96 free tools · no signup
Decide in minutes, not afternoons.
Fast, accurate calculators and converters for home, money, health, energy, travel, and the kitchen — measure, enter, and get a number you can trust.
Browse by category
Seven collections, 96 tools — pick a category to see everything in it.
Home Improvement
Plan the project before you swing the hammer — budgeting, financing, and material math without the spreadsheet.
12 calculators →
Travel
Plan the trip before you book it — budgets, fuel, packing, and the small decisions that add up.
6 calculators →
Cooking & Baking
Cups to grams for real ingredients, plus oven temperatures — weigh it right and bake it at the correct heat.
10 calculators →
Health & Fitness
Calories, body metrics, hydration, protein, and training numbers — clear estimates for general guidance, never medical advice.
8 calculators →
Electricity & Energy
Run-cost, appliance, and solar math in plain dollars — what a device costs, what a system makes, and your bill line by line.
32 calculators →
Finance & Math
Percentages, tips, discounts, tax, markup, pay, and interest — the everyday money math, worked out clearly. General information, not financial advice.
16 calculators →
Unit Converters
Fast, exact unit conversions — metric to imperial and back, each with the real factor and a one-tap swap.
12 calculators →
Popular tools
A few of the most useful tools across the site to get you started.
Paint Calculator
Work out how many gallons you need for any room — walls, ceiling, and multiple coats included.
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Percentage Calculator
The three everyday percentage questions in one tool — X% of Y, X is what % of Y, and percent change.
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Compound Interest Calculator
Growth with interest on interest — principal, rate, time, compounding frequency, and optional monthly deposits.
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Tip Calculator
Tip, total, and the per-person split — pick 15/18/20/25% or enter your own.
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Electricity Cost Calculator
What any device costs to run — watts, hours, and your rate to dollars per day, month, or year.
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BMR Calculator
Calories your body burns at complete rest — the Mifflin-St Jeor basal metabolic rate.
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Concrete Calculator
Slab volume in cubic yards and bags — with the order margin that prevents a short pour.
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Kg to Lbs Converter
Convert kilograms to pounds — body weight, luggage, and gym plates, with a one-tap swap.
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