Kalkmi online calculators
Calculate VAT, loans, mortgages, health metrics, car costs, renovation materials, and everyday figures directly in your browser.
Your calculators
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.
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.
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.
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.
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.
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.
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.
