Growth Rate Modeler
Project a starting value forward at a fixed growth rate per period, with a full schedule table.
Written by Golam Rabbani, Founder & Lead Engineer
How to use this growth rate modeler
- Enter the starting value (e.g., current monthly revenue or user count).
- Enter the growth rate per period as a percentage (negative for decline).
- Enter how many periods to project — maximum 240 (e.g., 20 years monthly).
- Press Run model to see the value at each period and the gain over the previous period.
- Copy the table as CSV to drop into a spreadsheet for further analysis.
About this growth rate modeler
The growth rate modeler projects a starting value forward at a fixed compound growth rate per period and shows the full period-by-period schedule, not just the endpoint. This is the right shape for any "what if we grow at X% per Y for Z periods" question — revenue forecasts, user-base projections, audience growth, savings buckets, even debt schedules with negative growth.
Worked example: a startup at $1,000 MRR projects 10% month-over-month growth for 12 months. Period 1 = 1,000 × 1.10 = $1,100, period 2 = $1,210, period 6 ≈ $1,771, period 12 ≈ $3,138. Total growth across the year ≈ 213.84%. The table makes it obvious where revenue crosses every milestone, and copying the CSV lets you chart it or feed it into a budget.
A negative rate models decline at compound speed — useful for stress-testing what happens if growth flips. All math runs locally in your browser.
FAQ
- What does "per period" mean — month, quarter, year?
- Whatever unit you decide. The calculator does not assume a calendar; if you enter 12 periods at 10%, that could mean 12 months at 10% MoM growth, or 12 years at 10% YoY growth — the math is identical. Label the unit in your write-up.
- Why is the maximum 240 periods?
- A safety limit to keep the result table readable and the calculation instant. 240 covers 20 years of monthly periods, which is plenty for any practical scenario.
- Can growth be negative?
- Yes — enter a negative rate to model decline. The value shrinks each period by that percentage. Useful for modelling churn-driven shrinkage, asset depreciation, or any falling series.
- Is this the same as compound interest?
- Mathematically, yes. The calculator uses Vₙ = V₀ × (1 + r)ⁿ — the same formula as compound interest with no extra contributions. Use the dedicated Compound Interest Calculator if you want periodic deposits and an interest split.
- Does the tool store my projection?
- No. All math runs locally in your browser. Nothing is uploaded or saved; refreshing the page clears the projection.