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

Estimate EV charging time and wall energy from your battery, charge window and real power limits. Add your own electricity rate, range and home refill needs only when useful.