How do I commission a custom financial or engineering calculator?

Select your desired tier or project scope, review the delivery timeline, and submit your requirements. Our engineering team builds and tests your bespoke web calculator or Excel pro forma model with full client-side execution.

Can I export and share these results?

Yes, you can generate shareable state links, export clean CSV spreadsheets, or print high-resolution executive reports with a single click.

Is this calculator free to use?

Yes, all calculation engines on ToolsVault are 100% free with no account registration or paywall required.

Turn Mathematical Solvers Into High-Ticket Inbound Orders

High-Yield Freelance Gigs & Quick-Response Engine

Monetize your existing 1,000+ custom web calculators, CRE underwriting models, and contractor bidding spreadsheets as professional agency services on Fiverr, Upwork, and direct client contracts ($50 to $350 per delivery).

Open Fiverr.com

Portfolio Decks Staged 3 Verified PDFs

Average Order Value $150 – $350

Turnaround Time 24 – 48 Hours

Fiverr Agency Profile Details

Copy & paste into your Fiverr Seller Profile

Display Name

ToolsVault Studio

Profile Tagline

Financial Modeling, Custom Interactive Web Calculators & Contractor Engines

About the Seller Description (Bio):

Programming & Tech • Web Applications

Gig 1: Custom Interactive Web Calculators & ROI Widgets

Download PDF Portfolio Deck

Gig Title

I will develop a custom financial calculator or ROI web widget in javascript

5 Search Tags

custom calculator financial calculator roi calculator web calculator javascript calculator

Pricing Packages:

Basic $75

Single Interactive Web Calculator. 1-day delivery. Vanilla JS/HTML5/CSS3. Zero dependencies.

Standard $175

Multi-Variable Calculator with Dynamic SVG / Canvas Charts & Lead Capture Form Modal.

Premium $350

Enterprise Embeddable Widget Suite. Custom brand styling, CSV/PDF export, Webhook/Zapier forwarding.

Gig Description:

Business • Financial Modeling

Gig 2: Commercial Real Estate (CRE) Pro Formas & DSCR Models

Download PDF Portfolio Deck

Gig Title

I will build a commercial real estate financial model and DSCR pro forma in excel

5 Search Tags

financial model real estate underwriting cre pro forma dscr loan excel financial model

Pricing Packages:

Basic $50

Single Property DSCR Quick-Check. NOI, debt coverage, amortization schedule, clean PDF export.

Standard $150

Multi-Family / Commercial 5-Yr Pro Forma. Rent roll, CapEx reserve planning, IRR, Cash-on-Cash, exit sensitivity.

Premium $350

Institutional Multi-Tier Waterfall & Debt Suite. GP/LP equity waterfall, hurdle rates, bank deck.

Gig Description:

Business • Construction & Estimating

Gig 3: General Contractor & MEP Cost Estimating Suites

Download PDF Portfolio Deck

Gig Title

I will build a construction cost estimating spreadsheet and contractor bid suite

5 Search Tags

construction estimating cost estimator contractor bid takeoff spreadsheet excel estimator

Pricing Packages:

Basic $45

Single Trade Material & Labor Takeoff. Roofing, HVAC, Electrical, or Concrete with statutory burdens.

Standard $125

CSI 16-Division MasterFormat Bid Suite. Subcontractor leveling comparison, client bid proposal template.

Premium $275

Enterprise Subcontractor Operations & Bid OS. Job costing, change order log, AIA G702/G703 billing layout.

Gig Description:

Client Messaging • 100% Response Rate

Automated Client Communication Templates

1. Initial Inquiry Response (Under 5-Min Response)

Hi [Name]! Thanks for reaching out. Yes, I can certainly build this for you. 

To ensure the calculation logic matches your exact requirements, could you share:
1. The mathematical formulas or spreadsheet (Excel / Google Sheet) you are working from?
2. Where you plan to host or embed this tool (WordPress, Webflow, custom website, or internal use)?

Once reviewed, I'll send over a custom milestone quote and estimated delivery timeline. Looking forward to working together!

2. Order Delivery Message

Hi [Name]! Your project delivery is ready.

Included in your delivery files:
✔ Full unlocked source files (Spreadsheet / JavaScript widget)
✔ Step-by-step installation & embed documentation
✔ Tested formula verification audit memo

Please test the inputs and calculations on your end. If you have any questions or need minor adjustments, let me know right away—I'm here to support your rollout!

3. Review Request & Upsell Prompt

Thank you so much for the review, [Name]! It was a pleasure building this engine with you.

If you ever need additional calculation models, lead-capture integrations, or client proposal formats, feel free to reach out anytime. Best of luck with your launch!