Calculators built for the U.S.
Free, no sign-up, built for the U.S. market. For everyday life, home projects, finances, and more.
Categories
Calculators organized by category. We're starting with Home Improvement — more categories coming soon.
Construction
Free calculators for material quantities, project costs, and job estimates — from concrete and framing to paint and flooring, built for US units and pricing.
Health
Em breve.
Finance
Free calculators for loan payments, interest, savings, and credit — with clear formulas and plain explanations so you can decide with confidence.
Conversions
Ferramentas gratuitas para converter datas, percentagens e unidades em segundos. Em português europeu, sem anúncios a atrapalhar o resultado.
Everyday life
Ferramentas gratuitas para dividir contas, planear mudanças e decidir compras do dia-a-dia. Em português europeu, para as contas que ninguém te ensinou a fazer.
Cooking
Ferramentas gratuitas para converter medidas, ajustar porções e acertar tempos de cozedura. Em português europeu, para cozinhares sem complicações.
Ecology
Ferramentas gratuitas para calcular pegada de carbono, poupança de água e energia em casa. Em português europeu, com números claros, sem marketing verde.
Math
Ferramentas gratuitas para calcular áreas, volumes, equações e estatística. Em português europeu, com a fórmula sempre à vista, passo a passo.
Study
Ferramentas gratuitas para calcular médias, notas necessárias e créditos ECTS. Em português europeu, ajustadas ao sistema de ensino português.
Popular calculators
The ones visitors use most.
Paint for walls
Calculate gallons of paint needed for your room. Accounts for coverage rate, number of coats, and safety margin for touch-ups.
Concrete Bags Calculator
Calculates the number of concrete bags required for your project based on volume and mix ratio. Includes 5% safety margin for waste.
Tile Quantity Calculator
Calculate the exact number of tiles needed for your wall or floor, accounting for waste and grout lines based on layout pattern.
Brick quantity calculator
Calculate how many bricks you need for a wall, accounting for mortar joints and waste margin.
Painting Cost Calculator
Estimate the total cost to paint your house — walls, ceilings, labor and materials. Includes regional pricing and quality tiers.
Roof area
Calculate the real sloped roof area from plan dimensions and pitch angle. For ordering shingles and roofing materials.
Building cost per sq ft
Estimate total construction costs in the US per square foot for new builds, complete renovations, or interior remodels with regional cost adjustments.
Flooring cost
Estimate the total cost of solid wood, engineered wood, laminate, or parquet flooring per square foot, accounting for material, installation, and waste.
Waterproofing cost
Estimate waterproofing costs for decks, basements, and pools across four system types. Compare material costs and labor for informed budgeting.