One page. One job. Done.
Complete ToolPatch tools directory
ToolPatch is a growing collection of focused utilities and practical workflow toolkits. Each page handles one task with clear inputs, fast results, and usable outputs.
Toolkits for common workflows
Start with a workflow when the job spans several small tools, assumptions, or handoff steps.
Startup Unit Economics Toolkit
Build, stress-test, and communicate your core economics in one workflow.
Network Troubleshooting Toolkit
Diagnose addressing, DNS, and transport bottlenecks quickly.
Lab and Chemistry Calculations Toolkit
Plan solution preparation, dilution, gas-law, reaction-yield, and pH checks with visible chemistry assumptions.
Project Delivery Planning Toolkit
Forecast schedule and delivery risk using practical PM metrics.
Engineering Field Calcs Toolkit
Fast first-pass engineering calculations for site and workshop decisions.
Chart Generators Toolkit
Choose the right chart generator for radar, spider, radial, Gantt, Sankey, bubble, Pareto, funnel, waterfall, trend, comparison, and distribution views.
Marine Navigation Calculators Toolkit
Use practical marine navigation calculators for CPA/TCPA, under-keel clearance, tide windows, route distance, set and drift, fuel range, ETA, anchoring, COLREGs encounter checks, and vessel turning estimates.
Browse by Use Case
Quick filters
Recent Tools
No recent tools yet.
Favorite Tools
Mark tools as favorites to pin them here.
Tool directory
Browse every matching canonical tool page.
Engineering & Power
Featured
Gauge + Barometric to Absolute Pressure Calculator
Convert gauge and barometric pressure to absolute pressure.
Calculate absolute pressure from gauge and barometric readings: P_abs = P_gauge + P_barometric.
Engineering & Power
Featured
Vertical Cylindrical Tank Contents Calculator
Calculate liquid volume in vertical cylindrical tanks.
Compute liquid volume from height in vertical cylindrical tanks using V = πr²h. Perfect for water tanks and storage vessels.
Engineering & Power
Battery Bank Capacity Calculator
Calculate required usable and total battery capacity.
Calculate battery bank size in kWh and Ah based on autonomy days, voltage, and depth of discharge.
Engineering & Power
Beam Deflection Calculator
Estimate max deflection for a simply-supported beam with center load.
Uses classic formula delta = PL^3/(48EI) for quick structural checks.
Engineering & Power
Charge Controller Sizing Calculator
Size MPPT or PWM charge controllers for safe operation.
Calculate required controller current (Amps) based on PV power and battery voltage with safety margins.
Engineering & Power
Electrical Power Calculator
Solve power, voltage, or current from P = V * I.
Convenient electrical triangle calculator for circuits and load estimates.
Engineering & Power
Fluid Depth, Density, Gravity & Pressure Calculator
Solve for any variable in the hydrostatic equation P = ρgh.
Universal hydrostatic calculator. Enter any 3 values (depth, density, gravity, pressure) to solve for the 4th using P = ρgh.
Engineering & Power
Horizontal Cylindrical Tank Contents Calculator
Calculate liquid volume in horizontal cylindrical tanks.
Determine liquid volume from depth in horizontal cylindrical tanks using circular segment geometry. Essential for fuel storage and process tanks.
Engineering & Power
Inverter Sizing Calculator
Determine recommended inverter continuous and surge ratings.
Size your inverter based on simultaneous continuous loads and peak motor starting surges.
Engineering & Power
Liquid Level to Hydrostatic Pressure Calculator
Calculate hydrostatic pressure from liquid level.
Convert liquid level to pressure using P = ρgh. Essential for tank pressure calculations and sensor calibration.
Engineering & Power
Pressure to Liquid Level Calculator
Calculate liquid level from pressure measurement.
Convert pressure readings to liquid level height using hydrostatic formula h = P/(ρg). Useful for tank level monitoring and process control.
Engineering & Power
PV Stringing Helper
Analyze series and parallel solar panel configurations.
Optimize panel stringing based on Voc, Vmp, temperature coefficients, and MPPT voltage limits.
Engineering & Power
Rectangular Tank Contents Calculator
Calculate liquid volume in rectangular tanks.
Determine liquid volume in rectangular tanks from dimensions using V = l × w × h. Ideal for aquariums, pools, and industrial vessels.
Engineering & Power
Reynolds Number Calculator
Estimate fluid flow regime using Reynolds number.
Classifies laminar, transitional, and turbulent flow from fluid properties.
Engineering & Power
Safety Factor Calculator
Calculate safety factor from material strength and working stress.
Estimate design safety margin by comparing allowable strength against expected load stress. Useful for preliminary design checks and engineering documentation.
Engineering & Power
Solar Array Size Calculator
Calculate required PV array size and panel count.
Determine the required DC solar capacity based on daily energy usage, peak sun hours, and system efficiency.
Engineering & Power
Solar Charge Time Estimator
Estimate hours to reach target battery state of charge.
Predict the time required to recharge batteries based on present SOC, target SOC, and available charge power.
Engineering & Power
Specific Impulse (Isp) Calculator
Calculate Specific Impulse (Isp) for rocket engines.
Specific impulse (Isp) is a measure of how efficiently a rocket engine uses its propellant. Calculate it using thrust and mass flow rate, or total impulse and propellant mass.
Engineering & Power
Thermal Expansion Calculator
Calculate linear expansion from alpha, temperature change, and length.
Useful for materials, piping, and tolerance planning under temperature shifts.
Engineering & Power
Torque Calculator
Calculate torque from force, lever arm, and angle.
Uses tau = F * r * sin(theta) for quick mechanical calculations.
Engineering & Power
Voltage Divider Calculator
Compute output voltage for two-resistor divider circuits.
Useful for quick analog design checks and electronics prototyping.