All tools
Calculators
Calculate everyday, health, and finance values quickly. Check each calculator's input conditions and result guidance to choose the right tool for your task.
18 available tools
- Age, Birthday, and Elapsed Days CalculatorCalculate completed age, exact elapsed time, elapsed days, and days until a birthday from a birth date and reference date.
- Adult BMI and Healthy Weight Range CalculatorUse metric or US height and weight to calculate adult BMI, its WHO classification, and a healthy-weight range for your height.
- BMR and Maintenance Calorie CalculatorCalculate adult basal metabolic rate and estimated maintenance calories with Mifflin-St Jeor and explicit activity factors.
- Business Day Calculator | Count or Add Working DaysCount business days in a date range or add and subtract working days with configurable weekends and custom excluded dates.
- Basic Arithmetic CalculatorA safe browser calculator for decimal arithmetic, signs, and parentheses.
- Compound Interest CalculatorCalculate ending balance, contributed principal, and earned interest from a starting amount, monthly deposits, nominal rate, and frequency.
- Date Calculator | Difference, Add or Subtract DatesFind total days and calendar years, months, and days between dates, or add and subtract signed years, months, weeks, and days.
- Discount CalculatorCalculate the final price after stacked discounts and post-discount tax.
- Fraction Calculator | Simplify, Mixed Number & DecimalUse exact BigInt arithmetic for large integer fractions and show simplified improper, mixed-number, and 12-place decimal forms.
- Fuel Cost Calculator | Distance, MPG & Round-Trip EstimateEstimate fuel and shared trip cost from distance, km/L, L/100 km or US MPG, price per liter, trip count, and round trips.
- GPA Calculator | Credit-Weighted Course AverageWeight course grade points by credits on 4.0, 4.3, 4.5, or custom scales and total completed credits.
- Loan Payment CalculatorCalculate the monthly payment, total interest, payoff date, and annual principal-interest split for a fixed-rate loan.
- Mortgage Extra Payment CalculatorDerive financed principal from price and down payment, then compare how extra monthly principal changes interest and payoff time.
- Percentage CalculatorCalculate a percentage of a value, a ratio, or percent change with explicit formulas.
- Time Calculator | Difference, Add, Subtract & Day RolloverFind a clock-time difference with explicit overnight handling, or add and subtract time while reporting day rollover.
- Tip CalculatorQuickly calculate a tip, total bill, and per-person shares.
- VAT Calculator | Add Tax or Extract VAT from a Gross AmountApply your own rate to a net amount or reverse a tax-inclusive total into net, tax, and gross values.
- Work Hours Calculator | Weekly Time, Overnight Shifts & PayTotal daily clock times and breaks, support overnight shifts, and estimate pay above a user-defined weekly threshold.