BoringToolsKit — everyday calculators & tools
Whatever you need to figure out today — a payment, a fee, a measurement — type it below and we’ll point you to an available tool.
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Back to school 2026
Plan the semester: estimate your GPA, work out a school budget, and see what a grade actually takes. Free, no signup, runs in your browser.
Open the calculators →Use it without an app
Add BoringToolsKit to your phone's home screen and every tool you open stays usable with no connection — perfect for flights, commutes, and spotty signal. A pocket calculator that doesn't need to phone home.
Browse the catalogue or search by the job you need to do.
Calculator hubs
Grouped collections for the money, home, health, time, seller, construction, and energy decisions people actually run.
New and updated tools, ordered by their authored review date.
Convert cooking and baking measurements between cups, tablespoons, teaspoons, grams, ounces, milliliters, and
Generate business and brand name ideas from your industry and style — privacy-clean, no sign-up.
Calculate the number of combinations (nCr) of choosing r items from n, with the formula explained.
Generate groan-worthy dad jokes and one-liners by category — instantly, right in your browser.
See the exact score you need on your final exam to reach your desired course grade.
Evaluate math expressions with the correct order of operations (PEMDAS): parentheses, exponents, multiplicatio
All 832 available tools load in alphabetical batches as you scroll.
How BoringToolsKit works
Every BoringToolsKit calculator runs in your browser — nothing you type is sent to a server. That matters for money, health, and school totals you'd rather keep private. Each tool shows its formula, a worked example, and the assumptions behind the result, so you know what the number assumes rather than trusting a black box. Here's how to get the most from the common decision areas.
Work out a mortgage payment or loan term, check how much you'll actually take home after deductions, or set a savings goal and see the monthly contribution it takes. Start with a payment estimate, then use the amortization and payoff tools to see the cost of a longer term.
From rent affordability to household budgets and energy costs, these tools help you price a decision before you commit. Estimate a bill, compare an appliance's running cost, and see how a renovation or a new purchase changes the yearly number.
Estimate daily calorie needs, BMI and body-fat ranges, and pacing for exercise. These are planning anchors — not medical advice — so read the displayed assumptions and confirm important totals with a professional.
Convert an hourly rate to an annual salary, work out overtime and a pay raise, and plan time for tasks. Good for a quick number before a conversation about pay or a deadline.
Marketplace and payment fees can swallow a margin. Estimate net profit after Amazon, eBay, Etsy, or Shopify fees, work out a break-even, and price a product with the fee structure shown in the result.
Estimate materials and waste for a concrete, flooring, or roofing job; compare energy use and cost; and size up a rental or a flip with cap rate, cash flow, and after-repair value. Each result lists the rate or input it assumes.
Every result is calculated locally with the inputs shown. Verify anything that affects a real commitment against current rates, local rules, or a qualified professional — the tools are planning aids, not guarantees. See the methodology for the formulas and reference cases behind each family.
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