Comprehensive Guide
Learn more in our Personal Finance Guide.
How it works
A side hustle is a small compounding engine, and this calculator runs it forward. Give it a starting monthly income, a monthly growth rate and a horizon, and it projects the total the hustle earns — along with the figure that separates a real business from a hobby: the effective hourly rate, total earnings divided by the hours you actually put in. The growth rate is where the projection lives or dies. A hustle growing 3% a month sounds modest, but compounding turns $500 a month into about $690 within a year and far more by year three; a flat hustle earns the same $500 forever. Be honest about both levers. The growth rate should reflect a real trend you have observed, not a hope — early hustles often grow fast then flatten. And the hours input disciplines the whole exercise: a hustle earning $1,000 a month on five hours a week is a genuine business at a strong hourly rate, while the same income on thirty hours is a second job paying poorly. The point of the tool is to see your own numbers clearly enough to decide whether to scale it, sustain it, or shut it down.Formula
Each month: income x (1 + growth) | total = sum of all months | hourly = total / total hours
Tips
- Even 3% monthly growth compounds fast — $500 becomes about $690 within a year.
- Base the growth rate on a real trend you have observed, not on hope.
- The effective hourly rate separates a real business from a low-paid second job.
- Divide earnings by the hours you actually work — be honest about the time.
- Use the projection to decide: scale it, sustain it, or shut it down.
Frequently asked questions
How do I project side hustle income?
Start with your current monthly income and compound it at a realistic monthly growth rate over your horizon. Even 3% a month turns $500 into about $690 within a year. The calculator sums every month for total earnings and divides by hours for your effective hourly rate.
What growth rate should I assume?
One you have actually observed, not one you hope for. Early hustles often grow fast — 10% a month or more — then flatten as the market saturates. Use a conservative figure; a projection built on hopeful growth is a fantasy, not a plan.
What is a good effective hourly rate for a side hustle?
One that beats what your time is worth elsewhere, including rest. A hustle earning $1,000 a month on five hours a week pays about $46 an hour — a real business. The same income on thirty hours a week pays about $7.70, which is a poorly-paid second job.
Should I count all the hours I spend?
Yes — the honest hourly rate is what disciplines the whole exercise. Count the admin, the marketing, the learning curve and the dead time, not just the billable work. A hustle only looks profitable when the denominator is honest.
When does a side hustle become worth scaling?
When the effective hourly rate beats your alternatives and the growth is real and repeatable. If both hold, scaling often makes sense. If the rate is poor or the growth has stalled, the projection tells you to fix the model or reclaim the time.