Alcohol Dilution Calculator — Water or Alcohol to Add

Calculate water or stronger alcohol to add, prepare an exact final volume, lower or raise ABV, blend two strengths, and convert U.S. proof.

Salary Calculator — Hourly to Annual Pay

Convert hourly, daily, weekly, monthly, or annual gross pay instantly. Optionally adjust schedule, unpaid time, overtime, bonus, and raise.

Square Feet Calculator — Rooms & Floor Plans

Calculate square feet for one room or a full floor plan in exact feet and inches. Add rooms by floor, subtract excluded areas, and estimate materials and cost.

Quadratic Graphing Calculator — Vertex, Roots & Steps

Type a quadratic function to graph and solve it instantly, or edit standard, vertex and root forms. Trace the parabola and see roots, vertex, domain, range and steps.

Tuckpointing Calculator — Mortar, Bags, Labor & Cost

Estimate tuckpointing and repointing from wall area or measured mortar-joint length. Calculate joint footage, mortar volume, whole bags, labor hours and cost.

Retaining Wall Calculator — Blocks, Gravel, Drainage & Cost

Estimate a segmental retaining wall from editable block geometry. Calculate courses, blocks, pallets, caps, base and drainage aggregate, pipe, fabric, excavation and cost.

Dry Well Calculator — Storage, Pit Size & Drain Time

Size or check a residential dry well from roof runoff, rainfall, storage media, pit dimensions and a measured infiltration rate. Compare storage, drain-down, excavation, fabric, modules and editable cost.

Heat Loss Calculator — Walls, Windows & Air Leakage

Estimate design heat loss through walls, windows, ceiling, floor and air leakage, with an editable BTU/h and kW breakdown.

EV Charging Calculator: Time, Cost and Home Charger Size

Calculate EV charging time, wall energy, session cost, range added, home charger size and annual savings versus gasoline.