FORMULA
See each term
Base = E + K + R. Low and High apply your uncertainty percentage to the entire base. Read the full formula explanation.
YOUR NUMBERS, YOUR ASSUMPTIONS
Your memory budget
Enter a runtime estimate and see a low, base and high memory range. Every prefilled amount is an editable assumption.
All values use decimal GB. The result is a planning estimate, not a compatibility or performance guarantee.
Set your assumptions
Use runtime memory from your own measurements or research. Download size is not runtime memory.
THE ROOM THAT REMAINS
Your estimate will appear here.
Add a runtime memory estimate, then calculate to see a range and breakdown.
Calculating your range…
Using the assumptions in this form.
Check your assumptions.
Correct the highlighted field to calculate a result.
No estimate is shown while an input is invalid.
Low
Base
High
- E · Runtime model
- K · Context/cache
- R · OS/apps
Base headroom
Compare with your Mac
Add installed memory above to see upper-bound and base headroom.
Actual use varies with runtime, settings, context and other apps. This estimate is not a fit guarantee.
ILLUSTRATIVE ARITHMETIC ONLY
Try a memory scenario
Each example uses a 12 GB runtime estimate, 1 GB context/cache, 2 GB OS/apps, and ±20% uncertainty: a 15 GB base and 12–18 GB range. These are arithmetic examples, not model or hardware recommendations.
SOURCES
Know what a source supports
References describe model/download information, API controls, and hardware configurations. They are not runtime-memory benchmarks. See sources and evidence boundaries.