Free Online Calculators
Finance, math, health, construction, and everyday tools in one searchable catalog.
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Alcohol Dilution Calculator — Water or Alcohol to Add
Square Feet Calculator — Rooms & Floor Plans
Tuckpointing Calculator — Mortar, Bags, Labor & Cost
Quadratic Graphing Calculator — Vertex, Roots & Steps
Water Volume Calculator — Area, Depth & Gallons
Heat Loss Calculator — Walls, Windows & Air Leakage
EV Charging Calculator: Time, Cost and Home Charger Size
Rainwater Harvesting Calculator — Tank Size & Daily Balance
VAT Calculator — Add, Remove & Find VAT
Wallpaper Calculator — Rolls, Pattern Repeat & Cost
Brick & Block Calculator — Units, Pallets & Mortar
Tile Layout Calculator — Square Feet, Edge Cuts & Boxes
New calculators
Calculator descriptions
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.
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.
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.
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.
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.
Rainwater Harvesting Calculator — Tank Size & Daily Balance
Compare rainwater tanks using a storm and dry spell or your daily rainfall data. See water supplied, shortages, overflow and the reserve left each day.
VAT Calculator — Add, Remove & Find VAT
Add VAT to a net price, remove VAT from a gross total, or find the effective VAT rate with currencies, rounding, formulas, and a clear tax breakdown.
Wallpaper Calculator — Rolls, Pattern Repeat & Cost
Estimate wallpaper rolls for rooms or separate walls. Account for strip rounding, trim, straight or half-drop repeat, reserve, reusable offcuts, leftover length, and cost.
Brick & Block Calculator — Units, Pallets & Mortar
Estimate new brick, breeze-block and glass-block walls. Calculate courses, edge cuts, whole units, pallets, installation mortar and material cost.
Tile Layout Calculator — Square Feet, Edge Cuts & Boxes
Compare centered tile layouts and both orientations, then calculate square footage, edge cuts, tiles, boxes, waste, grout and cost.
