Guide
What Are Satoshis (Sats)? 1 BTC = 100 Million Satoshis, Plus the mBTC Conversion Table
The bottom line
Bitcoin's smallest unit is the "satoshi" (often shortened to "sats"), and 1 BTC = 100,000,000 satoshis (100 million sats). That means one satoshi equals 0.00000001 BTC. When someone who bought a small amount sees "0.00042000 BTC" and "42,000 sats" on their screen, those are simply two ways of writing the exact same amount. Below BTC sit a ladder of units — mBTC (millibitcoin), μBTC (microbitcoin), bits, and sats — all connected by powers of ten. This article walks through the conversion table, how to read each unit, and why displaying balances in sats has become increasingly common.
Key points
- 1 BTC = 100,000,000 satoshi (100 million sats); the smallest unit is 1 satoshi = 0.00000001 BTC.
- mBTC = 1/1,000 BTC (100,000 sats); μBTC = bits = 1/1,000,000 BTC (100 sats).
- On the blockchain, every amount is recorded internally as a whole number of satoshis.
- As the price rises, decimals become hard to read, so "sats-denominated" displays that make small amounts intuitive are on the rise.
What is a satoshi?
A satoshi is the smallest unit you get when you divide bitcoin into finer pieces. The name comes from "Satoshi Nakamoto," the anonymous figure credited with creating Bitcoin. We cover how Bitcoin itself works in What is Bitcoin?, but the key point here is simple: 1 BTC can be broken down much further.
What matters most is that Bitcoin's software handles amounts internally as whole-number satoshis, not as BTC. 0.5 BTC is recorded internally as the integer "50,000,000 satoshis." This design avoids rounding errors from decimal math, and the "BTC display" we see is just a human-friendly conversion of those underlying integers.
How many satoshis in 1 BTC? The core conversion
There's really only one thing to memorize:
- 1 BTC = 100,000,000 sats (100 million satoshis)
- 1 sat = 0.00000001 BTC (eight decimal places)
Bitcoin can be divided down to eight decimal places. That is the smallest unit at present, and anything finer cannot be handled by ordinary on-chain transactions (the Lightning Network, discussed below, is the exception).
Conversion table (mBTC, μBTC, bits, sats)
Between BTC and the satoshi sit several intermediate units. Because exchanges and wallets display them differently, it helps to have them all in one place.
| Unit | Reading | In BTC | In satoshis |
|---|---|---|---|
| BTC | bitcoin | 1 BTC | 100,000,000 sats |
| mBTC | millibitcoin | 0.001 BTC | 100,000 sats |
| μBTC / bits | microbitcoin / bits | 0.000001 BTC | 100 sats |
| sat | satoshi | 0.00000001 BTC | 1 sat |
The trick to converting is to shift the digits three places at a time. Going from 1 BTC to mBTC multiplies by a thousand (three digits); from mBTC to μBTC (bits) multiplies by another thousand (three digits); and 1 bit = 100 sats. Note that "bits" was standardized as "100 satoshis = 1 bit" in BIP 176 (proposed in 2017), but in everyday practice "sats" is far more widely used, as explained below.
Making unit conversion tangible with examples
Numbers alone can be hard to feel, so let's look at concrete amounts (the figures here are illustrative assumptions; actual rates fluctuate constantly).
- 0.001 BTC = 1 mBTC = 100,000 sats
- 0.0005 BTC = 0.5 mBTC = 500 bits = 50,000 sats
- 0.00001 BTC = 10 bits = 1,000 sats
- A small purchase worth a few dollars → in BTC it reads as "0.0003…" with a string of zeros, but in sats it's an easy-to-read "about 30,000 sats"
The actual steps for starting small are laid out in How to buy bitcoin with a small amount. Getting comfortable with the units first helps you avoid the classic mistake of being off by a digit on the purchase screen.
Why "sats-denominated" displays are on the rise
In recent years, wallets and some services have increasingly shown amounts in "sats." There are three main reasons.
- Rising prices made decimals hard to read — the higher 1 BTC climbs, the more everyday small amounts look like "0.00004200 BTC," a string of zeros that's easy to miscount. "4,200 sats" is a whole number and far more intuitive.
- Psychological barrier — people who feel "1 BTC is too expensive to buy" find "anyone can hold satoshis" much easier to grasp, and it's easier to feel that you own a piece of bitcoin.
- A natural fit for micropayments — small, fast transfers over the Lightning Network already deal in satoshi-scale amounts. On Lightning, amounts are even handled internally down to the "millisatoshi (msat)," which is one-thousandth of a satoshi.
In other words, sats-denominated displays are a practical shift in how amounts are shown, in step with the movement to use bitcoin as everyday money.
Watch out for mixing up units
When sending or buying, confusing BTC-denominated and sats-denominated figures can lead you to send an amount that's off by a factor of 100 or even 10,000. Just as you would with a sending address, always double-check both the amount and the unit every time. This article is educational content about units, not investment advice. Crypto assets are highly volatile and you can lose money. Any buy or sell decision is your own responsibility, and you should confirm the latest rates and fees through each exchange's official information.
Frequently asked questions
Q. How much is 1 satoshi worth? A. Its value in fiat changes constantly with the price of 1 BTC. You can estimate one satoshi with "the price of 1 BTC ÷ 100 million." For an exact figure, check the rate through an official source at the time of your transaction.
Q. Is there a unit smaller than a satoshi? A. For ordinary on-chain transactions, the satoshi (0.00000001 BTC) is the smallest. However, inside the Lightning Network, amounts are calculated down to the "millisatoshi (msat)," which is one-thousandth of a satoshi.
Q. Should I use "sats" or "bits"? A. Both express small amounts, but "sats" (the single-satoshi unit) is now the mainstream choice. "bits" (= 100 sats) is the term standardized in BIP 176 and is used by some wallets.
Q. Why are amounts managed internally in satoshis? A. To avoid rounding errors from decimal math. Working with whole numbers eliminates the problem of remainders that don't divide evenly, so transfer amounts can be matched exactly.
Sources
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FAQ
- How much is 1 satoshi worth?
- Its value in fiat changes constantly with the price of 1 BTC. You can estimate one satoshi with "the price of 1 BTC ÷ 100 million (100,000,000)." For an exact figure, confirm the official rate at the time of your transaction.
- Is there a unit smaller than a satoshi?
- For ordinary on-chain transactions, the satoshi (0.00000001 BTC) is the smallest unit. However, the internal calculations of the Lightning Network handle amounts down to the "millisatoshi (msat)," which is one-thousandth of a satoshi.
- Should I use "sats" or "bits"?
- Both express small amounts, but "sats" (the single-satoshi unit) is now the mainstream choice. "bits" (= 100 sats) is the term standardized in BIP 176 and is used by some wallets.
- How many satoshis are in 1 BTC?
- 1 BTC = 100,000,000 satoshis (100 million sats). Conversely, 1 satoshi = 0.00000001 BTC, and bitcoin can be divided down to eight decimal places.
This article is informational only and is not financial, investment, or trading advice. Prices are reference snapshots and may be outdated. Always do your own research.
