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Browse every published MiniApps World calculator, generator, and browser-based utility by category, keyword, or release date.

Use the catalog filters after the page loads, or follow any product link below.

• Age Calculator — Calculate calendar age, elapsed days, and the next birthday from local date values.
• Barcode Generator — Create and download customizable CODE128, EAN, UPC, CODE39, and ITF-14 barcodes.
• Base64 Encoder & Decoder — Encode and decode UTF-8 text with standard or URL-safe Base64.
• BMI Calculator — Estimate adult BMI, WHO classification, and a healthy-weight range.
• Body Fat Calculator — Estimate body-fat percentage with the US Navy circumference equations.
• Break-even Calculator — Calculate break-even units and revenue from fixed costs, unit costs, and selling price.
• Brick & Block Calculator — Estimate editable masonry units from net wall face area.
• Calorie Needs Calculator — Estimate BMR and daily maintenance energy with Mifflin–St Jeor.
• Car Loan Calculator — Estimate vehicle finance payments, interest, and amortization across common payment frequencies.
• Compound Interest Calculator — Calculate investment growth with compound interest and recurring contributions.
• Concrete Calculator — Estimate concrete volume for slabs, footings, columns, and cylinders.
• Cooking Measurement Converter — Convert cooking cups, spoons, fluid ounces, millilitres, grams, and pounds using explicit measure sizes, without guessing ingredient density.
• Crop Yield Calculator — Estimate harvest quantity and area yield from user-entered measurements and assumptions.
• Currency Converter — Convert money between currencies using a manually entered exchange rate.
• Data Storage Converter — Convert bits, bytes, decimal kB through TB, and binary KiB through TiB with explicit definitions for comparing file sizes and storage capacity.
• Date Difference Calculator — Calculate calendar and elapsed differences between two date-only values.
• Debt Payoff Calculator — Estimate debt payoff time, total interest, and the effect of optional extra payments.
• Depreciation Calculator — Create straight-line, declining-balance, and double-declining depreciation schedules.
• Discount Calculator — Calculate discounts, final prices and savings quickly.
• Download Time Calculator — Estimate download or upload time from file size and connection speed, distinguishing megabits from megabytes and allowing usable-speed adjustment.
• Electricity Cost Calculator — Estimate appliance electricity use and running costs from watts, daily hours, days, and your own kWh rate, without assuming a local tariff.
• EV Charging Cost Calculator — Estimate EV battery energy, wall energy, charging loss, and session cost from capacity, charge levels, efficiency, and your electricity rate.
• Fertilizer Application Calculator — Calculate fertilizer quantity from a user-entered rate and project size.
• Final Grade Calculator — Find the final assessment score needed for a target course grade using your current average and final weight, including unreachable targets.
• Flooring Calculator — Estimate flooring coverage, packs, perimeter, and optional material cost.
• Fuel Cost Calculator — Estimate trip fuel use, cost, passenger share, and vehicle efficiency differences.
• Fuel Economy Converter — Convert L/100 km, km/L, US mpg, and imperial mpg while keeping consumption and economy units—and both gallon definitions—explicit.
• GPA Calculator — Calculate a credit-weighted GPA from course grade points and credits on your own scale, with total credits and quality points shown.
• Home Battery Runtime Calculator — Estimate constant-load battery runtime from nominal capacity, usable capacity, inverter efficiency, and average AC power demand.
• Ideal Weight Calculator — Compare Devine, Robinson, Miller, and Hamwi reference-weight formulas.
• Invoice Generator — Create professional invoices with line items, taxes, customer details, and print-ready exports.
• Invoice Number Generator — Generate sequential and date-prefixed invoice-number batches.
• Irrigation Time & Water Volume Calculator — Estimate irrigation volume and runtime from user-entered area, depth, and measured flow.
• JSON Formatter & Validator — Validate, pretty-print, minify, and recursively sort JSON locally.
• Livestock Feed Requirement Calculator — Estimate feed quantity and cost from user-entered rations, periods, and allowances.
• Loan Calculator — Estimate monthly loan payments, total repayment and total interest.
• Markup & Margin Calculator — Calculate selling price, markup percentage, and gross margin from cost and price.
• Mortgage Calculator — Estimate mortgage payments, total interest, and loan-to-value ratio for a home loan.
• Overtime Calculator — Estimate regular, overtime, and total gross pay.
• Paint Calculator — Estimate paint for room walls, individual walls, or custom areas.
• Payslip Generator — Create professional printable employee payslips with earnings deductions and employer contributions.
• Percentage Calculator — Calculate percentages, increases, decreases, and differences for everyday decisions.
• Pregnancy Due Date Calculator — Estimate a pregnancy due date and gestational weeks from the first day of the last period, with clear assumptions and clinical limitations.
• Purchase Order Generator — Create professional printable purchase orders for suppliers with line items, taxes, shipping, discounts, and delivery details.
• QR Code Generator — Create customizable QR codes for websites, text, contact details, messaging, and Wi-Fi networks.
• Quotation Generator — Create professional printable sales quotations with line items, taxes, discounts, and customer details.
• Random Password Generator — Generate configurable passwords using browser cryptographic randomness.
• Receipt Generator — Create printable sales and payment receipts with line items, taxes, discounts, and payment details.
• Retirement Savings Calculator — Project retirement savings from current funds, contributions, and hypothetical investment returns.
• Return on Investment Calculator — Calculate simple and annualized return on investment including costs and distributions.
• Road Trip Time Calculator — Estimate road-trip driving, planned stop, and total time from distance, realistic average moving speed, and a simple stop schedule.
• Salary Calculator — Convert gross salary between hourly, daily, weekly, monthly, and annual pay using your paid-work schedule, before taxes and deductions.
• Sales Tax Calculator — Add or extract a custom sales tax rate for prices in any supported currency.
• Savings Goal Calculator — Calculate the recurring savings needed to reach a financial goal.
• Seed Rate & Plant Population Calculator — Estimate seed quantity and plant population from user-entered spacing, density, and establishment rates.
• Solar Panel Output Estimator — Estimate daily and period solar energy from array size, average peak sun hours, and a transparent combined system-loss assumption.
• Tile Calculator — Estimate whole tiles and boxes for repeated surfaces and custom areas.
• Time Duration Calculator — Calculate elapsed days, hours, minutes, and seconds.
• Timesheet Calculator — Calculate work periods, breaks, hours, and optional gross earnings.
• Tip Calculator — Calculate tips, split bills, and optionally round the tip or total in any currency.
• Unit Converter — Convert common length, mass, temperature, area, volume, and speed units locally.
• Unix Timestamp Converter — Convert Unix seconds or milliseconds and local or UTC date/time values.
• URL Encoder & Decoder — Encode, decode, parse URLs, and build or parse query strings locally.
• UUID Generator & Validator — Generate secure UUID v4 batches and validate canonical UUID values.
• VAT Calculator — Calculate VAT amounts and totals quickly.
• Water Intake Calculator — Estimate general daily water intake from weight, climate, and activity.
• Weighted Grade Calculator — Calculate your weighted average from assessment grades and course weights, with earned course points and remaining weight shown separately.
• Working Days Calculator — Count working, weekend, and manually excluded days using configurable calendars.

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