Examples
Examples
Try the starting example
- New-period support allowance (minutes)
- 60
- Opening carried minutes
- 20
- Counted billable session minutes
- 30,50,20
- Next-period carry limit (minutes)
- 30
- Entered overage price per minute ($)
- 2
- Counted session minutes
- 100
- Minutes covered by current pool
- 80
- Overage minutes
- 20
- Unused minutes before next carry cap
- 0
- Minutes carried to next period
- 0
- Overage charge under entered rate ($)
- $40.00
Try another scenario
- New-period support allowance (minutes)
- 60
- Opening carried minutes
- 20
- Counted billable session minutes
- 30,20
- Next-period carry limit (minutes)
- 30
- Entered overage price per minute ($)
- 2
- Counted session minutes
- 50
- Minutes covered by current pool
- 50
- Overage minutes
- 0
- Unused minutes before next carry cap
- 30
- Minutes carried to next period
- 30
- Overage charge under entered rate ($)
- $0.00
Calculation method
Calculation method
Counted session minutes
Sum supplied whole-minute billable sessions.
Minutes covered by current pool
min(usage,new allowance+opening carry).
Overage minutes
max(0,usage−available pool).
Unused minutes before next carry cap
max(0,available pool−usage).
Minutes carried to next period
min(unused,next-period carry cap).
Overage charge under entered rate ($)
Overage minutes×entered per-minute price, exactly in US cents.
Symbols and units
- a
- New-period support allowance (minutes)
- b
- Opening carried minutes
- c
- Counted billable session minutes
- d
- Next-period carry limit (minutes)
- e
- Entered overage price per minute ($)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- A supplied allowance/rollover/overage ledger for one period. It does not classify sessions as billable, infer contract rules or charge a customer.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
Zendesk: response metrics and business-hour definitions; this tool uses its displayed convention ↗
Background reading; this does not imply endorsement or independent review of SumFizz.