PureBuild is a collection of free, deterministic calculators designed for startup founders and builders. Our tools help you make data-driven decisions about equity, dilution, runway, unit economics, and more.

Are PureBuild tools really free?

Yes, all PureBuild tools are completely free to use. No sign-up required, no hidden fees, no premium tiers. We believe essential business calculations should be accessible to everyone.

Do I need to create an account?

No. All PureBuild tools work without any sign-up or registration. Your data stays in your browser and is never sent to our servers.

What tools does PureBuild offer?

PureBuild offers 9+ specialized calculators including: Equity Calculator, Dilution Simulator, Runway Calculator, Unit Economics Modeler, Payment Gateway Fee Calculator, API Token Cost Estimator, Database Capacity Planner, Viral Coefficient Calculator, and True Hourly Rate Calculator.

What is a strike price for stock options?

The strike price (or exercise price) is the fixed price at which you can purchase company shares. Your net profit is the difference between the share value at exit and your strike price.

How does dilution affect my equity percentage?

When a company raises funding and issues new shares, your ownership percentage decreases even if your share count stays the same. Use our Dilution Simulator to model this.

Is this equity calculator free to use?

Yes, this equity calculator is completely free. No sign-up required, and your data never leaves your browser.

What is a strike price for stock options?

The strike price (or exercise price) is the fixed price at which you can purchase company shares. Your net profit is the difference between the share value at exit and your strike price.

How does dilution affect my equity percentage?

When a company raises funding and issues new shares, your ownership percentage decreases even if your share count stays the same. Use our Dilution Simulator to model this.

Is this equity calculator free to use?

Yes, this equity calculator is completely free. No sign-up required, and your data never leaves your browser.

Startup Equity Calculator: Calculate Option Value & Exit Scenarios

PUREBUILD EQ-2000

COMPANY VALUATIONINPUT MODE

PROGRESS0/3 REQUIRED

Select a field to edit

50,000+ calculations

Last updated: 2025-01

Dilution Simulator

Model equity dilution across rounds

Runway Calculator

Track burn rate and forecast runway

True Hourly Rate

Find your real hourly compensation

Learn the Math

→ The Math Behind Startup Equity → Understanding Dilution Logic

Pro tip: All calculations run in your browser. Your data never leaves your machine. Use keyboard shortcuts for faster input.

Frequently Asked Questions

Your equity value equals (Your Shares ÷ Total Shares) × Company Valuation. For stock options, subtract your strike price multiplied by your share count from the gross value.

Was this helpful?

0% found helpful

Related Tools

Dilution Simulator

Runway Calculator

True Hourly Rate

Frequently Asked Questions