Scope Creep Cost Calculator
See how much free work you did on your last project - and what your real hourly rate is after scope creep.
Scope creep is the #1 reason agencies lose money on fixed-fee projects. Here's how to protect yourself:
- Write a detailed Statement of Work (SOW) - list what's in and out of scope upfront.
- Build a scope buffer - add 10-20% extra hours in your estimate to absorb inevitable changes.
- Use a change-request process - every extra request gets a formal change order with revised pricing and timeline.
- Set review milestones - check scope at key milestones instead of waiting until the end.
- Invoice incrementally - progress billing reduces the risk of unpaid scope-extra work.
Set up a change-request workflow in Worklenz - free.
Stop doing free work. Capture every scope change as a formal change request so you can bill for it. No more leaving money on the table.
- Change Request Management
Create formal change requests for extra scope - clients approve before work begins - Integrated Billing
Bill automatically from approved change requests - no manual invoice creation - Scope Change Tracking
See exactly how much extra work was requested and by whom in real time - Profit Protection
Never work for free again - every scope change has a price tag and approval workflow
Why use it through Worklenz?
Use Worklenz change requests to approve scope and bill for it - no more free work.
Free for teams up to 5 people · No credit card required
Frequently Asked Questions
Your questions answered
Scope creep is when extra work is added to a project without adjusting the fee, timeline, or contract. A feature was not in the original quote, the client 'just needs one more small thing', but those small things add up. Even 10-20 extra hours on a fixed-fee project is real money that you never invoice.
Enter your original project fee, your estimated hours at project start, how many hours you actually worked, and your hourly billing rate. Choose whether the extra hours were billed. If partially, enter how many were recovered. Results update in real time.
It's simply the original project fee divided by every hour you actually worked - billed and unbilled combined. For example: $25,000 ÷ 160 hours = $156/hr effective, even though you billed at $200/hr.
Because your overhead, software subscriptions, admin time, and salary costs are usually spread across billable hours. When you work more hours for the same fee, each additional hour dilutes your profit margin. This calculator estimates margin erosion based on a 55% cost-per-hour ratio.
It's most valuable for fixed-fee and retainer work where the fee is set upfront. For time-and-materials projects the math is simpler - you invoice for every hour. But fixed-fee freelancers and agencies lose the most money to scope creep precisely because stoppable hours don't automatically mean more revenue.
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Absolutely. Most professional project managers build a 10-20% scope buffer into their time estimates - a margin for inevitable client revisions, missing requirements, and unexpected complexity. Worklenz's Project Budget Tracker lets you log expenses against budget in real time so you never go over.