Percentages, prices, and business math
Calculate percent of a value, increase or decrease, markup, margin, cost and selling price, profit or loss, discounts, tax, and compound growth.
EVERYDAY CALCULATORS
Practical calculators for percentages, finance, dates, distance, and conversions.
Calculate percentages, profit and loss, interest, loan payments, discounts, age, distance, adult BMI screening values, and common unit conversions in focused browser tools.HOW TO USE THIS COLLECTION
Use a clear formula for common real-world questions.
Everyday calculations can become confusing when the starting value, percentage base, time period, or unit is unclear. SolveGrid separates each workflow so the inputs and formula remain easy to review.
Choose Percentage Calculator for percent change, markup, margin, reverse percentages, and growth. Use the finance calculators for simple interest, compound growth, loan payments, profit and loss, or discount and tax. Date, distance, conversion, and adult BMI screening tools cover common non-finance tasks.
AVAILABLE CALCULATORS
Choose a focused tool for the task.
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Percentage Calculator
Choose from ten percentage workflows including change, reverse calculations, selling-price markup, profit margin, and compound growth.
Distance Calculator
Find Euclidean distance and midpoint between two points, or calculate travel distance, speed, or time from the other two values.
Age Calculator
Enter a date of birth and calculate calendar age on today’s date or a selected reference date, with years, months, days, totals, and next-birthday timing.
BMI Calculator
Use adult height and weight measurements to calculate BMI as a screening measure. An optional age field confirms this adult-only tool is appropriate; it is not a diagnosis.
Profit, Loss & Margin Calculator
Enter cost price and selling price to calculate profit or loss amount, markup on cost, profit margin on revenue, and the difference between margin and markup.
Simple Interest Calculator
Use principal, annual rate, and time in years, months, or days to calculate simple interest, interest earned, final amount, and a clear formula breakdown.
Compound Interest Calculator
Project compound growth using a starting balance, annual rate, years, frequency, and optional regular contributions.
Loan Payment Calculator
Estimate an amortized payment, total repayment, and interest for a loan using a chosen payment frequency.
Discount & Tax Calculator
Calculate a discount amount, sale price, optional tax, and final price with a compact discount calculator.
COMMON WORKFLOWS
What you can calculate in this section
Interest and loan payments
Estimate simple interest, compound growth, periodic loan payments, total repayment, and total interest from clearly labelled rates and time periods.
Dates, distance, units, and screening
Calculate calendar age, coordinate or travel distance, convert measurements, and use an adult-only BMI screening calculation with appropriate scope notes.
CHOOSE THE RIGHT METHOD
A practical three-step workflow
Identify the original value
Percentage change, discount, markup, and margin use different bases. Confirm whether the calculation starts from the original price, cost price, selling price, or another reference value.
Match the rate and time period
Interest calculations depend on whether a rate is annual and whether time is entered in years, months, or another period. Keep the units consistent before calculating.
Treat estimates as estimates
Loan results exclude lender-specific fees and rules, while adult BMI is a screening measure rather than a diagnosis. Important financial or health decisions need appropriate professional context.
LEARN THE FORMULA OR METHOD
Related SolveGrid guides
GUIDEPercentage increase and decreaseFind percentage change from an original value to a new value.Read →GUIDEProfit margin vs markupCompare markup, profit margin, cost price, selling price, and the formulas behind business pricing.Read →GUIDESimple interest formulaCalculate interest from principal, annual rate, and time.Read →GUIDELoan payment formulaUnderstand periodic payments, total repaid, and total interest.Read →GUIDECalculate age from a date of birthFind calendar age in years, months, and days on a chosen date.Read →
COMMON QUESTIONS
Using everyday calculators
Which calculator should I use for percentage increase?
Use Percentage Calculator and choose the percentage-change or increase workflow. Enter the original value and the new value so the correct base is used.
Do loan and interest calculators include every bank fee?
No. They provide formula-based estimates and do not include lender-specific fees, insurance, taxes, penalties, or local rounding rules unless the page explicitly states otherwise.
Is the BMI calculator a medical diagnosis?
No. It is an adult-only screening calculation and does not diagnose a condition or account for every individual factor.
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