Percentage calculator
Solve four common percentage questions with a clear formula.
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Local-first calculators for transparent repeat-use arithmetic, cost, calendar, and work-rate assumptions.
Solve four common percentage questions with a clear formula.
Find the discount amount and final price for a percentage-off sale.
Calculate gross profit and gross-margin percentage.
Calculate markup amount and selling price.
Calculate profit and return on investment percentage.
Calculate simple interest and maturity value.
Project a compounded balance with optional monthly contributions.
Calculate monthly payment, total interest, and total repayment.
Generate a fixed-rate monthly amortization schedule.
Project a dated savings goal with monthly contributions.
Calculate VAT and net or gross totals from a supplied rate.
Calculate sales tax and a total from a supplied price and rate.
Calculate a tip, total bill, and per-person share locally.
Split a shared total among people with an optional extra charge.
Convert an amount using a manually supplied exchange rate.
Find elapsed calendar days, weeks, and approximate years between dates.
Calculate completed years, months, and days between a birth date and reference date.
Calculate elapsed days, hours, and minutes between two date-times.
Count weekdays between two dates with optional end-date inclusion.
Calculate daily elapsed and break-adjusted work hours from stated times.
Estimate fuel used and fuel cost from distance, efficiency, and price.
Estimate fixed-rate mortgage principal, payment, interest, and repayment.
Estimate payoff months, total paid, and interest from a balance, APR, and fixed payment.
Calculate contribution margin and units needed to cover fixed costs.
Calculate compound annual growth rate from start, end, and years.
Calculate net present value from a discount rate and period cash flows.
Estimate the internal rate of return of periodic cash flows locally.
Calculate a loan-to-value ratio from a loan amount and stated property value.
Calculate acquisition cost from sales and marketing spend and new customers.
Estimate a simple customer lifetime value to CAC ratio from stated assumptions.
Calculate net profit and net margin from revenue and total expenses.
Calculate operating income and operating margin from revenue, cost, and operating expenses.
Calculate commission and total pay from a sales amount, rate, and optional base.
Convert a stated annual salary into monthly, weekly, daily, and hourly equivalents.
Calculate an hourly equivalent from annual income and stated working hours.
Estimate a target freelance hourly rate from income, costs, billable hours, and buffers.
Calculate base pay, overtime pay, and total pay from stated hours and multiplier.
Calculate the portion of stated income retained as savings.
Calculate order-to-ship, ship-to-delivery, and total lead time.
Calculate inventory turnover and days in inventory.
Calculate a reorder point from average demand, lead time, and safety stock.
Estimate total, monthly, and hourly employee cost from salary and overhead.
Calculate a conversion rate from conversions and visitors.
Calculate cart abandonment rate from carts and completed purchases.
Calculate an email open rate from opens and delivered messages.
Compute body mass index from weight and height locally.
Estimate BMR and TDEE locally using the Mifflin-St Jeor formula.
Estimate body fat percentage using the US Navy method locally.
Compute ideal weight ranges from multiple formulas locally.
Estimate a due date and current gestational age from a last menstrual period locally.
Estimate a daily water intake target from weight and activity locally.
Convert macronutrient percentages into gram targets locally.
Check whether a positive integer is prime and report its factors locally.
Express a positive integer as a product of primes locally.
Generate a sequence of Fibonacci numbers locally.
Compute the factorial of a non-negative integer locally.
Compute the greatest common divisor of two or more numbers locally.
Compute the least common multiple of two or more numbers locally.
Add, subtract, multiply, or divide two fractions locally.
Compute a simplified ratio, decimal, and percentage from two values locally.
Compute mean, median, mode, range, sum, and count of a dataset locally.
Compute population and sample standard deviation locally.
Generate cryptographically secure random integers in a range locally.
Compute permutations P(n, r) = n! / (n−r)! — ordered arrangements — locally.
Compute C(n, r) = n! / (r! × (n−r)!) locally.
Solve ax² + bx + c = 0 for real roots locally.
Compute circumference and area of a circle from radius locally.
Compute area and perimeter for common triangle types locally.
Compute sin, cos, tan, asin, acos, atan in degrees or radians locally.
Convert between degrees and radians locally.
Compute log of a value with a chosen base locally.
Compute base^exponent locally in your browser.
Compute the n-th root of a positive number locally.