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Calculators, converters, PDF, text, images and much more — each with its own page. Type your data and get the result right here, with no sign-up and without your data leaving your device. Need them in your own app? The same tools are available by API.
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🎧 Audio & VoiceFree
Calculate speaking rate in words per minute
450 words spoken in 180 seconds is 150 words per minute, right inside the typical 110 to 160 range.
M
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🎓 EducationFree
Classify a learning objective by Bloom's Taxonomy level
The objective “Compare renewable and nonrenewable energy sources” starts with compare, which maps to the analyze level of revised Bloom's Taxonomy.
M
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🎓 EducationFree
Check citation format consistency
Of three references where two use periods and one uses commas, the comma entry is flagged with its reason.
M
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🎓 EducationFree
Select a report card comment template by subject and performance
Pick strength and science and you get a comment on understanding scientific concepts and using evidence to explain observations.
R
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🎓 EducationFree
Calculate weighted semester grade from category scores
With 92 in homework, 84 in quizzes, 88 in exams and 100 in participation, weighted 25, 15, 50 and 10 percent, your semester grade is 89.6%.
R
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🎓 EducationFree
Rank a vocabulary list by word frequency for teaching priority
Put a lesson's word list in teaching order by frequency: with your reference table, “the” comes first, then “water”, “ecosystem” and “habitat”, and…
F
Runs in your browser
✍️ Text & AIFree
Detect overused words in text
Set a threshold of 0.08 on the sample paragraph and “really” (5 of 39 words) and “plan” (4) are flagged as overused, while common words such as “the” and “and”…
A
Runs in your browser
💰 Finance & moneyFree
Business name combinations generator
Three first words and three endings give 9 possible names; ask for 6 with the label spring-campaign and you get TrueLabs, BrightMarket and four more, in the…
R
Runs in your browser
💰 Finance & moneyFree
Hybrid work schedule calculator
Three office days a week over four weeks means 12 days in the office and 16 remote days out of 28, ready for commute planning, desk capacity or a team calendar.
M
Runs in your browser
💰 Finance & moneyFree
Build a Competitor Feature Comparison Matrix
Compare Acme, Bravo and Cobalt on three features and get one clean grid with each one's supported-feature count (2 for Acme, 2 for Bravo, 1 for Cobalt).
K
Runs in your browser
💰 Finance & moneyFree
Fill content calendar posting slots from a weekly frequency
Four pieces at three posts a week from 2026-08-03 land on August 3, 5, 7 and 10, in the order you set, with a week and slot number for each one.
K
Runs in your browser
💰 Finance & moneyFree
Customer satisfaction (CSAT) score calculator
Five ratings of 5, 4, 3, 5 and 2 on a 1-to-5 survey, with 4 as the start of satisfied, give a CSAT score of 60%: 3 satisfied customers and 2 not.
K
Runs in your browser
💰 Finance & moneyFree
Elevator Pitch Length Checker
A 150-word pitch at 130 words per minute takes about 69.23 seconds, 9.23 over a 60-second target, so you need to cut 20 words to fit. Free in your browser.
K
Runs in your browser
💰 Finance & moneyFree
Calculate email list growth rate and gross signup rate
A list that grows from 10,000 to 10,800 subscribers with 200 unsubscribes shows 8% net growth but a 10% gross signup rate, since 1,000 people joined.
B
Runs in your browser
💰 Finance & moneyFree
Calculate Employee Net Promoter Score
Six answers of 10, 9, 8, 7, 6 and 2 give two promoters, two passives and two detractors, 33.33% each, so the eNPS is 0.
F
Runs in your browser
💰 Finance & moneyFree
Job posting inclusive language checker
Check a short advert against three flagged terms and it finds 4 matches, from “Salesman” to “young”, each with its line, column and your chosen neutral wording.
F
Runs in your browser
💰 Finance & moneyFree
Meeting cost calculator by attendee salaries and duration
A 45-minute meeting with hourly rates of 80, 120 and 90 costs 217.50: 60, 90 and 67.5 per person. Each attendee's share is listed so you can weigh the meeting…
B
Runs in your browser
💰 Finance & moneyFree
Meeting room double booking checker
Planning from 09:00 to 10:30 and interviews from 10:00 to 11:00 clash between 10:00 and 10:30, while a review starting at 11:00 is fine.
K
Runs in your browser
💰 Finance & moneyFree
Average podcast downloads per episode calculator
8 episodes with 12,500 downloads between them average 1,562.5 downloads per episode. Use the same set of episodes and the same time window for both numbers so…
R
Runs in your browser
💰 Finance & moneyFree
Generate a press kit contents checklist
Choose the startup stage and you get a 10-item press kit checklist: the 7 standard pieces, from logo files to usage notes, plus a founder story, a traction…
K
Runs in your browser
💰 Finance & moneyFree
Allocate Presentation Time per Slide and Section
A 20-minute talk with 8 slides and section weights of 1, 3 and 1 gives the core argument 12:00 and each of its slides 3:00, while the opening and conclusion get…
B
Runs in your browser
💰 Finance & moneyFree
Software license seat utilization calculator
84 assigned seats out of 120 purchased licenses is 70% utilization, with 36 seats still available to assign.
B
Runs in your browser
💰 Finance & moneyFree
Calculate Net Promoter Score
Six ratings of 10, 9, 8, 7, 6 and 3 give two promoters, two passives and two detractors, so the NPS is 0.
F
Runs in your browser
💰 Finance & moneyFree
Calculate Survey Response Rate from Sent and Completed Surveys
236 completed surveys out of 800 sent is a 29.5% response rate. Enter the two counts from the same campaign and get the percentage at once, with checks that…
B
Runs in your browser
🏗️ Engineering & constructionFree
Calculate Concrete Volume Needed With Waste Allowance
A 12 by 10 foot slab 0.5 feet thick is 2.222222 cubic yards, and 2.444444 once a 10 % waste allowance is added.
K
Runs in your browser
🏗️ Engineering & constructionFree
Estimate decking boards needed from area, width, and gap
Twenty square metres of deck with 0.14 m boards and a 0.005 m gap need 138 boards. Enter your area, board width and spacing to get a whole-board count that…
B
Runs in your browser
🏗️ Engineering & constructionFree
Calculate fence post count and even spacing
A 30 foot run with posts no more than 8 feet apart needs 4 equal sections, 5 posts and an actual spacing of 7.5 feet.
F
Runs in your browser
🏗️ Engineering & constructionFree
Calculate gravel volume for a driveway and estimate its weight
120 square metres of driveway at a depth of 5 cm need 6 cubic metres of gravel, about 9.6 tonnes. Enter your area and finished depth to check a quote or a…
F
Runs in your browser
🏗️ Engineering & constructionFree
Calculate combined insulation R-value from multiple layers
Layers of R-0.45, R-13 and R-5 add up to R-18.45. List each layer's R-value in the same units to compare insulation stacks or check a renovation spec before you…
R
Runs in your browser
🏗️ Engineering & constructionFree
Estimate HVAC BTU needed for room size
A 300 square foot room with an 8 foot ceiling, average sun and 2 people needs about 6000 BTU per hour, half a ton of cooling.
B
Runs in your browser
🏗️ Engineering & constructionFree
Calculate wallpaper rolls needed with pattern-repeat waste
A 12 by 8 ft wall is 96 sq ft; with 10% pattern waste it needs 105.6 sq ft of coverage, so rolls covering 28 sq ft each mean buying 4.
R
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🖼️ ImagesFree
Check CMYK rich black vs registration black
Find out what kind of black you really have: C60 M40 Y40 K100 is a rich black with 240 % total ink and a moderate risk, while C0 M0 Y0 K100 is plain black.
K
Runs in your browser
🖼️ ImagesFree
Color blind safe palette checker
Test whether a chart palette survives red-green color blindness: with red, green, blue and yellow, green and yellow fall to a distance of 8.26 under protanopia…
R
Runs in your browser
🖼️ ImagesFree
Name a color scheme by mood
Give a color and get a mood name you can justify: #E85D3F reads as bold-passionate and warm, because its hue is 10.7°, saturation 78.6 % and lightness 57.8 %.
B
Runs in your browser
🖼️ ImagesFree
Estimate CMYK from a Pantone-style color name lookup
Pantone 186 C comes back as an estimate of cyan 2 %, magenta 100 %, yellow 85 % and black 6 %, marked as approximate and for screen previews only.
M
Runs in your browser
🖼️ ImagesFree
Seeded random color generator
Seed 2026 always gives #CFD7C2, and its nearest familiar name is silver (#C0C0C0). Give every record, user or build a stable accent color from an ID you already…
B
Runs in your browser
🏠 Home, food & hobbiesFree
Scale a cocktail recipe to any batch size
A one-glass recipe of 2 oz gin, 0.75 oz lemon juice and 0.5 oz syrup becomes 16, 6 and 4 oz for eight drinks.
R
Runs in your browser
🏠 Home, food & hobbiesFree
Estimate homebrew ABV from original and final gravity readings
An original gravity of 1.052 and a final gravity of 1.012 give a drop of 0.040 and about 5.25% alcohol by volume.
M
Runs in your browser
🏠 Home, food & hobbiesFree
Suggest a Wine Pairing Category for a Dish
Plainly cooked fish calls for a crisp dry white served well chilled: pick the main profile of your dish, red meat, seafood, spicy food or dessert, and get the…
K
Runs in your browser
💰 Finance & moneyFree
API cost per request estimator
On a plan that includes 100,000 calls, using 125,000 means 25,000 extra calls billed at the overage rate.
K
Runs in your browser
⚙️ Developer UtilitiesFree
Backup retention storage calculator with deduplication
Keeping 30 daily backups of 250 GB each needs 7,500 GB raw; with a 2.5:1 deduplication ratio that shrinks to 3,000 GB, or 3 TB, saving 4,500 GB.
F
Runs in your browser
💰 Finance & moneyFree
Cloud instance effective hourly cost and reserved breakeven calculator
Put a monthly cloud reservation and an hourly on-demand rate on the same footing: you get the reservation's effective hourly cost and its breakeven, such as 500…
B
Runs in your browser
⚙️ Developer UtilitiesFree
Log retention storage calculator
Turn daily log volume and a retention period into the storage you need: 250 GB a day kept for 30 days is 7,500 GB raw, and at a 0.4 compression ratio it shrinks…
M
Runs in your browser
💰 Finance & moneyFree
SLA uptime credit calculator
Turn a month's measured uptime into the service credit you are owed: at 99.5 % uptime, a 99 to 99.9 % tier worth 10 % turns an eligible bill of 2500 into a…
R
Runs in your browser
📄 Documents & PDFFree
Business card bleed calculator
A 3.5 by 2 inch card with a 0.125-inch bleed needs artwork of 3.75 by 2.25 inches, with text kept inside 3.25 by 1.75.
F
Runs in your browser
📄 Documents & PDFFree
Standard envelope size lookup
A #10 envelope measures 4.125 by 9.5 inches, or 104.775 by 241.3 mm, the usual size for business letters folded into thirds.
B
Runs in your browser
📄 Documents & PDFFree
Label sheet grid calculator
On a 210 × 297 sheet, labels of 63.5 × 38.1 with margins of 6 and 10 and gaps of 3 and 2 form 3 columns by 6 rows, 18 labels in all.
K
Runs in your browser
📄 Documents & PDFFree
Recommend CSS line height for a font size and content type
Body text at 16 px gets a line height of 1.5, or 24 px, while headings use 1.2 and captions 1.4: enter a font size and the kind of text, and copy a ready…
M
Runs in your browser
📄 Documents & PDFFree
Print bleed and safe margin calculator
An 8.5 × 11 in page with 0.125 in bleed needs an 8.75 × 11.25 in canvas, and a 0.25 in safe margin leaves an 8 × 10.5 in zone for text: enter trim size, bleed…
R
Runs in your browser
📄 Documents & PDFFree
Printer Cost per Page Calculator for Ink and Toner
A cartridge rated for 3000 pages spreads its price across those 3000 pages: enter what the ink or toner costs and its rated yield, and get the cost of each page…
F
Runs in your browser
📄 Documents & PDFFree
Optimal reading column width checker
Enter a 16 px font and a 560 px column and you get 70 characters per line, inside the 45 to 75 range that keeps long reading comfortable.
F
Runs in your browser
🔬 ScienceFree
Compost Carbon-to-Nitrogen Ratio Calculator
Three buckets of dry leaves at 60:1, one of cardboard at 350:1, two of grass clippings at 17:1 and one of kitchen scraps at 20:1 land above the 25:1 to 30:1…
R
Runs in your browser
🔬 ScienceFree
Estimate solar panels needed for your energy usage
A home using 30 kWh a day with panels that each make 1.8 kWh needs 17 panels, since 16 would give only 28.8 kWh.
K
Runs in your browser
⚙️ Developer UtilitiesFree
Build a Code 128 barcode payload and checksum
Check that a label value fits Code 128 Set B and get the symbol values a printer needs: KIT-128 starts with value 104 and its checksum value is 77.
R
Runs in your browser
⚙️ Developer UtilitiesFree
Convert Morse code to a timed light signal pattern
With a 100-millisecond unit, ... --- ... becomes 17 timed on and off steps: dots shine for 100 ms, dashes for 300 ms, and the whole distress signal lasts 2700…
F
Runs in your browser
⚙️ Developer UtilitiesFree
Build a vCard QR payload string
Ada Lovelace, her phone, email and company become one vCard 3.0 text that starts with BEGIN:VCARD and ends with END:VCARD, ready for any QR encoder.
F
Runs in your browser
⚙️ Developer UtilitiesFree
Build a WiFi QR payload string for WPA, WEP, or open networks
A network called Studio;WiFi is written as Studio\;WiFi inside the WiFi QR text, because a bare semicolon would cut the name short.
B
Runs in your browser
💰 Finance & moneyFree
Phone installment payoff calculator
A phone balance of 749.99 paid at 31.25 a month needs 24 more payments, the last one 31.24. See how many months are left and what clears the device today before…
M
Runs in your browser
💰 Finance & moneyFree
Compare streaming subscription total cost
Three streaming services that cost 48.49 a month together add up to 581.88 a year, and the priciest one alone accounts for 294 of it.
K
Runs in your browser
🏠 Home, food & hobbiesFree
Seeded bingo card generator
Seed 2026 with a 5 × 5 card and numbers 1 to 75 always produces the same grid: 24 unique numbers around an open center square.
R
Runs in your browser
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1
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Create an account with your email and add balance when you need it. No subscription, no sales call.
2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
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No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.
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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
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The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
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Top up your balance and spend it across web, API and the app. It never expires.