Calculator cluster

Plumbing & Fluid Calculators

Connect actual pipe bore and flow with water friction, pump total dynamic head and drainage gradients using explicit assumptions and unit conversions.

4 calculators in this cluster

Fluid continuity relates volumetric flow to the open cross-section and mean velocity. A calculated inside diameter helps compare real pipe bores without confusing them with nominal trade sizes.

Drainage geometry uses horizontal run and vertical fall to express the same gradient in several useful units. Pressure loss, partial filling and local plumbing rules require separate application-specific checks.

A practical calculation workflow

Step 1

Resolve flow and bore

Choose flow, inside diameter or mean velocity as the missing variable.

Open Pipe Diameter

Step 2

Estimate water friction

Compare straight-pipe friction or reverse an allowable loss to flow and bore.

Open Hazen-Williams

Step 3

Build the pump head balance

Combine elevation, boundary pressure, straight-run friction and fittings at a design flow.

Open Pump TDH

Step 4

Check drainage geometry

Keep horizontal run, fall and ending elevation separate from pressure-pipe sizing.

Open Drainage Slope

All Plumbing & Fluid calculators

Choose the variable you know and the quantity you need to solve. Each tool shows its formula, default worked example, and nearby calculations.

Pipe Diameter Calculator

Solve pipe inside diameter, flow or mean velocity from Q = A × v. Convert L/s, L/min, m³/h, US GPM, CFM and metric or imperial pipe dimensions.

Drainage Slope Calculator

Calculate drainage slope, fall, run or ending elevation. Compare percent, 1:X, mm/m, cm/m, in/ft and degrees with a run-and-fall diagram.

Hazen-Williams Calculator

Solve water-pipe friction head loss, pressure loss, flow or inside diameter using Hazen-Williams with editable C-factor and metric or imperial units.

Pump TDH Calculator

Estimate pump total dynamic head, pipe and fitting losses, pressure head and hydraulic power with editable fluid properties and metric or imperial units.

Practical notes