How do you estimate project hours?

Break the project into phases (discovery, design, development, testing, deployment). Estimate hours for each phase, add 10-20% overhead for communication and project management, and 10-15% contingency for unknowns. Our calculator handles the math automatically.

What overhead percentage should I use?

For freelancers, 10-15% overhead covers client communication, revisions, and admin. For agencies, 15-25% covers project management, internal meetings, and coordination. Higher complexity projects need higher overhead percentages.

What is contingency in project estimation?

Contingency is a buffer for unknowns — scope changes, technical surprises, or delays. Industry standard is 10% for well-defined projects and 20-30% for ambiguous ones. It protects your budget from the unexpected without padding individual estimates.

Can I use different hourly rates per phase?

Yes. Set a different rate for each phase. Design work might be $150/hour while development is $200/hour and QA is $100/hour. The calculator shows cost per phase and the blended total.

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Project Hours Calculator

Most freelancers quote base hours and forget that 15-20% of every project is communication, revisions, and project management. Then the scope shifts and there's no contingency buffer. This calculator adds overhead (15%) and contingency (10%) on top of your phase estimates so you quote $39,375 instead of the $31,500 that would have you working for free by month three.

15–20%

Avg Overhead

10–20%

Contingency

$150/hr

Avg Blended Rate

4–6 typical

Phases

By SplitGenius TeamUpdated February 2026Reviewed for accuracy

To estimate a project budget, break it into phases, estimate hours per phase, and multiply by hourly rate. Add 10-20% overhead for project management and 10-15% contingency for unknowns. A 200-hour project at $150/hr with 15% overhead and 10% contingency: 250 total hours, $37,500 budget. Enter your phases below.

Project Settings

Project Name

Overhead

Meetings, communication, admin

Contingency

Buffer for unknowns and scope changes

Project Phases

hrs

$/hr

hrs

$/hr

hrs

$/hr

hrs

$/hr

Base hours: 160h

Project Cost by Size — $150/hr Blended Rate

Total project cost estimates at $150/hr with 15% overhead and 10% contingency.

Project Size	Base Hours	Base Cost	With OH + Cont.	Duration
Small	40 hrs	$6,000	$7,590	1–2 weeks
Medium	120 hrs	$18,000	$22,770	4–6 weeks
Large	300 hrs	$45,000	$56,925	3–4 months
Enterprise	600 hrs	$90,000	$113,850	6–8 months
Major build	1,200 hrs	$180,000	$227,700	10–14 months

How This Calculator Works

Enter Your Details

Fill in amounts, people, and preferences. Takes under 30 seconds.

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See an instant breakdown with data-driven calculations and Fairness Scores.

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How to Estimate Project Hours and Budget

Accurate project estimation prevents scope creep, budget overruns, and client disputes. The key: break work into small phases, estimate each separately, then add buffers for the work you can't predict.

Phase-Based Estimation

Every project has natural phases. For a web project: discovery (10%), design (20%), development (40%), testing (15%), deployment (5%), and project management (10%). Estimate each phase independently — people are more accurate estimating small chunks than entire projects.

Why Overhead and Contingency Matter

Overhead covers the hidden time: client calls, email, status meetings, context switching, code reviews, and documentation. For freelancers, 10-15% is typical. For agencies with multiple stakeholders, 20-25%.

Contingency covers unknowns: API changes, unclear requirements, technical debt, browser bugs, third-party delays. A well-scoped project needs 10% contingency. An ambiguous one needs 25-30%.

Example: $50K Website Project

Phase	Hours	Rate	Cost
Discovery	20h	$150	$3,000
Design	50h	$150	$7,500
Development	120h	$175	$21,000
Testing	30h	$125	$3,750
Subtotal	220h		$35,250
+ 15% Overhead	33h		$5,288
+ 10% Contingency	22h		$3,525
Total	275h		$44,063

For splitting work across a team, use the workload distribution calculator. For revenue sharing between partners, try the revenue share calculator.