Cost only tells one part of the story.
The lower price can be right while you test. The useful line is the month where storage overage changes the decision. This model makes that line explicit from your inputs.
Give your app room to grow before storage turns cheap into costly.
Use your own plan limits and growth assumptions. This is a planning model, not live provider pricing or an uptime claim.
Interactive cost model
Test with eyes open.
Compare a lower-cost test plan with a higher-capacity plan. Storage changes are saved in this browser so a reload keeps your scenario.
$0Test plan total
$0Growth plan total
0 GBStorage at end
$0Cost difference
No invented vendor data.
Prices, included storage, and growth are deliberately editable. The model makes no claim about Supabase availability, actual plan terms, or a competitor's status.
Headroom
Included storage is compared to projected usage every month.
Runway
See when each plan first crosses into overage.
Portable result
Export the useful month-by-month calculation as CSV.
| Month | Storage | Test plan cost | Test plan overage | Growth plan cost | Growth plan overage |
|---|
Capacity choices
Build for the next constraint, not the last outage.
Use the result as a transparent planning aid while you verify live pricing and reliability requirements yourself.
Start with a bounded test
Set the lowest plan you would actually pay, then choose a short horizon. The result shows whether your current storage profile fits it without surprise overage.
Model growth honestly
Use a monthly GB estimate that includes uploads, generated files, and backups that count toward your storage model.
Separate price from reliability
A calculator cannot prove service availability. Keep reliability requirements as a separate verification task with the providers you are considering.
Make the storage tradeoff visible before your users do.
Change one assumption, export the arithmetic, and keep a concrete capacity conversation with your team.
Linear storage growth and monthly overage
Read the explanation
This saved planning calculator starts with eighteen gigabytes and adds eight gigabytes per month. Its first row is current storage, not current storage plus a growth increment. Month twelve is eighteen plus eight times eleven, or one hundred six gigabytes. Bars compare final and first-month storage at five pixels per gigabyte. The model does not compound growth, delete data or add backups automatically. Monthly rows are bounded between one and thirty-six. These inputs are editable assumptions and do not establish live vendor prices, quotas or availability. The test plan has twenty gigabytes included and five dollars base cost. At month two, twenty-six gigabytes exceeds that allowance by six, so twelve cents per extra gigabyte gives seventy-two cents of overage and five dollars seventy-two total. The growth plan includes one hundred gigabytes and costs fifteen dollars, so that month has no growth-plan overage. Bars compare these two monthly costs at thirty pixels per dollar. Usage below allowance is clamped to zero overage. Price differences alone do not measure reliability, support, transfer, requests or any charge that is absent from the model. For the default twelve rows, test-plan excess gigabytes sum to five hundred six. Five dollars times twelve plus point twelve times five hundred six totals one hundred twenty dollars seventy-two. Growth allowance is exceeded only in the last row by six gigabytes, giving one hundred eighty dollars seventy-two total. The absolute difference is sixty dollars. Bars use two point five pixels per total dollar. The CSV contains every row and the current inputs. A cheaper result is conditional on those assumptions and excludes migration costs, outages, changing prices and any non-storage charges.