Engineering Tools Built for Real Work
Calculate, check, compare, document, and report engineering work in one place.
Build across engineering disciplines
Workflows, tools, and knowledge organized around real engineering practice — not a list of isolated calculators.
Concrete, rebar, quantity, and site work
14 live tools across concrete, rebar, estimation, earthwork, and site engineering.
- Concrete Engineering
- Rebar & Reinforcement
- Masonry & Blockwork
- Earthwork & Excavation
- Stormwater & Drainage
- Cost & Quantity Estimation
- Site Management Tools
- Sustainability & Carbon
RO, water quality, hydraulics, and treatment
27 live tools across reverse osmosis, desalination, water treatment, and hydraulics.
- Reverse Osmosis (RO)
- Desalination Systems
- Water Treatment
- Water Quality & Chemistry
- Hydraulics & Pumping
- Water Resources & Hydrology
Follow a flow, not just a formula
Guided paths connect real calculation outputs into multi-step engineering workflows.
RO System Analysis
Follow a membrane system from feedwater to design review, one calculation at a time.
- Feedwater Define feed source and quality
- 1 Recovery Permeate vs concentrate flow
- 2 Mass Balance Salt and flow balance across membranes
- 3 Permeate / Concentrate Quality and concentrate load
- 4 Osmotic Pressure Net driving pressure check
- 5 Scaling Risk LSI / S&DSI tendency
- 6 Design Review Explore staged design scenarios
Concrete Engineering Workflow
From structure inputs to material quantities and site documentation.
- Project Input Element type and dimensions
- 1 Volume Concrete quantity in place
- 2 Mix / Quantity Mix proportions and materials
- 3 Rebar Reinforcement weight per meter
- 4 Material Quantities Takeoff and ordering quantities
- Site Documentation Site-ready sheet for the crew
Hydraulics System Design
From flow requirement to sized line, checks, total dynamic head and pump power — one workflow.
- 1 System Design Run the full flow-to-pump-power workflow
- 2 Pipe Sizing Required diameter from flow and velocity
- 3 Pipe Flow Velocity and Hazen–Williams friction
- 4 Reynolds Number Flow regime check
- 5 Darcy–Weisbach Friction head loss (primary method)
- 6 Pump Head Total dynamic head
- 7 Pump Power Hydraulic, shaft and motor power
Learn alongside the tools
Guides, concepts, equipment references, manufacturers, projects, and technical resources.
Keep your calculations, projects, and reports connected
Save calculations, organize projects, reuse inputs, and prepare site-ready sheets — a connected workspace for how engineers actually work.
- ✓ Save calculations
- ✓ Organize projects
- ✓ Reuse inputs
- ✓ Connect calculations
- ✓ Track revisions
- ✓ Prepare site-ready sheets
- RO Scaling Risk & Pretreatment→
Saved calculation · can reopen inputs
- Concrete Volume & Pre-Mix Quantities→
Saved calculation · can reload inputs
- Site-Ready Field Sheet→
Print / WhatsApp / CSV from any calculation
EngiMetric Engineering Copilot
AI-assisted engineering interpretation, grounded in your calculations and project context.
Intelligence is under construction as an optional layer. Every calculation continues to run fully in-browser, without any AI dependency.
EngiMetric Pro
Keep more projects and scale your practice — powered by the same verified engines you already use.
More Projects
More than one engineering project at a time on the PRO plan.
Engineering Reports
Draft structured reports from your saved calculation data.
Calculation Chains
Connect tools with declared, unit-checked result mappings.
Exports & Templates
CSV and Markdown exports ready for engineering practice.
Report drafting, calculation chains, and exports already work free in your browser workspace. On the free plan you keep one project at a time; PRO unlocks more projects and future cross-device continuity. No billing setup is available on this site yet.
Free calculator access remains permanently open.
A few tools to start with
RO Recovery Calculator
Calculate RO permeate and concentrate flow from feed flow and system recovery rate.
Open tool → WaterRO Salt Rejection Calculator
Calculate membrane salt rejection percentage from feed and permeate TDS concentrations.
Open tool → WaterRO Permeate TDS Calculator
Project expected permeate total dissolved solids based on feed water salinity and rejection specs.
Open tool → WaterRO Concentrate Flow Calculator
Compute brine/reject flow rates and volumetric stream balances for disposal or ZLD design.
Open tool → WaterRO Osmotic Pressure Calculator
Estimate RO feed osmotic pressure using a simplified van’t Hoff model from TDS, temperature, and solute properties.
Open tool → WaterRO Mass Balance Calculator
Simplified TDS-based dissolved-solids balance for RO feed, permeate, and concentrate flow and quality checks.
Open tool →Start your next engineering calculation
Transparent formulas, verified engines, and tools built around real engineering work — free to use, designed for the field.
This calculator provides preliminary engineering estimates for informational and planning purposes. Actual reverse osmosis / engineering system performance depends on site conditions, feed-water chemistry, membrane characteristics, operating pressure, temperature, recovery limits, fouling/scaling potential, and system design. Verify results using project-specific data, manufacturer projections, and applicable engineering standards before final design or operation.