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38 calculators for finance, math, health, and everyday use
All calculations run in your browser — no data leaves your device.
Calculate margin, markup, and required selling price
Open toolCalculate monthly payments and amortization schedule
Open toolEstimate monthly mortgage payments with taxes, insurance, and PMI
Open toolCalculate US sales tax by state with optional local rates
Open toolAdd or remove GST/VAT with international preset rates
Open toolCalculate compound interest with contributions and yearly breakdown
Open toolCalculate tips and split bills between friends
Open toolCalculate discounts, sale prices, and savings
Open toolCalculate ROI, CAGR, and profit/loss on investments
Open toolEstimate take-home pay after taxes and deductions
Open toolSee how inflation erodes purchasing power over time
Open toolSolve for selling price, cost, markup, or margin
Open toolCalculate percentages, percent change, and add/subtract percentages
Open toolFast arithmetic calculator for everyday math
Open toolAdvanced calculator with trig, logs, powers, and roots
Open toolAdd, subtract, multiply, divide, and simplify fractions
Open toolCalculate mean, median, sum, min, max, and count
Open toolCalculate area and perimeter for geometric shapes
Open toolCalculate volume and surface area for 3D shapes
Open toolSolve voltage, current, or resistance instantly
Open toolSolve for speed, distance, or time given the other two
Open toolConvert between data storage units with SI and IEC
Open toolCalculate BMI, BMR, and daily calories with activity levels
Open toolEstimate ideal body weight using 4 medical formulas
Open toolCalculate exact age in years, months, days, and total days
Open toolCalculate semester and cumulative GPA with multiple grading scales
Open toolConvert units for length, weight, temperature, area, and volume
Open toolConvert times across 27+ zones with meeting planner
Open toolGenerate random numbers or roll virtual dice
Open toolGenerate strong, secure passwords with strength meter
Open toolLive countdown to any event with holiday presets
Open toolFind days between dates or add/subtract days from any date
Open toolEstimate trip fuel cost from distance, efficiency, and price
Open toolEstimate daily, monthly, and annual energy costs for appliances
Open toolConvert between Celsius, Fahrenheit, and Kelvin
Open toolAdd/subtract time units, count business days, and find nth weekdays
Open toolFocus timer with work/break cycles and session tracking
Open toolCreate professional invoices and download as HTML or print to PDF
Open toolYes — every calculator is verified against known-correct values with automated tests on every build. We currently run 451 formula tests.
Absolutely. All calculations happen in your browser. No data is sent to any server.
Yes, all calculators are fully responsive and work on phones, tablets, and desktops.
No. All tools are free and require no sign-up or login.