Free Home-Improvement Tools, Calculators & Charts
Free Tools, Calculators & Reference Charts
Plan any home-improvement project with our free calculators and trade reference charts — then shop the tools and parts to get it done, with fast US shipping.
Calculators
Paint CalculatorHow much paint for a roomTile CalculatorTiles needed + wasteLumens CalculatorHow bright a light you needWire Gauge CalculatorAWG for your amperageConcrete CalculatorBags & cubic yardsBoard Foot CalculatorLumber board feet & costCeiling Fan Size CalculatorBlade span for your roomVoltage Drop CalculatorCheck long wire runsMERV FinderRight air filter ratingBulb Brightness CalculatorWatts to lumens
Reference charts
Wire Gauge / AWG ChartAWG to amps, breaker & useDrill Bit Size ChartFraction, decimal & mmTap & Drill Size ChartCorrect tap drill bitWood Screw Size ChartGauge, diameter & pilotLumber Size ChartNominal vs actualLight Bulb Base TypesE26, E12, GU10 & moreSocket Size ChartSAE to metricNPT Pipe Thread ChartTPI & outside diameterColor Temperature ChartKelvin guideMERV Rating ChartAir filter comparisonHex / Allen Key ChartSAE & metricSandpaper Grit ChartWhich grit to use
Buying & how-to guides
Hardwired vs Plug-In Under-Cabinet LightingCobalt vs Titanium vs HSS Drill BitsHow to Choose Soft-Close Cabinet HingesMERV Rating GuideLumens vs Watts (LED Guide)Light Color Temperature GuideHow to Choose a Cordless DrillDeadbolt Grades ExplainedWire Gauge Guide (AWG to Amps)Shower Head GPM GuideIP Rating Guide (IP65 vs IP67)How to Choose Work GlovesDusk-to-Dawn vs Motion Sensor LightsFixture Finishes ComparedExtension Cord Gauge GuideTop Cordless Drill Brands Compared