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Search and browse all 66 Forge calculators by technical discipline.

Automotive · 13 tools

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Wheel Fitment CalculatorCompare wheel widths, offsets and spacer effects.
Tyre Size CalculatorCompare tyre diameter, sidewall and speedometer change.
Gear Ratio / RPM CalculatorRelate road speed, engine RPM and drivetrain ratios.
Power-to-Weight CalculatorCalculate hp, PS and kW per tonne or reverse a target ratio.
Engine Displacement CalculatorCalculate engine capacity from bore, stroke and cylinder count.
Fuel Economy ConverterConvert UK MPG, US MPG, L/100 km and km/L.
Compression Ratio CalculatorCalculate static compression ratio from detailed engine geometry.
Mean Piston Speed CalculatorCalculate mean piston speed from engine stroke and RPM.
Brake Piston Area CalculatorCalculate hydraulic and effective brake-caliper piston area.
Brake Bias CalculatorEstimate theoretical front and rear brake torque distribution.
Injector Flow CalculatorEstimate supported horsepower or required fuel-injector flow.
Bore / Stroke Ratio CalculatorClassify engine geometry from cylinder bore and crankshaft stroke.
Oil / Fuel Mix Ratio CalculatorCalculate oil quantity for two-stroke and other fuel mixtures.

Electrical · 11 tools

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Voltage Drop CalculatorEstimate voltage loss across cable runs.
Ohm’s Law CalculatorCalculate voltage, current, resistance and power.
Battery Runtime CalculatorEstimate useful runtime from capacity and load.
LED Resistor CalculatorSize a series resistor and wattage for an LED string.
Resistors in Series & Parallel CalculatorCalculate equivalent resistance for series and parallel networks.
Wire Resistance CalculatorCalculate conductor resistance and optional voltage drop from area or AWG.
Capacitor Charge / Discharge CalculatorCalculate ideal RC capacitor voltage, charge and current over time.
RC Time Constant CalculatorCalculate RC timing and response percentages from 1τ to 5τ.
Transformer Ratio CalculatorCalculate ideal transformer voltage, turns and current ratios.
AC Power / Power Factor CalculatorCalculate single-phase apparent, real and reactive power.
Fuse Size EstimatorEstimate current requirement and the next common fuse rating.

RF · 6 tools

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Frequency & Wavelength CalculatorConvert frequency, wavelength and common wave fractions.
dBm ↔ Watts ConverterConvert RF power between dBm, milliwatts, watts and kilowatts.
Quarter-Wave Antenna CalculatorCalculate theoretical antenna lengths from RF frequency.
Free Space Path Loss CalculatorCalculate ideal RF path loss from frequency and distance.
VSWR ↔ Return Loss CalculatorConvert VSWR, return loss, reflection coefficient and mismatch loss.
Fresnel Zone CalculatorCalculate first-zone radius and RF path-clearance guidance.

Mechanical · 11 tools

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Hydraulic Cylinder Force CalculatorCalculate extension and retraction force from bore and pressure.
Pulley & Belt Ratio CalculatorCalculate belt-drive speed ratios and required pulley sizes.
Pipe Flow & Velocity CalculatorRelate pipe diameter, volumetric flow and fluid velocity.
Thermal Expansion CalculatorEstimate material length change across a temperature range.
Beam Deflection CalculatorEstimate elastic deflection for common beam and load cases.
Shaft Torsion CalculatorCalculate polar moment and torsional shear stress in circular shafts.
Belt Length CalculatorEstimate open-belt length and pulley wrap angles.
Chain / Sprocket Ratio CalculatorCalculate chain-drive ratio, output RPM and required sprocket teeth.
Spring Rate CalculatorCalculate compression coil spring rate and load deflection.
Bearing Life CalculatorEstimate basic L10 bearing life in revolutions and hours.
Bending Stress CalculatorCalculate elastic bending stress from moment and section modulus.

Fabrication · 7 tools

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Material Weight CalculatorEstimate stock weight from material and dimensions.
Bolt Circle & PCD CalculatorGenerate coordinates for evenly spaced holes on a PCD.
Bend Allowance CalculatorCalculate sheet-metal bend allowance, setback and bend deduction.
Mitre Angle CalculatorCalculate cut angles for equal and unequal-width joints.
Tube Notch / Fishmouth CalculatorEstimate tube coping depth and practical wrap-layout offsets.
Weld Consumable EstimatorEstimate simple weld volume and approximate filler mass.
Plate Area & Weight CalculatorQuickly calculate rectangular plate area, volume and mass.

Machining · 6 tools

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Tap Drill CalculatorFind tapping drills for metric, UNC and UNF threads.
Speeds & Feeds CalculatorCalculate machining RPM, feed rate, surface speed and chip load.
Drill Size ConverterMatch metric, fractional, number and letter drill sizes.
Thread Pitch / TPI ConverterConvert metric thread pitch, TPI and reciprocal pitch values.
Countersink Depth CalculatorCalculate countersink depth from hole diameters and included angle.
Taper CalculatorCalculate taper angle, length and diameter change per unit length.

3D Printing · 6 tools

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3D Print Cost CalculatorEstimate filament, energy and machine costs.
Filament Length ↔ Weight CalculatorConvert 3D-printer filament length, weight and volume.
Resin Print Cost CalculatorEstimate resin material and optional electricity cost for a print.
Layer Count CalculatorCalculate whole-layer count and resulting printed height.
Extrusion / Volumetric Flow CalculatorRelate extrusion geometry, print speed and volumetric flow.
Shrinkage Compensation CalculatorCalculate observed shrinkage and corrected print scaling.

General · 6 tools

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Engineering Unit ConverterConvert common workshop and engineering units.
Triangle SolverSolve triangle sides, angles, area and perimeter.
Circle / Arc / Chord CalculatorSolve circle, arc, chord, sagitta and sector geometry.
Tank Volume CalculatorCalculate full and partially filled tank volumes.
Slope / Gradient CalculatorConvert rise, run, angle, percentage grade and slope ratio.
Percentage Difference / Ratio CalculatorCalculate percentage comparisons and simplify ratios.