Calculators & Converters20 live toolsClient-side first

Calculators & Converters tools

Everyday calculators for finance, health, dates, units, fuel, electricity, and quick conversions.

Browse the live tools below to compare workflows, then jump into related utilities through the category hub without losing context.

Percentage Calculator

Solve common percentage calculations instantly — what is X% of Y, percentage change, and reverse percent.

Estimate GPA from course grades and credit hours — supports 4.0 and weighted grading systems.

Calculate exact age from a birth date with years, months, and days — find how many days until your birthday.

Measure the exact duration between two dates and times — calculate days, weeks, months, and hours between dates.

Estimate monthly EMI payments, total interest cost, and full repayment schedule for any loan.

Calculate body mass index from weight and height — includes BMI category classification and health guidance.

Convert between common units for length, weight, speed, and temperature — instant multi-unit calculator.

Convert currencies with live exchange rates plus offline fallback — support for 150+ world currencies.

Convert a date and time across major world time zones — plan meetings across countries instantly.

Convert numbers to Roman numerals and vice versa — supports I to MMMCMXCIX with instant conversion.

Calculate tip amount, total bill, and per-person split in one step — the easiest restaurant tip calculator.

Work out discount savings and final price after percentage reductions — calculate sale prices instantly.

Measure percentage increase or decrease between two values — essential for financial and analytics reporting.

Calculate selling price and profit from cost and markup percentage — retail pricing made simple.

Estimate gross margin percentage and net profit from selling price and cost — essential for pricing decisions.

Estimate fuel needed and trip cost from distance, efficiency, and fuel price — plan road trips easily.

Estimate monthly electricity cost from wattage, daily runtime, and energy price — reduce your power bill.

Calculate running pace per kilometer and average speed from distance and total time — runner's must-have tool.

Estimate future value and earned interest with annual compound growth — investment and savings planning tool.

Calculate speed, distance, or time from any two known values — physics and travel planning formula tool.