Free online tools, built by hand and tested one by one
Twenty calculators and converters that Talha Kayani needed himself, could not find in a working form, and decided to build properly. Every result is checked by hand, and every page is reviewed by a second person before it goes live.
Browse all 20 tools
Written by Talha Kayani
Reviewed by Salma Tahira
Human-made, not mass-produced
One person researches and builds each tool. A second person reviews each page. No generic AI text, no copied pages, no filler.
Your data stays with you
We collect no personal data. Every calculator runs inside your browser, and the numbers you type never reach our server.
Facts with sources
Each page carries a short set of facts, studies or proven figures, each one linked to an official or trusted source.
All 20 tools
Grams to cups converter for flour, sugar, butter and more
Type the grams, pick the ingredient, and get cups that match the recipe, with the density printed beside the answer.
Gas mark to Celsius and Fahrenheit converter with fan chart
Pick a Gas Mark, including the quarter and half marks old recipes use, and get Celsius, Fahrenheit, and the fan oven setting in one view.
Tola to grams converter for gold weight in Pakistan today
Enter tola, masha, ratti, or grams and get the exact weight in the other units, with the factor printed in the result so you can check any bill.
Marla to square feet converter with all three standards
Choose the standard your document uses, then convert marla and square feet both ways, with the standard printed inside every result.
Marks to percentage calculator for matric and inter results
Enter your marks and your board total and get the percentage at once, or set a target percentage and see the exact marks it demands.
Lakh to million converter with crore, billion and words
One amount in, and you get the converted value, the digits grouped both ways, and the amount in words in both systems, ready to paste into a report and check at a glance.
Zakat on gold calculator: nisab check in grams and tola
Tola in, answer out: the tool converts your weight, tests it against the 87.48 gram nisab line, and shows the zakat due in money and in grams at the price you enter.
HbA1c to average blood sugar converter with full eAG chart
Enter the percentage from your lab report and get the average glucose figure your meter speaks, in mg/dL and in mmol/L, with the formula shown so you can check any row yourself.
LPA to monthly salary calculator with in-hand breakdown
Enter the LPA from your offer letter and see the monthly gross, the estimated in-hand figure, and an annual breakdown that names every deduction between the two.
Bricks for wall calculator: count, cement bags and sand
Give the wall's three dimensions and get the bricks to order, the wastage allowance included, and the cement bags and sand that the same wall's mortar needs.
MPG to L/100km converter with US and UK gallon settings
One MPG figure in, one exact L/100km figure out, with the gallon type stated on the result instead of hidden in a settings menu.
Safe period calculator with full fertile window date ranges
Enter the first day of your last period and your shortest and longest cycles, and see the fertile window as an honest date range, never as one magic date.
Data usage calculator: GB per month for streaming and calls
Pick your activities and hours, and get a monthly GB figure you can hold against a real data package before you pay for it.
Umrah cost calculator with a full line by line PKR budget
One honest total for your family's trip, with every line visible and every price changeable, instead of a single package number you cannot question.
Trees per acre calculator for orchard spacing and counts
Enter your land size and your spacing, and get the tree count before you order seedlings or sign a nursery bill.
Rent split calculator: split rent by room size or income
Enter one rent and get each person's exact share, split equally, by room size, or by income.
Home load calculator: watts, daily units and solar size
List your appliances and learn your total load, your daily units, and which UPS, generator and solar band fits your home.
Hair transplant cost calculator: grafts, prices by country
Pick your hair loss stage and a country and see the graft range and cost range before you talk to any clinic.
Video file size calculator: from bitrate and duration to GB
Enter a duration and a resolution and get the file size in MB and GB before you record, export or upload.
Helmet size calculator: cm to motorcycle and cricket sizes
Measure your head once and get the right size label for motorcycle, bicycle and cricket helmets, each from its own bands.
About this site
My name is Talha Kayani, and I own this website. I developed ti-84calculator.com myself, and I still maintain it personally. The site began with one online TI-84 calculator for students and has grown into a tools blog where every calculator exists for one reason: I needed the tool, I searched for it, and what I found was broken, buried under pop-ups, or simply wrong. I brought Salma Tahira on board as content reviewer so that a second human checks every formula, figure and sentence before a page earns its place here.