🔧 Professional Plumbing Tools & Guides

Free online calculators, diagnostic tools, and comprehensive guides for plumbers, homeowners, and DIY enthusiasts. Calculate pipe dimensions, water pressure, BTU requirements, and more.

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🧮 Popular Plumbing Calculators

Quick and accurate calculators for all your plumbing needs

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Pipe Diameter Calculator

Calculate optimal pipe diameter based on flow rate and velocity requirements.

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Water Pressure Calculator

Determine water pressure at different elevations and pipe configurations.

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BTU Calculator

Calculate heating BTU requirements for accurate system sizing.

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Slope Calculator

Calculate proper drainage slope for compliant installations.

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GPM Calculator

Calculate gallons per minute based on pipe size and pressure.

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Water Heater Size Calculator

Find the perfect water heater size for your household needs.

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⚡ Why Choose PlumbingToolHub?

Everything you need for accurate plumbing calculations and professional guidance

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Accurate Results

Our calculators use industry-standard formulas and are regularly verified by professional plumbers.

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Mobile Friendly

Access all tools and guides from any device - desktop, tablet, or smartphone.

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Completely Free

No subscriptions, no fees, no limits. All tools and guides are 100% free forever.

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Expert Written

All guides are written by licensed plumbers with decades of hands-on experience.

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Easy Conversions

Instant unit conversions for metric and imperial measurements.

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Code Compliant

All recommendations follow current plumbing codes and best practices.

📚 Latest Plumbing Guides

In-depth articles written by plumbing professionals

Plumbing basics

Complete Guide to Plumbing Basics

Learn the fundamental concepts of residential plumbing systems, including water supply, drainage, and venting.

By Mike Johnson • March 15, 2026
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Pipe installation

Mastering Pipe Installation Techniques

Step-by-step instructions for installing copper, PVC, and PEX piping in residential applications.

By Sarah Chen • March 12, 2026
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Water heater

Water Heater Installation & Maintenance

Everything you need to know about selecting, installing, and maintaining your water heater.

By David Martinez • March 8, 2026
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🛠️ Tool Categories

Find the right calculator for your specific plumbing needs

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Pipe Tools

Diameter, volume, flow rate, and length calculators for all pipe types.

6 Calculators →
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Water Tools

Pressure, GPM, and head loss calculations for water systems.

4 Calculators →
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Heating Tools

BTU, heat loss, and radiator sizing calculations.

3 Calculators →
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Drainage Tools

Slope, drain sizing, and fixture count calculators.

3 Calculators →
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Tank Tools

Water heater and tank capacity calculators.

2 Calculators →
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Conversion Tools

Unit converters for pressure, temperature, and pipe sizes.

3 Calculators →