About These Calculators
Plumbing calculators for professionals and homeowners. Size pipes, calculate water flow rates, determine water heater capacity, and plan irrigation systems.
Plumbing Calculators
13 toolsPipe Size Calculator
Calculate the right pipe diameter for water supply
Water Flow Rate Calculator
Calculate water flow rate from pipe size and pressure
Water Heater Size Calculator
Calculate the right water heater capacity for your home
Drain Slope Calculator
Calculate the correct slope for drain pipes
Water Pressure Calculator
Calculate water pressure from elevation and pipe properties
PEX Pipe Calculator
Calculate PEX pipe, fittings, and manifold connections
Toilet Water Usage Calculator
Calculate water savings from upgrading to a low-flow or dual-flush toilet
Water Softener Size Calculator
Size a water softener based on household size, water hardness, and daily usage
Septic Tank Sizing Calculator
Calculate the minimum septic tank size based on bedrooms and daily water usage
Pipe Insulation Calculator
Calculate pipe insulation material needed and energy savings for hot or cold water pipes
Sump Pump Size Calculator
Calculate the right sump pump size based on basement area, water table, and discharge height
Toilet Flush Savings Calculator
Calculate water savings from upgrading your toilet
Septic System Size Calculator
Calculate the right septic tank size for your home
Frequently Asked Questions
Are these plumbing calculators free?
Yes, all 13 calculators are completely free with no signup required. They run entirely in your browser — no data is sent to any server.
How accurate are these calculators?
Our calculators use industry-standard formulas and are regularly updated. However, they provide estimates — always verify critical calculations with a professional in the relevant field.
Can I use these calculators on my phone?
Yes, all calculators are mobile-responsive and work on any device with a web browser. No app download needed.
Do you save my calculations?
No. All calculations happen in your browser. We don't store any of your inputs or results. Your data stays on your device.
Can I embed these calculators on my website?
Select calculators offer embed codes that you can copy and paste into your website or blog. Look for the "Embed This Calculator" section on individual tool pages.