Calculator collection
21 toolsFree online calculators for BMI, age, date difference, percentage, discount, unit conversion, currency conversion and time zones.
Browser-first workflowWorkflow tools
Start with a curated tool, then continue through category-matched utilities discovered automatically from the live catalogue.
Calculate body mass index from height and weight and view the standard adult BMI category range.
Calculate exact age in years, months and days from a date of birth to a selected date.
Measure the number of days, weeks, months or years between two dates for planning and deadlines.
Calculate percentage values, what percent one number is of another, percentage change, difference, reverse percentage and marks.
Calculate the final sale price, amount saved and discount percentage for purchases and promotions.
Calculate gross profit, margin and markup from cost and selling price for pricing decisions.
Convert common length, weight, temperature, area, volume and speed units for work, study and travel.
Convert monetary amounts between currencies using a manually supplied exchange rate for transparent calculations.
Convert a date and time between time zones for international meetings, travel and remote work.
Calculate weighted means for grades, inventory costs, supplier scores, portfolios and performance measurements.
Estimate taxable income and tax from entered figures for planning; verify results against current official rules.
Estimate monthly loan instalments, total interest and total repayment from principal, rate and tenure.
Estimate the future value of regular investments using contribution amount, duration and expected return.
Compare loan repayment scenarios using principal, interest rate and term before making a borrowing decision.
Project savings or investment growth when interest is added repeatedly over time.
Calculate invoice due dates for Net 7, Net 15, Net 30, Net 45, Net 60, Net 90, business-day and end-of-month payment terms.
Calculate unit, total and percentage purchase price variance against a standard, budget or previous price.
Calculate cubic metres, cubic feet and shipment weight for multiple cartons with quantity and unit conversion.
Evaluate early payment terms such as 2/10 Net 30, including savings and the approximate annualised cost of skipping the discount.
Calculate procurement KPIs for variance, delivery, cycle time, compliance and savings.
Calculate recipe cost, cost per serving, food-cost percentage and gross margin using ingredient prices and usable yield.
Workflow guide
Calculator tools are online utilities that help users solve common numerical problems quickly. They are useful for daily life, shopping, education, travel, business and planning. FormatForge calculator tools include BMI calculator, age calculator, percentage calculator, discount calculator, unit converter, currency converter and time zone converter.
Online calculators reduce manual errors and save time. A percentage calculator helps with marks, growth or proportions. A discount calculator shows savings and final price. A unit converter helps convert length, weight and temperature. A time zone converter helps plan calls across countries. A currency converter gives a quick indicative conversion between currencies.
Common workflows include calculating age for forms, checking BMI, finding percentage values, calculating discount during shopping, converting units for study or work and converting time zones for international meetings. These tools are simple but frequently used.
Use calculators when you need quick estimates and do not want to build a spreadsheet. For financial or official calculations, verify the result and check current rules or rates before making a decision.
Related learning
Common questions
Free online calculators for BMI, age, date difference, percentage, discount, unit conversion, currency conversion and time zones.
Start with the utility that matches the exact input and outcome you need, then follow the related links for validation or the next workflow step.
Review the output, compare important totals or fields with the source and test a small sample in the destination system before relying on it for production work.
Yes. The listed FormatForge tools can be opened without creating an account. Individual pages explain processing, limitations and any important verification steps.
No installation is required for these browser-based workflows. Some advanced or organisation-specific tasks may still require specialist desktop or enterprise software.
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