Waist and hip circumference
Waist controls the top opening and waistband. Hip controls the widest lower-body area and affects the side seam, crotch curve, and ease through the seat.
Sewing pattern guide
Pants measurements guide
Basic pants patterns depend on a small set of measurements that must work together. This guide explains what each measurement controls and what to verify after generation.
Pants are the most measurement-sensitive garment the generator drafts. A skirt hangs from the waist and forgives a centimetre here or there; a pants block wraps the body in three dimensions, and the crotch curve in particular is calculated from values you cannot easily eyeball. When the waist, hips, crotch depth, and leg lengths are taken correctly, the generated block needs only minor fitting. When one of them is off, you get the classic trouser complaints — a crotch that pulls when you sit, folds sagging under the seat, or legs that twist around the ankle.
This guide covers every measurement the pants generator asks for: waist, hips, rise (crotch depth), outseam, inseam, knee, and hem circumference. For each one you will find the exact body landmark, the tape position, and the check that catches the most common error before it reaches the pattern.
You will need a flexible tape measure, a piece of narrow elastic to mark the natural waist, a flat hard chair for the crotch depth, and ideally a pair of pants that already fit you well. Measure in underwear or thin leggings — never over jeans — and enter all values in centimetres.
Use this guide
Related pattern templates
Open a matching generator after reviewing the guide, then preview the calculated draft before export.
Generator
Basic pants pattern
Create front, back, waistband, crotch, inseam, outseam, and hem guides.
GeneratorBasic shorts pattern
Generate a shortened pants-based block with thigh opening and hem checks.
GuideSeam and hem allowances
Review solid lines, dashed cutting lines, seam allowance, and larger hem allowance.
Rise and crotch depth
Rise defines how high the pants sit from crotch to waist. If rise is too short, the garment pulls vertically; if it is too long, extra fabric appears below the seat.
Inseam and outseam
Inseam runs from crotch to hem along the inner leg. Outseam runs from waist to hem along the side. These two values define overall leg length and help balance the crotch position.
Knee and hem width
Knee and hem settings control the leg silhouette. A narrow hem creates a tapered look, while a wider hem produces relaxed or wide-leg pants.
Front and back darts
Darts remove waist excess while preserving room at the hip. A back dart is common; a front dart can be useful when the waist is much smaller than the hip.
Wearing ease
Ease is extra space beyond body measurements. Woven pants usually need enough ease for sitting, walking, and fabric behavior.
Before cutting fabric
After generating the pants block, compare the front and back inseam lengths, side seams, waistline, waistband length, hem allowance, and print scale. The generated file is a drafting guide and may still need fitting corrections.
Step by step
How to take each pants measurement
Take the measurements in this order. The elastic tied in the first step anchors the waist, crotch depth, and outseam, so leave it in place until you are done. Stand relaxed with weight on both feet, and read the tape at normal exhale.
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01
Mark your natural waist with elastic
Tie narrow elastic around your middle and bend gently side to side until it settles into the crease of your natural waist — the narrowest point, usually just above the navel. Even if you plan a mid-rise or low-rise style, measure from the natural waist: the generator drafts from this reference level, and lowering the waistline is a controlled pattern change, not a measuring change.
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02
Measure the waist
Run the tape around the body exactly where the elastic sits, parallel to the floor, snug but not compressing — one finger should slide underneath. Do not pull your stomach in; pants drafted to a held-in waist dig in the moment you relax. Read the value at a normal exhale.
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03
Measure the hips at the fullest point
Slide the tape up and down between the waist and mid-thigh, over the widest part of the seat, and take the largest reading — typically 18–23 cm below the natural waist. Check in a mirror that the tape stays parallel to the floor all the way around; a tape that dips at the back can cost 2–3 cm and produce a block that strains across the seat.
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04
Measure crotch depth sitting on a hard chair
Sit upright on a flat, hard chair — not a sofa. Place a ruler or the tape vertically at your side, and measure straight down from the elastic at your side waist to the surface of the chair. This vertical distance is the crotch depth (rise) the generator uses to set the crotch line. Sit tall without slouching: rounding your back shortens the reading by 1–2 cm and drafts a crotch that cuts in.
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05
Measure the inseam on well-fitting pants
The inseam runs from the crotch point to the hem along the inner leg. On your own body this is awkward to take accurately, so use a pair of pants that fit you well: lay them flat, smooth the inner leg seam, and measure it from the crotch intersection to the hem edge. If you must measure on the body, stand straight and have someone run the tape from the crotch down the inner leg to the ankle bone or your chosen finished length.
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06
Measure the outseam
Along the side of the body, measure from the elastic at your natural waist straight down to where you want the hem to end — the ankle bone for full length, higher for cropped styles. Wear the shoes you plan to wear with the pants. As a consistency check, outseam minus inseam should land close to your crotch depth; if the difference is off by more than about 2 cm, re-measure all three.
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07
Measure knee and decide the hem width
For the knee, measure around the leg at the middle of the kneecap, standing with the leg straight and relaxed. The hem circumference is a design choice rather than a body measurement: measure the leg opening of pants whose silhouette you like, or start from roughly 40–44 cm for a straight leg, 34–38 cm for a tapered leg, and 50 cm or more for wide-leg styles.
Typical measurement ranges
Use this table to sanity-check your readings, not to replace them. The crotch depth column is the sitting measurement described above — from the side waist to the chair surface. If your value falls far outside the range for your waist and hip combination, re-measure before generating.
| Reference size | Waist (cm) | Hips (cm) | Crotch depth, sitting (cm) |
|---|---|---|---|
| EU 36 | 64–68 | 90–94 | 25–27 |
| EU 38 | 68–72 | 94–98 | 26–28 |
| EU 40 | 72–77 | 98–102 | 27–29 |
| EU 42 | 77–82 | 102–106 | 28–30 |
| EU 44 | 82–88 | 106–111 | 29–31 |
| EU 46 | 88–94 | 111–116 | 30–32 |
Crotch depth varies more between individual bodies than any circumference — two people with identical hips can differ by 4 cm. That is exactly why the generator asks for your measured value instead of deriving it from a size.
Common measuring mistakes
Measuring crotch depth standing
Wrapping the tape from the front waist through the legs to the back waist gives the total crotch length — a different measurement that the basic block does not ask for. The crotch depth the generator needs is vertical: side waist to chair surface, taken sitting. Measured standing or as a wrap, the value comes out several centimetres off and the crotch line lands in the wrong place.
Slouching during the crotch depth measurement
Sitting with a rounded back or on a soft cushion shortens the reading. Sit on a hard flat chair, spine tall, thighs horizontal, and keep the ruler vertical against your side — not angled toward the front of the body.
Measuring the inseam on your own bare leg
Holding the tape at your own crotch point while reading the value at the ankle almost guarantees an error of 2–4 cm. Measure a well-fitting pair of pants laid flat instead, or ask someone to help. The inseam sets the knee position too, so an error here shifts the whole leg shape.
Confusing rise with crotch depth
Ready-to-wear listings often quote the front rise — waistband top to crotch seam along the front of the garment, which includes ease and the waistband. The generator's rise input is the body's crotch depth. Entering a garment's front rise typically adds 2–3 cm and produces a saggy, low-hanging crotch.
Measuring over clothing or after a meal
Jeans and belts add 2–4 cm at the waist and distort the hip line; a full stomach changes the waist reading noticeably. Measure in underwear or one thin layer, at a normal time of day, with empty pockets.
Ignoring the outseam–inseam cross-check
Outseam, inseam, and crotch depth are geometrically linked: outseam ≈ inseam + crotch depth. If your three values do not roughly agree, at least one is wrong — and the generated block will inherit the contradiction as a twisted or off-balance leg. Always run this check before generating.
From measurements to pants that fit
Crotch depth drives sitting comfort
Too long a crotch depth drops the crotch of the pants below your body: horizontal folds collect under the seat and the inner thighs chafe against loose fabric. Too short, and the pants pull down at the waistband and cut in when you sit. If a previous pair showed one of these symptoms, adjust the entered value by 1–1.5 cm in the corresponding direction rather than guessing larger changes.
Ease for woven versus stretch fabric
For non-stretch wovens, plan roughly 2–4 cm of ease at the hips for a fitted straight leg and 4–8 cm for relaxed and wide-leg silhouettes; the presets give working starting points. For fabrics with 2–3% elastane you can reduce hip ease toward 1–2 cm, but never draft woven pants to negative ease — unlike knits, they cannot recover.
Sew a muslin before cutting good fabric
A pants muslin from old sheeting takes an evening and answers the questions no table can: sit, squat, and climb a step in it. Look at where drag lines point — folds radiating from the crotch point diagnose depth and curve issues far more precisely than standing measurements. Transfer corrections to your entered values and regenerate.
Balance the knee and hem taper
A hem much narrower than the knee creates a strong taper that can catch on the calf when walking; keep the hem within about 6 cm of the knee value for a comfortable tapered leg. For cropped lengths, remember the hem sits at a wider part of the leg — check the calf circumference at your chosen length before committing to a narrow opening.
Frequently asked questions
Do I add seam and hem allowances to my measurements?
No. Enter body measurements only. The generator drafts the block and adds the seam and hem allowances you select as separate values, drawn as the dashed cutting line around each piece — the solid line is the sewing line.
What is the difference between rise and crotch depth?
In this generator they refer to the same input: the vertical distance from your natural waist to the chair surface, measured sitting. It is not the garment rise printed on ready-to-wear labels, and not the full crotch length measured through the legs. When in doubt, take the sitting measurement described in the steps above.
My outseam minus inseam doesn't equal my crotch depth. Which is wrong?
Most often the inseam, because it is the hardest to take on the body. Re-measure it on a well-fitting pair of pants laid flat. If the mismatch persists, re-take the crotch depth sitting tall on a hard chair — slouching is the second most common culprit.
How do I verify the printed pattern is at the correct scale?
Every sheet includes a 5 × 5 cm test square. Print at 100% with 'fit to page' disabled, measure the square with a ruler, and only assemble and cut once it is exact. This applies to the A4 tiled PDF and the copyshop PDF alike; the SVG export can be checked the same way after plotting.
Can I use these measurements for both pants and shorts?
Yes — waist, hips, crotch depth, and outseam logic are identical. Shorts replace the knee measurement with a thigh circumference and use a much shorter inseam, so read the shorts measurements guide for the length and hem-width decisions specific to short inseams.