Hydraulic engineering calculators with a professional calculation report
Calculate for free in your browser: channels, pipes, design discharges, earthworks and water hammer. And when it has to be submitted, download a calculation report ready to attach to the project — with your data, your units and your authorship.
You have the number. Not the appendix.
- The usual calculator gives you a result… and nothing you can submit. A screenshot is not a calculation report.
- The inherited spreadsheet. Every project, the same old Excel file: formulas nobody checks, mixed units, and the doubt about whether that cell is still right.
- The reviewer asks for justification. Method, assumptions, development and checks — written up, not scattered. And the deadline was yesterday.
Here the calculation and its justification come out of the same place, at the same time.
Free to calculate. A single payment when you need the document.
- Calculate for free. Complete results in your browser, with checks and configurable units (SI and US customary, per field or by preference). No sign-up.
- Review and adjust. Add your project, your context and the source of each input.
- Download the report. A professional PDF, delivered immediately, for a single payment. No subscription, no account, no data retained.
A report you will not be embarrassed to attach
It is not a dump of results: it is the document you would write yourself with time to spare.
- Written the way an engineer would write it. Introduction, analysis and conclusions that relate your results — rather than repeating them in paragraphs.
- Textbook development. Formulas, substituted values and results, with the assumptions of the method stated.
- Your units throughout the document, the same ones you work with.
- Inputs with their source. Each input states where it comes from — the survey, the manufacturer's catalogue, your own judgement.
- Checks with a verdict. What is satisfied and what is not, in the terms of each criterion.
- Charts where they help: the channel cross-section, the mass haul diagram, the pressure envelopes over the pipeline profile.
- Your name and your responsibility. The document is issued under your authorship, as an appendix to your project.
Look at a sample report before paying anything.
Calculators
Channels — Manning equation
Normal flow depth, section capacity and optimal section, with flow regime, Froude number and freeboard checked.
- normal flow depth
- capacity
- optimal section
Pressure pipes
Friction and minor head losses, required diameter or available discharge in pressure pipelines.
- head loss
- diameter
- discharge
Design discharge — rational method
Time of concentration, intensity from IDF curves and a weighted runoff coefficient for the peak discharge of your catchment.
- tc
- IDF
- weighted C
Earthwork volumes
Volumes by the average end area method, bulking and shrinkage factors, mass haul diagram and progress measurements.
- volumes
- mass haul diagram
- progress measurement
Water hammer
Pump trip or valve closure: wave speed, surge by Joukowsky or Michaud and pressure envelopes over the profile.
- pump trip
- valve closure
- envelopes
Textbook methods, results you can reproduce
- Classical formulas from the reference literature, with the development in plain view: no black boxes.
- Your data lives in your browser and in the files you export. There are no accounts and we do not store your calculations: the report includes your data, so that anyone can reproduce it.
Frequently asked questions
How much does it cost?
Calculating is free, with no sign-up and no limit. The calculation report is a single payment per document (depending on the calculator). No subscription.
What does the report include?
Project details and authorship on the first page, inputs with their sources, the assumptions of the method, the development of the calculation with formulas and substituted values, results, checks with a verdict, charts where the calculation calls for them, and the technical prose of the introduction, analysis and conclusions.
How is the prose of the report written?
With the assistance of artificial intelligence, based exclusively on your inputs and results: the figures are copied from the calculation, never recalculated or invented. The document is issued under your review and professional responsibility, as its final note states.
Do I need to create an account?
No. Nor do we store your calculations: the report includes all your inputs, and in earthwork volumes you can export and import them as CSV.
Which units does it work in?
SI and US customary, configurable per field and by preference. The report comes out in your units; the development of the calculation, in SI with its conversion line.