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.

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.

Water Volume Calculator — Area, Depth & Gallons

Calculate US gallons from square feet and water depth, then plan pools, ponds, tanks, materials and volume conversions with editable examples.

Grade Calculator — Weighted Grades, Final Exam & GPA

Calculate weighted course grades, final exam targets, semester and cumulative GPA, or the GPA needed to reach a goal.

Age Calculator — Exact Age, Days & Next Birthday

Calculate exact calendar age in years, months and days, total elapsed days, hours and minutes, age on any date, and the next birthday.

Candle Wax Calculator

Plan mixed candle sizes, weigh wax and fragrance, and work out complete batches from your ingredient stock.

Circle Skirt Calculator — Pattern & Fabric

Draft quarter to double-circle skirts with seam allowances, a waistband and fabric layout. Print an actual-size panel on A4 or Letter paper.

Continuous Bias Binding Calculator

Plan continuous bias tape from a fabric square. See full-width bands, discarded fabric and the square needed for your required length.

Diagonal Quilt Backing Calculator

Plan a diagonal quilt backing with a rounded cut length, illustrated slide and seam, straight-panel comparison and printable cutting plan.

Fabric Yardage & Cut Layout Calculator

Lay out rectangular fabric pieces with grain controls. Calculate yardage to buy, check an existing cut and print your cutting worksheet.

Free Date Calculator — Days Between Dates & Age Calculator

Calculate days between dates, add or subtract days, or find an exact age with weekend controls, clear steps, and instant visual results.

Pool Salt Calculator

Work out how much pool salt to weigh, how many bags to buy and what remains. Preview salt levels and compare high-salt readings.