Before You Spend, Estimate the Return
Every purchase — a tool, an ad campaign, a hire — is an investment. Return on Investment (ROI) tells you whether it pays off.
The Formula
ROI % = (Gain from Investment − Cost of Investment) ÷ Cost of Investment × 100
Payback Period = Cost of Investment ÷ Periodic Return
Example: A $1,200 Software Tool
Suppose the tool saves you 10 billable hours/month at $80/hour = $800/month.
| Item | Value |
|---|---|
| Cost | $1,200 |
| Monthly return | $800 |
| Annual return | $9,600 |
| ROI (year 1) | ($9,600 − $1,200) ÷ $1,200 = 700% |
| Payback | $1,200 ÷ $800 = 1.5 months |
A <2-month payback and a 700% first-year ROI is an easy yes.
Example: A $5,000 Ad Test
If the campaign returns $6,000 in profit over the year, ROI is 20% and payback is ~10 months. Respectable but slower — and ad returns are less certain than time savings, so weight the risk.
Make ROI Honest
- Include all costs: subscription, setup, your time.
- Value your time at a realistic billable rate.
- Separate one-time gains from recurring returns — recurring compounds.
Don't ignore risk: A 100% ROI on a speculative bet is not equal to 100% on a sure thing. When outcomes are uncertain, prefer shorter payback periods.
ROI vs Payback
ROI measures magnitude; payback measures speed and safety. Use both: a high ROI with a long payback may tie up cash you need elsewhere.