Blog
Finance

Monthly cash flow calculator

Enter the starting cash balance and add inflow and outflow for each month. The calculator works out the balance at the end of each month and shows a chart.

Inflow and outflow by month

Month Inflow Outflow Remove row
1
2
3
4

Result

Balance at period end

Total inflow
Total outflow
Net change

Your inputs are stored in this browser, so everything is still here next time. Nothing is sent to a server.

This calculation is for informational purposes only and does not replace advice from a qualified professional. Formulas and rates may not fit your exact situation — double-check the figures before making decisions.

How it is calculated

Balance at the end of a month = balance at the end of the previous month + this month's inflow − this month's outflow. The calculation runs sequentially from the starting balance through all entered months — a simple monthly cash flow ledger, not a discounted calculation.

The balance-by-month chart immediately shows which month the balance dips below zero, if it does — that's a cash gap: even if total inflow exceeds total outflow over the whole period, a specific month can still run short because receipts and payments don't land evenly.

This is an operational planning tool, not an investment appraisal — unlike NPV and cash flow discounting, amounts here aren't converted to present value, because the question is different: will there be enough cash in each specific month.

Other calculators

All calculators