Calculators

Practical calculators for everyday decisions—percentages, loans, mortgages, taxes, BMI, calories, and more. Every page shows the formula, steps, and a worked example.

New to a topic? Start with a guide that explains the method, then run the linked calculator with your own numbers.

Showing 77 of 77 tools

Percentage Calculator

Calculate percentage increase, decrease, and differences with clear steps.

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Discount Calculator

Find sale prices instantly and understand how discount math works.

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Date Difference Calculator

Compute days between dates and avoid common manual counting mistakes.

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Tip Calculator

Calculate tip amounts and split bills in seconds for restaurants, travel, and shared payments.

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Salary to Hourly Calculator

Convert annual salary to hourly pay with clear schedule assumptions and transparent math.

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Hourly to Salary Calculator

Estimate yearly income from hourly rates and work schedules.

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Sales Tax Calculator

Add or remove sales tax amounts quickly for shopping decisions.

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VAT Calculator

Calculate VAT-inclusive and VAT-exclusive prices clearly for invoices and pricing scenarios.

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Loan Payment Calculator

Estimate monthly loan payments using amount, rate, and term.

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ROI Calculator

Measure return on investment with transparent formula steps.

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Business Days Calculator

Count weekdays between dates for planning, operations, and timeline estimation tasks.

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Markup Calculator

Calculate markup percentage and target selling prices for product and service offers.

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Margin Calculator

Find gross margin percentages and profit amounts quickly for pricing and budgeting decisions.

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Age Calculator

Calculate exact age in years, months, and days from date of birth and reference date.

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BMI Calculator

Estimate body mass index from height and weight with standard BMI category guidance.

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Calorie Calculator

Estimate daily calorie needs using BMR and activity level assumptions for planning.

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Compound Interest Calculator

Project savings growth with recurring compounding and optional monthly contributions.

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Mortgage Calculator

Estimate monthly mortgage payment, total interest, and total repayment amount.

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Savings Goal Calculator

Estimate how much to save monthly to reach a target amount in a chosen time frame.

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Break-even Calculator

Find break-even units and revenue from fixed costs, variable costs, and selling price.

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Due Date Calculator

Estimate due date from last menstrual period or conception date using standard rules.

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Unit Converter

Convert length, weight, and temperature values quickly for daily and professional use.

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Time Zone Converter

Convert time between major UTC offsets to coordinate meetings and deadlines.

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Currency Converter

Convert amounts between popular currencies using manually entered exchange rates.

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Fuel Cost Calculator

Estimate fuel spending for trips from distance, efficiency, and fuel price.

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GPA Calculator

Compute weighted GPA from course grades and credit hours with transparent math.

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Hours Calculator

Calculate worked hours between start and end times including optional break deduction.

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Pace Calculator

Estimate running pace, finish time, or distance from any two known variables.

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Ovulation Calculator

Estimate ovulation and fertile window from cycle length and last period start date.

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Debt Payoff Calculator

Estimate months to become debt-free based on balance, APR, and monthly payment.

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EMI Calculator

Calculate equated monthly installment from principal, interest rate, and loan tenure.

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Body Fat Calculator

Estimate body fat percentage using waist, neck, height, and sex-based formulas.

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Grade Percentage Calculator

Convert earned points and total points into percentage score instantly.

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Study Time Calculator

Plan daily study duration from target hours, deadline, and available days.

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Pregnancy Weight Gain Calculator

Estimate recommended pregnancy weight gain range based on pre-pregnancy BMI.

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APR Calculator

Estimate annual percentage rate from loan amount, fees, payment, and term assumptions.

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APY Calculator

Convert nominal interest rate and compounding frequency into annual percentage yield.

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Ideal Weight Calculator

Estimate healthy weight range using common formula-based approaches from height and sex.

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Conception Date Calculator

Estimate conception date from due date or last menstrual period using standard assumptions.

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Meeting Time Overlap Calculator

Find overlapping working-hour windows between two teams in different UTC offsets.

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Vacation Budget Calculator

Estimate travel budget from accommodation, meals, transport, and activity costs.

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Depreciation Calculator

Estimate asset value over time using straight-line depreciation assumptions.

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Inflation Calculator

Estimate purchasing power changes over time using an annual inflation rate.

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Loan Affordability Calculator

Estimate affordable loan amount from income, debt ratio, rate, and term inputs.

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Workday Pay Calculator

Estimate daily and weekly earnings from hourly rate, hours worked, and overtime.

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Water Intake Calculator

Estimate daily water intake target from body weight and activity level.

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Split Bill Calculator

Split a bill with tip and optional uneven contributions across multiple people.

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CAGR Calculator

Calculate compound annual growth rate from start value, end value, and years.

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Net Worth Calculator

Estimate personal net worth by subtracting total liabilities from total assets.

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Monthly Budget Calculator

Plan monthly cash flow from income, fixed costs, variable spending, and savings goals.

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Countdown Calculator

Calculate remaining days, hours, and minutes until a selected target date and time.

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Retirement Calculator

Project retirement savings from current balance, contributions, return, and years.

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Rent vs Buy Calculator

Compare estimated monthly housing cost between renting and buying scenarios.

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Emergency Fund Calculator

Estimate emergency savings target from monthly essential expenses and coverage months.

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Debt to Income Calculator

Calculate debt-to-income ratio from monthly debt payments and gross monthly income.

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Commission Calculator

Estimate commission payout from sales amount, rate, and base pay assumptions.

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Unit Price Calculator

Compare products by unit price from total cost and quantity.

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Overtime Calculator

Calculate overtime earnings using hourly rate, overtime hours, and multiplier.

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Interest Only Loan Calculator

Estimate monthly interest-only payment from loan amount and annual interest rate.

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Markup vs Margin Calculator

Convert between markup and margin percentages for clearer pricing decisions.

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Sales Commission Tier Calculator

Estimate commission earnings across multiple sales tiers with different rates.

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Break Duration Calculator

Calculate total break duration between start and end times with minute precision.

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PPM Calculator

Convert percentage values to parts-per-million and vice versa for technical workflows.

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Salary After Tax Estimator

Estimate take-home pay from gross salary and overall effective tax rate assumptions.

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Price per Square Foot Calculator

Calculate property price per square foot or square meter from total price and area.

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Mortgage Refinance Calculator

Compare current mortgage payment with refinance scenario and estimate monthly savings.

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Simple Interest Calculator

Calculate simple interest and total amount from principal, rate, and time.

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Average Calculator

Compute arithmetic mean from a list of numeric values quickly.

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Weighted Average Calculator

Calculate weighted average from values and corresponding weights.

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Percentage Difference Calculator

Calculate percentage difference between two values using a standard formula.

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Calorie Deficit Calculator

Estimate calorie deficit target from maintenance calories and desired weight-loss pace.

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Goal Timeline Calculator

Estimate how long it takes to reach a target amount with fixed monthly contributions.

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Hourly Rate from Project Calculator

Calculate effective hourly rate from project revenue, hours worked, and expenses.

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Profit Calculator

Estimate gross profit and profit percentage from revenue and total costs.

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Days Until Retirement Calculator

Calculate remaining days until planned retirement date from current date.

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Temperature Converter

Convert Celsius, Fahrenheit, and Kelvin instantly with accurate formulas.

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Discount vs Coupon Calculator

Compare final price impact of percentage discount versus fixed coupon value.

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Popular Guides

Learn the method first, then run the calculator with your own numbers.