Calculate runway, zero-cash date, fundraising start date and milestone coverage. Test the exact levers that extend execution time before cash becomes critical.
A startup may have twelve months of runway and still be in trouble if its next funding, launch or revenue milestone takes fifteen months. Strong runway planning connects cash depletion to execution dates, fundraising lead time and a minimum safety buffer. It also shows which actions actually extend survival: lower burn, faster revenue or new capital.
Estimate when available cash may run out under the current burn and growth assumptions.
Work backwards from the zero-cash date using the fundraising lead time selected by the founder.
Check whether current cash is sufficient to reach launch, profitability or the next capital event.
Compare the effect of cost savings, new revenue and additional capital on execution time.
A burn rate calculator focuses on monthly cash loss. A runway calculator converts that loss into time and connects it to zero-cash dates, milestones and fundraising timing.
The tool subtracts the selected fundraising lead time from the estimated zero-cash date. Founders should usually add more time when market conditions are difficult.
If monthly net burn is zero, the calculator treats runway as not limited by operating burn. One-time expenses, debt and working-capital needs can still create cash risk.
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