Numbers,made clear.
Fast, transparent calculators for the decisions that happen every day — money, work, projects, business, math and measurement.
Not another page full of tiny boxes.
NumLuma turns calculation into a clear product experience: enter the values, see the relationship, understand the answer, then move to the next useful tool.
How NumLuma works ↗Calculate. Understand.
Compare. Decide.
A calculator should not stop at the answer. NumLuma turns a number into context, alternatives and a clear next step.
Fast local calculation with the formula visible.
Breakdowns, assumptions and Show the Math.
Use A/B comparisons instead of recalculating blindly.
Save, share and continue through connected tools.
One number.
More clarity.
NumLuma is designed to reveal what changes, what matters and what to do next — without turning the page into a spreadsheet.
Seven worlds.
One language of numbers.
Home
Plan common home projects, materials and quantities.
Business
Understand pricing, profitability, marketing and growth metrics.
Work
Convert pay, hours, schedules and freelance targets.
Money
Explore straightforward interest, loans, savings and debt math.
Everyday
Solve percentages, dates, discounts and daily questions.
Math
Useful arithmetic, ratios, proportions and powers.
Conversions
Convert common measurement and data units quickly.
Results that explain themselves.
Every NumLuma calculator is designed around the same sequence: inputs, formula, result, context. That keeps the experience familiar while every tool answers a different question.
Useful right now.
High-utility calculators across NumLuma. Each tool is free, fast and built to make its math understandable.
See the complete index ↗Percentage Calculator
Find X% of any number.
Percentage Change Calculator
Measure percentage increase or decrease.
Discount Calculator
Calculate sale price and savings.
Date Difference Calculator
Count days between two dates.
Hourly to Salary Calculator
Convert hourly pay to annual salary.
Salary to Hourly Calculator
Convert annual salary to hourly pay.
Overtime Pay Calculator
Estimate regular and overtime pay.
Freelance Rate Calculator
Estimate a target freelance hourly rate.
Profit Margin Calculator
Calculate profit and margin percentage.
One question usually leads to another.
Collections connect tools that naturally belong to the same real-world task.
All collections ↗Home Project Calculators
Best for renovation planning, material estimates and quick quantity checks.
↗ 02 Understand the economicsBusiness Profit & Pricing Calculators
Best for pricing decisions, campaign analysis and operating-metric checks.
↗ 03 Compare work and paySalary & Pay Calculators
Best for comparing job offers, schedules, freelance rates and pay periods.
↗ 04 See how money changes over timeLoan, Interest & Savings Calculators
Best for payment comparisons, savings scenarios and understanding interest.
↗ 05 Everyday number questionsPercentage & Price Calculators
Best for shopping, price comparisons and everyday percentage questions.
↗ 06 Convert without guessworkUnit Conversion Calculators
Best for measurements, specifications, travel and international unit comparisons.
↗ 07 Connect spend to performanceDigital Advertising Calculators
Best for paid-media analysis, campaign reporting and acquisition-cost checks.
↗ 08 Estimate before you buildConstruction & Material Calculators
Best for estimating construction materials, coverage, volume and waste before purchasing.
↗ 09 Connect revenue to profitEcommerce Profit & Growth Calculators
Best for online-store pricing, customer acquisition, revenue planning and unit-economics checks.
↗ 010 Price your time clearlyFreelance Pricing & Income Calculators
Best for freelancers, contractors and independent professionals comparing rates, capacity and project quotes.
↗ 011 Model growth over timeInvestment & Growth Calculators
Best for comparing savings and growth scenarios, time horizons and rate assumptions.
↗ 012 Count time without guessworkDate & Time Calculators
Best for countdowns, age checks, elapsed-time questions, schedules and work-hour calculations.
↗ 013 Solve everyday mathMath, Ratio & Percentage Calculators
Best for quick arithmetic, school-style practice, comparisons and everyday number questions.
↗Pick up where you left off.
Understand the number.
Evergreen guides explain the relationships behind the calculations people use most.
Browse guides ↗Percentages Made Simple
A practical guide to percentages, percentage change, discounts and common percent calculations.
Read guide ↗ 02 BusinessProfit Margin vs. Markup
Understand the difference between margin and markup, why they are not interchangeable, and how each is calculated.
Read guide ↗ 03 WorkHourly Pay vs. Salary: How to Compare Them
Convert hourly, weekly, monthly and annual pay using consistent assumptions about hours and working weeks.
Read guide ↗