Calculator collections

Tools grouped around real tasks.

Instead of browsing by category alone, start with the job you are trying to finish and move through a curated set of related calculators.

Home Project Calculators

Free calculators for paint, flooring, concrete, tile, drywall, roofing, gravel, mulch and other home-project quantities.

Profit margin, markup, break-even, pricing, ROI, customer value and other free calculators for everyday business decisions.

Convert hourly pay, salary, overtime, weekly pay, project rates and work hours with free NumLuma calculators.

Free calculators for loan payments, mortgages, compound interest, savings growth, debt payoff, future value and more.

Calculate percentages, discounts, percentage change, tips, unit prices and bill splits with clear formulas and instant results.

Convert length, weight, temperature, area, volume, speed, pressure, energy, power, data and other common units.

Free CPC, CPM, CTR, CPA, ROAS, CAC and conversion calculators for paid-media and acquisition analysis.

Free construction calculators for concrete, square footage, cubic yards, gravel, drywall, roofing, pavers, board feet and material waste.

Free ecommerce calculators for margin, markup, product pricing, AOV, conversion rate, CAC, customer lifetime value, sales growth and revenue goals.

Free freelance calculators for hourly rates, project pricing, billable hours, work hours, salary comparisons, pay raises and income conversions.

Free calculators for compound interest, savings growth, CAGR, future value, present value, doubling time, savings goals and emergency funds.

Free date and time calculators for age, date differences, days until a date, time duration, work hours, time cards and unit conversion.

Free math calculators for percentages, averages, ratios, proportions, fractions, decimals, GCD, LCM, square roots and exponents.