Free Online Calculators, Money, Health, Date & Everyday Math
Whether you're calculating tax, tracking calories, or planning a budget, every calculator here is free, instant, and runs in your browser.
What people use most
How calculators work
Pick a calculator
Choose from 60+ calculators covering money, health, fitness, dates, and everyday tasks.
Enter your numbers
Fill in the inputs. Every calculator uses validated formulas from official and peer-reviewed sources.
Get instant results
Results appear immediately with breakdowns, charts, and context. Nothing is stored or sent anywhere.
Common tasks
Money & finance
VAT Calculator
Add or remove VAT/Sales Tax
Profit Margin
Calculate margin and markup
Salary Calculator
Convert between pay periods
ROI Calculator
Return on investment and CAGR
Tip Calculator
Calculate tips and split bills
Take-Home Pay
UK net pay after tax
Hourly Rate Calculator
Salary to hourly rate
Expense Split
Split bills fairly
Percentage Calculator
Quick percentage calculations
Discount Calculator
Sale prices and savings
Markup Calculator
Markup vs margin
Break-Even Calculator
Break-even analysis
Commission Calculator
Sales commission rates
Freelance Rate
Ideal freelance day rate
Rent Affordability
How much rent you can afford
Unit Price Calculator
Best deal finder
Zakat Calculator
Islamic charity calculation
Net Worth Calculator
Assets minus liabilities
Inflation Calculator
Purchasing power over time
Tax Bracket Calculator
UK income tax per band
Currency Converter
35+ currency rates
Grocery Budget
Food budget planning
Travel Budget
Trip cost breakdown
Electricity Cost
Appliance running costs
Fuel Cost Calculator
Journey fuel costs
Health & fitness
BMI Calculator
Body Mass Index with categories
Calorie Calculator
Daily calorie needs
TDEE Calculator
Total daily energy expenditure
Macro Calculator
Protein, carbs, and fat targets
BMR Calculator
Basal Metabolic Rate
Body Fat Calculator
Estimate body fat percentage
Ideal Weight
Healthy weight range
Healthy Weight
WHO-based weight range
Protein Intake
Daily protein needs
Carbohydrate Calculator
Daily carb intake by goal
Fat Intake Calculator
Daily fat needs
Water Intake
Daily hydration target
Calories Burned
Exercise calorie counter
Weight Loss Calculator
Calorie deficit planner
Sleep Calculator
Optimal sleep cycles
Target Heart Rate
Exercise heart rate zones
Date & time
Frequently asked questions
Are these calculators accurate?
Yes. All calculators use standard formulas from official sources. Health calculators use peer-reviewed medical formulas like Mifflin-St Jeor and Harris-Benedict.
How do I start using a calculator?
Open the calculator, enter your numbers, and read the result in your browser.
Where do my numbers go?
Calculations run in your browser. The values you enter stay on your device while you use the calculator.
Can I use these on my phone?
Yes. All calculators are fully responsive and work on any device.