰, Mi means 2²⁰, Gi means 2³⁰, Ti means 2⁴⁰, Pi means 2⁵⁰ and Ei means 2⁶⁰. The “i” signals a binary multiplier; do not assume that kB and KiB, or MB and MiB, mean the same quantity. See NIST’s guide to SI prefixes and conversion factors.
Rank #3
Verify a conversion before relying on it
NIST’s recommended approach is practical: identify the starting and target units, choose a suitable factor, cancel units, calculate, check whether the result is plausible, and round only the final result. Keeping units visible through the calculation helps reveal a reversed factor or a mistaken bit/byte assumption. NIST details this approach in SP 811’s conversion guidance.
- Write down the exact input value and unit or base.
- Set the target unit or base explicitly; do not rely on a tool’s default.
- Check the factor or intermediate conversion, including whether a prefix is decimal or binary.
- Review the result for plausibility and retain sufficient precision during calculation.
- Round the final value to the precision appropriate for its use.
For software used in trade, commerce, specifications or other critical applications, NIST advises verifying factors and rounding against an authoritative reference. Relevant references include NIST SP 811 and IEEE/ASTM SI 10. A converter’s output alone is not a substitute for checking its factor and rounding behavior.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Binary numerals are not text encodings
A number written in binary is different from text represented as bytes. A base converter can turn the numeral 65 from decimal into binary, but that does not by itself establish which character a byte represents. Text encoding systems define how character data maps to byte sequences; converting numeral bases and decoding text answer different questions.
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