Tested
Friction Loss Calculator
Pipe friction head loss with the Hazen–Williams equation.
Engineering Calculators
Use CalculatorEngineering Calculators
Free engineering calculators for everyday questions, from quick checks to detailed breakdowns.
Engineering tools (4)
- Tested
Gallons per Minute Calculator
Flow in gallons per minute from pipe size and velocity, or volume and time.
Engineering Calculators
Use Calculator - Tested
Pipe Pressure Drop Calculator
Pressure drop in a straight pipe from the Darcy–Weisbach equation.
Engineering Calculators
Use Calculator - Tested
Pump Flow Calculator
Pump output from displacement, speed and volumetric efficiency.
Engineering Calculators
Use Calculator
All engineering calculators by topic (37)
Automotive
Circuits
Components
Electrical
Fasteners
General
Hydraulics
Mechanical
Rotation
Shipping
Vehicles
About engineering calculators
Engineering Calculators help you turn a question into a clear, checkable answer. Each tool lists its inputs, shows the formula it relies on and explains how to read the result.
Browse by topic using the filters, or search for a specific tool. Tools that are still being built are clearly marked as previews and are not presented as finished calculators.
Frequently asked questions
Are the engineering calculators calculators free?
Yes. Every calculator on Calculator Atlas is free to use and requires no sign-up.
How are results verified?
A calculator is only published after its formula has been implemented, tested against independently computed reference values. It is an automated check, not a professional review.