Simple, transparent calculators.
Fast, private calculations with clear formulas and step-by-step math.
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Popular Calculators
Everyday tools with transparent steps and clean math.
Mortgage Calculator
Calculate your monthly payment including principal, interest, taxes, and insurance.
Percentage Calculator
Find percent of a number, percentage increase or decrease, and relative differences.
BMI & Weight Range
Check body mass index with standard health categories and a healthy weight range.
Calorie & TDEE
Estimate daily maintenance calories and realistic deficits for weight goals.
Browse by Category
All calculatorsFinancial
View all financial toolsFitness & Health
- BMI Body Mass IndexWHO scale
- Calorie Deficit & TDEEDaily energy
- BMR Metabolic RateResting burn
- Body Fat PercentageNavy method
Math
- Percentage CalculatorAll 4 types
- Standard DeviationSample / Pop.
- Fraction OperationsStep reducer
- Triangle SolverTrigonometry
Electrical
- Electrical PowerPower & Energy
- Power FactorPower & Energy
- Electrical EnergyPower & Energy
- Battery CapacityPower & Energy
Tech
- Text to BinaryEncoding & Web
- Case ConverterText Tools
- Word FrequencyText Tools
- Aspect RatioScreens & Images
Conversion
- Unit ConverterLength, mass, temp
- Weight Converterkg, lb, oz
- Temperature Converter°C, °F, K
- Volume ConverterL, gal, cups
Everyday
View all everyday toolsReference
View all reference tablesTransparent math.
No black boxes.
Most calculators hand you a single number and stop. Calxy lays out the arithmetic: you can see the equation, substituted variables, and the reasoning behind each result.
Verifiable Formulas
Every step laid out so you can confirm it in a spreadsheet.
100% In-Browser
Calculations run locally on your device.
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No registrations, paid tiers, or locked results.
M = P · [ r(1 + r)^n ] / [ (1 + r)^n − 1 ]Principal and interest only. Taxes and insurance are calculated separately.