Build a line-item project budget in seconds. List labor by phase and role with hours and hourly rates, add materials and other costs, then apply overhead, a contingency reserve, sales tax and an optional markup. You get the total, the split by phase and by role, and every line in a downloadable table.
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Labor
One line per role and phase. Separate with |, tab or comma. The phase is optional (Role | Hours | Rate).
Materials, software & other costs
Fixed costs such as equipment, licences, subcontractors and travel.
Percentages
%
Benefits, payroll taxes, office costs.
%
Often 5–15%; more for uncertain work.
%
%
Only if you are pricing the work for a client.
Enter your values to see the result.
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How to use the Project Budget Calculator
Enter labor lines as Phase | Role | Hours | Rate, one per line (the phase is optional).
Enter materials and other costs as Phase | Item | Cost, or Phase | Item | Qty | Unit cost.
Set overhead and contingency percentages, plus sales tax and markup if they apply.
Read the total budget and the breakdown into labor, materials, overhead and reserve.
Check the phase and role tables, then download them as CSV for your plan or proposal.
The project budget formula
Labor = Σ (hours × hourly rate) for every role and phase
Overhead = labor × overhead %
Direct cost = labor + materials + sales tax on materials + overhead
Example (the default inputs): 620 labor hours costing $43,850, plus $6,000 of materials, 15% overhead on labor ($6,577.50) and a 10% contingency on the $56,427.50 direct cost ($5,642.75) give a total budget of $62,070.25.
Typical contingency by project certainty
Situation
Common contingency
Why
Repeat project, fixed scope
3% – 5%
Costs are known from past work
Detailed plan, familiar work
5% – 10%
Small estimate errors and minor changes
New technology or vendor
10% – 20%
Learning curve and integration surprises
Early concept, scope still moving
20% – 30%+
Most costs are still assumptions
These are planning rules of thumb, not standards. Many organizations set their own policy, and construction or government projects often have required reserves.
Tips for a realistic budget
Budget by phase so you can compare plan and actuals as each phase ends; the earned value calculator helps with that.
Do not forget non-build time: meetings, reviews, testing, rework, training and handover.
Use loaded rates or add overhead, otherwise in-house labor will look cheaper than it is.
Keep contingency visible as its own line instead of padding every estimate, so it can be managed and released.
Frequently asked questions
How do you calculate a project budget?
Add up direct labor (hours × hourly rate for each role), materials and other direct costs, then add overhead and a contingency reserve: Total = (Labor + Materials + Tax + Overhead) × (1 + contingency %). If you are quoting a client, apply your markup on top of that.
How much contingency should a project budget include?
A common range is 5% to 10% for well-understood work and 10% to 20% or more for new, complex or early-stage projects. The less defined the scope, the larger the reserve should be. Use the PERT or risk estimates for your riskiest tasks to size it rather than picking a number at random.
What is the difference between contingency and markup?
Contingency is money held back inside the budget for known risks and estimate errors; it is still cost. Markup is added on top to cover profit and business risk when selling the work. This calculator applies contingency first, then markup on the result.
What should overhead on labor include?
Overhead (or labor burden) covers costs tied to employing people that are not in the hourly wage: payroll taxes, benefits, paid time off, equipment and a share of office costs. If your rates are already fully loaded or are contractor rates, set overhead to 0%.
Can I paste a budget from a spreadsheet?
Yes. Copy columns from Excel or Google Sheets in the order phase, role, hours, rate (or phase, item, cost) and paste them in. Tab-separated, pipe-separated, semicolon-separated and comma-separated lines all work; use | or tabs if your amounts contain thousands separators.
What is a blended rate?
The blended hourly rate is total labor cost divided by total labor hours. It is handy for quick estimates of change requests: multiply extra hours by the blended rate to estimate their cost.
Is my budget stored online?
No. The calculation runs in your browser and nothing is uploaded. Your last inputs are kept only in this browser so you can pick up where you left off.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.