Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Block subsidy after halvings
1.5625
New coins per year
82,181
Annual issuance rate
0.42%
Stock-to-flow ratio
240.9
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How to use this
- 1Enter current block subsidy (BTC).
- 2Enter average block time (min).
- 3Enter circulating supply (BTC).
- 4Enter halvings ahead.
- 5Read your block subsidy after halvings on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Model the issuance schedule: block reward, coins minted per year, and the stock-to-flow ratio after the next halving.
Worked example
Using the values the calculator loads with:
Inputs
- Current block subsidy: 3.125 BTC
- Average block time: 10 min
- Circulating supply: 19800000 BTC
- Halvings ahead: 1
Results
- Block subsidy after halvings: 1.5625
- New coins per year: 82,181.25
- Annual issuance rate: 0.42%
- Stock-to-flow ratio: 240.9
What each field means
Inputs
- Current block subsidy (BTC)
- The current block subsidy used in the calculation, measured in BTC. Starts at 3.125 BTC so you have a working example on load.
- Average block time (min)
- The average block time used in the calculation, measured in min. Starts at 10 min so you have a working example on load.
- Circulating supply (BTC)
- The circulating supply used in the calculation, measured in BTC. Starts at 19800000 BTC so you have a working example on load.
- Halvings ahead
- The halvings ahead used in the calculation. Starts at 1 so you have a working example on load. Accepted range: 0–10.
Results
- Block subsidy after halvings
- Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- New coins per year
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Annual issuance rate
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Stock-to-flow ratio
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the bitcoin halving supply model work?
Model the issuance schedule: block reward, coins minted per year, and the stock-to-flow ratio after the next halving.
What do I need to enter?
4 values: current block subsidy, average block time, circulating supply, and halvings ahead. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the block subsidy after halvings result mean?
It is returned as a decimal number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Bitcoin Halving Supply Model. Retrieved from https://www.revenuelab.fyi/toolbox/bitcoin-halving-model
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/bitcoin-halving-model" target="_blank" rel="noopener">Bitcoin Halving Supply Model — RevenueLab</a> (2026).</p>
Source: [Bitcoin Halving Supply Model — RevenueLab](https://www.revenuelab.fyi/toolbox/bitcoin-halving-model) (2026).