Age at Death Calculator
Calculate a person's age at death in years, months, and days from their birth date and death date. The result uses calendar dates and does not infer a cause of death or life expectancy.
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Calculators
Calculators
Decision-support tools for sizing, cost, capacity, runtime, ownership, and other practical planning questions.
Age in Years Calculator
Calculate the elapsed age in completed years from a birth date and an as-of date using a 365-day year. This simple estimate does not account for leap years or exact calendar anniversaries.
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Ancestor Birth Year Gap Calculator
Calculate the difference in years between two recorded birth years to help compare dates in a family tree. Enter the earlier birth year and the later birth year.
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Audiobook Speed Calculator
Estimate how many hours an audiobook will take to listen to at a selected playback speed.
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Bible Reading Plan Calculator
Estimate the average number of Bible chapters to read in each planned session by dividing the chapters remaining by your planned reading sessions. This is a steady-pace estimate and does not assign passages to dates.
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Book Printing Cost Calculator
Estimate a print run's total and per-copy cost from setup, quantity, page count, and binding. This planning model uses your supplied rates and a fixed setup amount; it excludes shipping, taxes, and other charges unless you include them in your inputs.
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Book Royalty Calculator
Estimate book royalties from copies sold, list price, and your royalty rate. This simple estimate does not account for contract-specific deductions or terms.
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Book Spine Width Calculator
Estimate a book spine width in millimeters from the number of sheets, measured paper caliper, and a binding allowance. This simple worksheet estimate may differ from printer specifications.
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Book Weight Calculator
Estimate the total weight of a group of books from their individual weights and quantities. Enter weights in grams and get the combined weight in kilograms.
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Bookshelf Spacing Calculator
Estimate evenly spaced shelf openings from the inside height of a bookcase, the number of openings, and the shelf thickness. The result is the clear vertical space available in each opening when the top, bottom, and shelves use the same thickness.
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Crop Factor Calculator
Calculate a camera sensor's crop factor by comparing its diagonal measurement with the 35 mm full-frame sensor diagonal. Enter both measurements in the same unit.
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DNA Percentage Calculator
Calculate what percentage of a tested person's total DNA is represented by a shared DNA amount. Enter both amounts in the same unit, such as centimorgans (cM).
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Equivalent Focal Length Calculator
Convert a lens's actual focal length to its 35 mm equivalent using the camera sensor crop factor. The result describes angle-of-view equivalence, not a change in the lens's physical focal length.
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Exposure Value (EV) Calculator
Calculate the exposure value from aperture, shutter speed, and ISO, or use the displayed EV100 equivalent to compare camera settings at the standard ISO 100 reference.
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Family Archive Box Capacity Calculator
Estimate how many boxes fit on a shelf by comparing the shelf's usable width and depth with each box's footprint. The estimate assumes a single layer of uniformly sized boxes and does not account for clearances or obstacles.
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Family Archive Cataloging Time Calculator
Estimate cataloging time in minutes by multiplying the number of family archive items by the average minutes spent cataloging each item. This estimate assumes a consistent average time per item.
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Family Archive Shelf Length Calculator
Estimate the shelf length needed for a row of archive boxes using the number of boxes, each box's width, and the gap between neighboring boxes. This assumes boxes sit side by side in one straight row and uses the same width and gap throughout.
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Family Archive Transcription Time Calculator
Estimate the minutes needed to transcribe pages from a family archive, including scheduled breaks.
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Family History Book Printing Cost Calculator
Estimate the total printing cost for a family history book from the number of copies, pages per copy, and printing cost per page. This simple estimate assumes a consistent per-page rate and does not include separate setup, binding, shipping, or design charges.
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Family Photo Print Cost Calculator
Estimate the total cost of printing family photos by multiplying the number of prints by the cost per print. Enter both values in prints and your chosen currency.
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Family Tree Branch Count Calculator
Estimate the theoretical number of ancestor positions across a selected number of generations, starting from one or more people. The calculation assumes each person has two parent positions in every generation and does not account for repeated ancestors or incomplete records.
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Family Tree Generation Count Calculator
Count the inclusive number of generations between two generation numbers in a family tree.
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Field of View Calculator
Estimate the horizontal scene width captured by a rectilinear lens from camera distance, sensor width, and focal length. The result is a linear width in the same units as distance, not an angular field of view.
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Focal Length Calculator
Estimate the thin-lens focal length from the distance between a subject and the lens and the distance between the lens and the image plane. This idealized calculation assumes distances are measured from the lens principal plane.
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Genealogy Archive Copy Cost Calculator
Estimate an archive copy order's cost from the number of pages, the price per page, and any fixed order fee. Enter amounts in the currency used by the archive. This estimate assumes one per-page rate and one fixed fee, with no taxes, shipping, or other charges unless included in the fee.
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Genealogy Archive Travel Budget Calculator
Estimate a round-trip genealogy archive visit's fuel and archive fees using your distance, fuel cost per kilometer, and expected archive fee.
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Genealogy Book Reading Time Calculator
Estimate the reading time for a genealogy book by multiplying its page count by your average minutes per page. The estimate assumes a steady pace across all pages.
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Genealogy DNA Segment Total Calculator
Estimate the combined centimorgan length of a set of DNA segments by multiplying their count by the average length per segment. This simple total supports organizing genealogy and archive research; it does not identify relationships or determine ancestry.
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Genealogy Document Digitizing Cost Calculator
Estimate the cost of digitizing genealogy documents from the number of pages, cost per page, and any one-time setup fee. Enter amounts in your chosen currency throughout.
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Genealogy Research Page Count Calculator
Estimate the number of pages you can review during genealogy research from your available reading time and reading speed.
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Genealogy Research Time Calculator
Estimate the time needed to review a set of genealogy records by multiplying the number of records by the average minutes spent reviewing each one.
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Genealogy Source Citation Count Calculator
Estimate the total number of source citations in a family tree by multiplying the average citations per person by the number of people included.
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Genealogy Source Review Time Calculator
Estimate the minutes needed to review a collection of genealogy sources and write notes for them.
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Generation Length Calculator
Estimate the average number of years between successive generations in a family line using the total years covered and the number of generational intervals.
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Hyperfocal Distance Calculator
Estimate hyperfocal distance in meters from focal length, aperture f-number, and a user-supplied circle of confusion using the Nikon glossary approximation.
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Image Aspect Ratio Calculator
Calculate an image's aspect ratio from its pixel width and height, and find a proportional dimension when resizing.
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Image File Size Calculator
Estimate an image's uncompressed pixel data size, then apply an assumed compression ratio to estimate its encoded file size. This is a planning estimate and does not inspect or encode an actual image.
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Library Late Fee Calculator
Estimate a library item's late fee by multiplying the library's stated daily fee by the number of overdue days. This simple estimate does not account for grace periods, caps, or other policy adjustments.
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Pages Per Day Calculator
Estimate how many pages you need to read each day to finish a book or reading assignment by your target date, using your current page and the total pages remaining.
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Pages to Words Converter
Estimate a document’s word count by multiplying its page count by the average words per page. Choose a layout preset or enter a custom density to reflect your formatting.
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Photo Print Width Calculator
Convert a photo's pixel width to an estimated print width in inches at a selected pixels-per-inch (PPI) setting. This calculation covers the horizontal dimension only.
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Photo Storage Capacity Calculator
Estimate how much storage your photo collection needs from the number of images and their average file size. The result uses decimal gigabytes and does not include video, backups, or extra working space.
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Pixel Density Calculator
Calculate a display's pixel density in pixels per inch (PPI) from its pixel dimensions and diagonal screen size.
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Pixels to Inches Converter
Convert a pixel measurement to inches using the image's pixels-per-inch (PPI) resolution.
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Reading Goal Calculator
Estimate the daily pages to read to finish a book by your target date, based on the pages remaining and days available.
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Reading Time Calculator
Estimate how many minutes it will take to read a passage based on its word count and your reading speed.
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Shutter Speed from Frame Rate and Angle
Calculate exposure time in milliseconds from a video frame rate and shutter angle using the standard rotary-shutter relationship.
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Study Time Calculator
Estimate the focused study hours needed to complete a reading or study plan from the amount of material, your pace, and time reserved for review.
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Words Per Minute Calculator
Calculate your reading pace in words per minute from the number of words read and the time spent reading.
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Words Per Page Estimator
Estimate how many pages a text will fill from its word count and chosen words-per-page layout assumption.
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