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CivilCalc Engineering Tool

Sewer Pipe Sizing Calculator

Estimate design wastewater flow and select a preliminary gravity sewer diameter from population and hydraulic criteria.

Formula / Method

Qdesign = Qavg × Peak Factor + Additional Flow

Quick Example

You can enter a design population directly or project a current population to a target year.

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Enter your project values below and calculate instantly in your browser.

CivilCalc
Fast • Mobile • Engineering Calculations
Civil & Infrastructure Engineering

Fast engineering calculations, all in one place.

Mobile-friendly tools for infrastructure and superstructure engineering. Pipe slope, stormwater, sewer sizing, hydraulics, pipe sizing and construction quantity calculations in one platform.

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10 toolsRuns in your browser • No installation • Mobile friendly

Calculation Tools

Choose a category first, then open the calculation tool you need.

Cost Calculators

Quantity takeoff, unit price and cost estimate tools will be added here.

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This section is reserved for the next development phase.

Stormwater Runoff Calculator

Calculates peak runoff using the Rational Method.

Sewer Sizing Calculator

Enter the design population directly or project it to a target year; then calculate wastewater flow and a preliminary sewer pipe diameter.

Default per-capita flow, peak factor, minimum diameter, depth ratio and velocity criteria can be changed by the user. Final design must follow the relevant authority requirements and project criteria.

Hydraulics

Uses Manning's equation to calculate full-flow capacity or actual partial-flow conditions for a given inflow.

Pipe Sizing

Selects the first suitable standard pipe diameter based on design flow, slope and pipe material.

Concrete Calculator

Calculates net concrete volume and order quantity including waste for foundations, slabs, columns, beams and walls.

Rebar Weight Calculator

Fill in the first rebar row; use Add Row to enter additional diameters or bar lengths.

Formwork Calculator

Calculates approximate formwork area for foundations, columns, beams, walls and slabs.

Masonry Calculator

Calculates masonry area, volume and approximate unit quantity.

Pipe Slope

Calculates pipe slope from upstream and downstream invert elevations.

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How It Works

CivilCalc calculations run in your browser; engineering inputs are not sent to a server in this version.

1. Enter Data

Enter project data such as elevations, distance, area, rainfall intensity, population, wastewater assumptions, diameter, slope and pipe material.

2. Calculate

Calculate results quickly using common engineering methods such as the Rational Method and Manning equation.

3. Review

Review results together with project criteria, authority specifications and applicable technical standards.

About CivilCalc

CivilCalc is a mobile-first engineering calculation platform designed to make common infrastructure and superstructure calculations faster in the field and office.

Infrastructure tools include pipe slope, stormwater runoff, preliminary sewer sizing, hydraulic calculations and pipe diameter selection. Superstructure tools include concrete, multi-row rebar, formwork and masonry calculations.

Results are intended for preliminary sizing and checking. Final design decisions must follow applicable standards, authority specifications and engineering judgement.

Privacy Policy

Last updated: 24 August 2026

CivilCalc is a free web application for infrastructure and superstructure engineering calculations. This policy explains how data may be processed on civilcalc.net.

1. Calculation data

Engineering inputs entered into the calculators are used to perform calculations. In this version, these inputs are not linked to a CivilCalc user account and are not stored to build user profiles.

2. Google Analytics

CivilCalc uses Google Analytics 4 to understand site usage and improve the service. It may process page views, device information, approximate location, traffic source and events related to use of CivilCalc tools.

3. Google AdSense and advertising cookies

CivilCalc may use Google AdSense for advertising and measurement. Google and its advertising partners may use cookies or similar technologies. Where required, users may be shown consent choices through Google's consent management platform.

4. Cookies and preferences

You can manage or delete cookies through your browser settings. Disabling cookies may affect analytics or advertising features.

5. Third-party services

Google Analytics and Google AdSense are third-party services and their processing is subject to their own privacy policies.

6. Contact

For privacy questions, contact contact@civilcalc.net.

Contact

For questions, bug reports and feature requests:

contact@civilcalc.net

For advertising and partnerships:

ads@civilcalc.net

Website: civilcalc.net