Toolsque is a set of free calculators and QR code tools for people who run small businesses and do the work themselves: contractors pricing a job, freelancers working out a rate, shop owners checking whether a discount still leaves a profit, and anyone who needs a QR code without signing up for a subscription.

Every tool runs entirely in your browser. Nothing you type is uploaded, logged or stored on a server, and there is no account to create. That matters more than it sounds: the figures you put into a job costing sheet or a tax estimate are your business, and there is no reason for them to leave your device.

What the tools cover

Construction and trades. Material and cost estimating for concrete, roofing, drywall, gravel, insulation, framing spans and stair layout. The span and stair tools reference the standard residential code tables rather than inventing numbers, and they say plainly where a professional sign-off is still required.

Pricing and business finance. Markup and margin, wholesale pricing, discounts, break-even, job costing, invoicing and marketing return. These are the calculations that quietly decide whether a business is profitable, and the ones most often done wrong: confusing markup with margin, or measuring return on revenue instead of gross profit.

QR codes. Generators for WiFi, payments, phone numbers, PDFs and printed labels, plus decoders that read a code from a photo or screenshot when you have no second device to scan with.

How the calculators are documented

Each tool shows the formula it uses. If a calculator tells you to buy 17 bags of concrete, you can see exactly how it reached that figure, which assumptions it made, and what it deliberately left out: permits, delivery, waste beyond the stated allowance. A result you cannot check is a result you should not price a job on.

The estimates are honest about their limits. Cost figures are market ranges, not quotes. Tax tools are estimates that ignore state and local rules. Where a number depends on something we cannot know, the tool says so instead of guessing.

Who maintains this

Toolsque is built and maintained by Najeeb. If a formula looks wrong, a default is off for your region, or a tool gives a result you cannot reconcile, say so. Corrections get made, and knowing where a tool is wrong is more useful than pretending it never is.

The three sums that cost the most

Three errors turn up more than any others in the arithmetic these calculators handle. None of them are difficult. Each is a single division put on the wrong denominator, and each survives because the wrong answer still looks like a sensible number.

Markup is measured against cost, margin against price

Take a job that costs $10,000 to deliver. Add 50% markup and you invoice $15,000, so the profit is $5,000, which is 33.3% of that invoice. To keep half the invoice you have to price at $20,000, because price equals cost divided by one minus the margin, and $10,000 divided by 0.5 is $20,000. That is a 100% markup.

The conversion runs both ways: margin = markup ÷ (1 + markup), and markup = margin ÷ (1 − margin). A 20% markup is a 16.7% margin. A 40% markup is 28.6%. If you have been quoting markup and booking it as margin, the shortfall on the job above is $5,000 of price you never charged, and it repeats on every job. Running the figure through the contractor markup calculator shows both numbers side by side, which is usually enough to break the habit.

The hour costs more than the wage

Employer payroll tax is 7.65% of wages before anything else: 6.2% Social Security and 1.45% Medicare, per IRS rules. On top of that sit federal and state unemployment, workers' compensation at a rate set by trade class and state, plus holiday, insurance, training and consumable tooling. As a rule of thumb, burdened cost lands 20% to 30% above the wage. Treat $25/hr as $30 to $32.50, and use $31 for planning.

On a job with 400 labor hours, costing at wage books $10,000. Burdened, the same hours book $12,400. Apply 50% markup to the wrong figure and you invoice $15,000 expecting $5,000 of gross profit when the real figure is $2,600. The gap is $2,400 a job. Ten jobs a year and it is $24,000. Keeping burdened labor on its own line, separate from materials and subcontractors, is the point of the job costing calculator, because burden hidden inside a blended rate stops being checkable.

Dividing a target income by 2,000 hours

Forty hours across fifty weeks is 2,000. Divide an $80,000 target by that and you get $40 an hour. The 2,000 is what breaks it. Quoting, invoicing, chasing late payment, bookkeeping, marketing, unpaid travel and the quiet weeks all come out of the same year. Half billable is a common planning assumption for a solo operator, and it is a rule of thumb rather than a measurement, so check it against your own timesheets.

At 1,000 billable hours the same $80,000 needs $80 an hour. Then the deductions start. With $12,000 of annual overhead, $80,000 of receipts leaves $68,000 of net profit, and self-employment tax at 15.3% on 92.35% of that, roughly 14.1%, takes about $9,600 before any income tax is calculated. That is why a day rate is worth converting against billable days rather than calendar days in the day rate to hourly calculator, and why the 1099 tax calculator should be fed net profit after deductions instead of invoiced totals.

Run it backwards if the rate has to stay at $40. A thousand billable hours is $40,000 of receipts, $28,000 after the same overhead, and roughly $24,000 once self-employment tax is paid.