Kalkmi online calculators
Calculate VAT, loans, mortgages, health metrics, car costs, renovation materials, and everyday figures directly in your browser.
Calculator categories
Start with a topic and jump into a ready-made calculator with examples, formulas, and a shareable page.
Popular calculators
Choose a calculator and get the result immediately. Each page is optimized for search demand and opens at a permanent URL.
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.
Area Calculator — Square Feet, Shapes, Rooms & Land
Calculate square footage for shapes, rooms, walls, roofs, and irregular land; include cutouts, waste, packages, cost, formulas, and diagrams.
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 — Wall, Mortar, Pallets & Cost
Estimate brick or concrete block walls with doors and windows. Calculate courses, units, waste, pallets, mortar bags, edge cuts, and material cost.
Tile Calculator — Layout, Boxes, Grout & Cost
Estimate floor, wall, shower, or backsplash tile. Calculate rows, columns, cuts, waste, boxes, purchased coverage, grout, spare tiles, and material cost.
Paint Calculator — Gallons, Liters, Cans & Cost
Estimate paint for rooms, walls, and ceilings. Subtract doors and windows, set coats and coverage, and see gallons or liters, cans, leftover paint, and cost.
Alcohol Dilution Calculator — Blend ABV & Convert Proof
Dilute alcohol with water, blend two strengths, plan a target batch, or convert ABV and U.S. proof with formulas, tables, and a visual mixture breakdown.
Quadratic Equation Calculator — Roots, Steps & Graph
Solve quadratic equations in standard or vertex form, or build one from roots. See real or complex roots, discriminant, vertex, steps, forms, points, and a graph.
Discount Calculator — Percent Off, Coupons & Tax
Calculate checkout totals with stacked discounts, fixed coupons, quantity, tax, and shipping; find percent off, reverse an original price, or compare two deals.
What is available now
The catalog covers high-demand calculators for finance, health, cars, construction, everyday math, and multilingual SEO pages. New calculators can be added as permanent pages.
